Startseite Optimization and simulation analysis of structure parameters of OPCM ultrasonic longitudinal wave actuating element
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Optimization and simulation analysis of structure parameters of OPCM ultrasonic longitudinal wave actuating element

  • Ziping Wang EMAIL logo , Yangchun Ye , Zhujie Bao und Hao Ge
Veröffentlicht/Copyright: 26. März 2019
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Science and Engineering of Composite Materials
Aus der Zeitschrift Science and Engineering of Composite Materials Band 26 Heft 1

Abstract

The force-electric coupling relationship of the mechanical and electrical properties of piezoelectric composites has been the main factor in the research and development of piezoelectric composites in practical application. A novel orthotropic piezoelectric composite material (OPCM) element is studied in this paper. The properties of the piezoelectric phase and the polymer phase and the influence of the geometrical dimensions of the OPCM on the longitudinal wave drive element are analyzed from the perspective of mechanics and electric power, respectively, and the structural design is optimized. This provides a theoretical basis for the development of OPCM and of new longitudinal ultrasonic phased array actuators.

Keywords: actuator; parameter analysis; piezoelectric composite material; structure optimization

1 Introduction

At present, the key material for the conventional phased array transmitting and receiving devices is an ordinary piezoelectric ceramic material. There are many deficiencies in piezoelectric ceramics. The design performance of driving index is poor. Thickness direction and radial electromechanical coupling coefficient have little differences and easily lead to reduced efficiency of the transducer; the piezoelectric ceramic, because of brittleness, is so easily damaged during use, cutting, machining, and assembly and also easily broken under stress. The force and electrical characteristics of a single piezoelectric material are susceptible to temperature, magnetic field, and electric field, which make piezoelectric materials have limited transducer sensitivity and imaging accuracy in nondestructive testing applications of engineering structures [1, 2]. Therefore, how to research and analyze a novel piezoelectric composite transducer with directional transmitting and receiving functions is of great significance for improving detection sensitivity and signal-to-noise ratio in structural damage detection.

Piezoelectric composite materials have been developed for more than 30 years. In 1978, Newnham, who worked at the United States Pennsylvania State University Materials Laboratory [3], first proposed the concept of piezoelectric composite materials and began to study the application of piezoelectric composite materials in water, then successfully developed the 1-3-type piezoelectric composite in 1980 [4]. Based on piezoelectric sensors, the conclusion that piezoelectric composites outperform monolithic piezoelectric ceramics is demonstrated. In 1989, Chan and others studied the theoretical model of 1-3 piezoelectric composites and the relationship between the effective characteristic parameters and the volume ratio of piezoelectric phases [5]. In 1996, Safai et al. also studied 1-3 piezoelectric composite materials and confirmed that the main characteristic parameters of piezoelectric composites (such as flexibility, coupling with the host, etc.) were higher than those of monolithic piezoelectric ceramics [6]. From the 1990s to the early 21st century, T. Hauke of Germany, Hiroshi Takeuchi of Japan, and G. Hayward [7] and R. Hamilton [8] of the United Kingdom made corresponding transducers with piezoelectric composites. At present, piezoelectric composite materials have been widely used in engineering the structure of health-monitoring technology, which is one of the most widely used fields of intelligent composites. American scientist Bent proposed the concept of piezoelectric fiber composite materials and gradually extended to the field of composite materials in the drive and sensing performance test [9, 10, 11, 12]. However, when the piezoelectric fiber composite material is applied to the non-planar structure, the strain driven becomes non-directional (the induction of the vibration signal is also non-directional), and all the strain energy density becomes low. In order to overcome these shortcomings, in 1999, Ying Luo, who comes from Jiangsu University, proposed the concept of 1-1-type piezoelectric orthotropic sensor components with the use of piezoelectric orthotropic composite components of the sensor in the two-dimensional and three-dimensional stress field decomposition of the stress wave component. The results obtained by domestic and foreign counterparts were of widespread concern and praise [13, 14, 15]. In 2000, an orthotropic nature of the piezoelectric composite material was developed in the United States, at the Massachusetts Institute of Technology, at its smart materials and structural laboratory [16, 17]. The research and application of 1-3 piezoelectric composite have become the research of piezoelectric composite materials both at home and abroad [18, 19, 20]. And they rarely study the research and application of 1-1 type piezoelectric composite materials. In recent years, the author group who developed the 1-1-type orthotropic piezoelectric composite material (OPCM) sensor, which was first used for engineering structural damage identification active monitoring [21, 22, 23], had made an achievement. This group has developed an S-type piezoelectric micro-displacement amplifier actuator and micro-band orthogonal anisotropic – acoustic emission sensor [24], and upon verification, its drive performance was better than that of conventional PZT actuator.

Based on the force-electric coupling theory, an OPCM element with telescopic vibration is constructed. The influence of the characteristics of the phase material and the structure size on the performance of the OPFC drive element is analyzed by CONSOL finite element simulation platform, and its optimal parameters are obtained, which provide guidance for further research on the new ultrasonic phased array transducer.

2 The principle of piezoelectric actuator

The schematic of a 1-1-type piezoelectric composite is as shown in Figure 1. In piezoelectric composite materials using transverse piezoelectric effect, the direction of polarization of each piezoelectric plate is parallel to the direction of the applied electric field, and it is along the thickness direction of the piezoelectric composite. The coordinate axis z is consistent with the polarization direction of the piezoelectric phase, the x–y plane is perpendicular to the polarization direction, the electrode surface of the composite material is the x–y surface, and the PZT material is a transversely isotropic material.

Figure 1 1-1 OPCM longitudinal actuator element.
Figure 1

1-1 OPCM longitudinal actuator element.

When the piezoelectric element acts as an actuator, it works on the basis of the inverse piezoelectric effect and generates electric strain under the action of an external electric field. The piezoelectric effect is expressed by the inverse piezoelectric effect, and the applied electric field is in three directions. If the structure of the bonded piezoelectric element is in the 1–3 plane (x–z plane, consistent with the 1-1-type piezoelectric composite material), as shown in Figure 2, the single-sided adhesive form is adopted. In the figure, tb is the thickness of the elastic

Figure 2 The actuating model of piezoelectric material.
Figure 2

The actuating model of piezoelectric material.

structure, tz is the thickness of the adhesive layer, tc is the thickness of the piezoelectric actuator, le is the length of the piezoelectric actuator, and bb is the width of the elastic structure. When the OPCM element is used as an actuator, the static equilibrium equation of the actuator element can be expressed as follows:

(1)∂σo∂x−τptc=0

In the formula, σ0 and τp are the normal stress and shear stress of the actuator element, respectively.

The static balance equation of the elastic host component can be expressed as follows:

(2)∂σba∂x−bcbbtbτp=0

In the formula, bc is the drive element width.

The moment balance equation of a piezoelectric composite drive element can be expressed as follows:

(3)τpdxbo×12tb+dM=0

In the formula, b0 is the thickness of the adhesive layer.

The torque at point A can be expressed as follows:

(4)M=∫−12tb12tbσybbdy
(5)M=16bbtb 2(σbp−σbo)

In the formula, σbp and σboare the normal stresses of the coupling layer and the host component, respectively.

Substituting formula (5) with formula (3), the moment balance equation of the host component can be obtained:

(6)3bcbbtbτp+∂σbp∂x−∂σbo∂x=0

In this mechanical model, the stress-strain relationship in the piezoelectric composite actuator, the coupling layer, and the host structure can be expressed as follows:

(7)εo=∂uo∂x   εbp=∂ubp∂x  εbo=∂ubo∂x  rp=uo−ubptp

In the formula, ε0 and u0 are, respectively, the linear strain and displacement components of the actuator element; εbpand ubpare the linear strain and displacement components of the coupling layer; εbo  and uboare, respectively, the linear strain and displacement components of the host component, and rp is the shear strain.

The stress-strain relationship of piezoelectric composites can be obtained by the inverse piezoelectric equations:

(8)σo=Eo(εp−e31EcE3)

The stress-strain relationship in the host component elastic material can be expressed as follows:

(9)σbp=Ebεbp   σbo=Ebεbo  τp=Grp

In the formula, e31 is the piezoelectric strain constant in one direction; E0, Ec, and Eb are the elastic moduli of the host component, the piezoelectric material, and the coupling layer, respectively; E3 is the piezoelectric phase elastic modulus; and Gp is the shear modulus of the piezoelectric material.

Substituting formula (9) with formula (6), the following equations can be obtained:

(10)∂2εo∂x2−GpEototp(εo−εbp)=0
(11)∂2εbp∂x2−∂2εbo∂x2+3b0GpEbtbbbtp(εo−εbp)=0
(12)∂2εbp∂x2+boGpEbtbbbtp(εo−εbp)=0

It can be substituted by using the infinitude no dimension method:

(13)Γ2=ψpTp2(ψb+4ψp)  ψb=EbtbbbEotobo   ψp=GptpbpEotobo
(14)Tp=tpto/2x¯=xlp/2

The boundary conditions of differential equation (11) can be expressed as follows:

(15)ε(±1)=Λ=e31EpE3   εbp(±1)=0  εbo(±1)=0

In the formula, Λ is the induced strain of the composite. To solve the differential equations (15)

(16)εc(x¯)∧=4ψb+4+ψb(ψb+4)cosh(Γ)cosh(Γx¯)εcs(x¯)∧=4ψb+4+4(ψb+4)cosh(Γ)cosh(Γx¯)εco(x¯)∧=4ψb+4+1(ψb+4)cosh(Γ)cosh(Γx¯)
(17)τs∧(x¯)=bbtblcEbΓ2bcsinh(Γx¯)(ψb+4)cosh(Γ)

Formulas (16) and (17) are the strain distribution of the piezoelectric composite actuator and the elastic structure and the distribution of the shear stress of coupling layer, respectively.

3 Structural parameters optimization of OPCM element

3.1 Effect of piezoelectric phase material properties on the component performance

In the longitudinal wave actuator/sensor element structure of 1-1-type OPCM, the piezoelectric phase material played a leading role for the OPCM. Taking into account that the OPCM components require the best driving and sensing performance, piezoelectric phase materials and polymer phase materials were selected, which are the PZT-51 piezoelectric ceramic materials and DAD-40 epoxy resin conductive adhesive. The main parameters of the piezoelectric phase material include elastic modulus, Poisson’s ratio, dielectric constant, etc., and the material parameters are as shown in Table 1. The total thickness of the OPCM element is 3.1 mm, the length is 14 mm, the width is 1.5 mm, the thickness of the conductive adhesive is 0.1 mm; the DAD-40 type epoxy conductive adhesive (room-temperature shear strength is 14.7 Mpa, the volume resistivity is less than 1.0 × 10−3 Ω cm) and these materials were configured as a strip-shaped cross-over electrode. When the OPCM element is driven, the voltage applied in the z-direction is 10 V.

Table 1

The basic material parameter of PZT-51.

Density (kg/m3)Piezoelectric constant 10 − 12 C/NCompliance constant 10 − 12 m2/NPoisson ratioDielectric constant
ρd31d33d15S11ES33ES55Eμ12μ13ε33Tε11T
450 −1854006501519220.320.621002400

The section size of the piezoelectric phase material is 1.5 mm × 0.7 mm, and the section size of the polymer phase material is 1.5 mm × 0.1 mm. The model of OPCM longitudinal wave actuator element that was established after inputting the corresponding material parameters is as shown in Figure 3.

Figure 3 Finite model of OPCM longitude actuator element.
Figure 3

Finite model of OPCM longitude actuator element.

Figure 4 shows the stress distribution of the 1-1 longitudinal wave OPCM element under the action of electric displacement D = 140 C/m2. In the OPCM piezoelectric composites, the elastic modulus of the polymer phase material is much smaller than that of the piezoelectric phase material. When the piezoelectric composite is subjected to external stress, the stress acting on the polymer phase material will be transmitted to the piezoelectric phase material, resulting in a stress amplification effect on the piezoelectric phase material, that is, the stress-focus phenomenon. At the same time, the dielectric constant of the polymer phase is extremely low, which makes the overall dielectric constant of the piezoelectric composite decrease greatly. For these two reasons, the piezoelectric composition g of the piezoelectric composite is greatly improved. The addition of the polymer also improves the flexibility of the piezoelectric composite, resulting in a significant improvement in its comprehensive properties.

Figure 4 Charging initial electric displacement (D = 140 C/m2).
Figure 4

Charging initial electric displacement (D = 140 C/m2).

3.2 Effect of elastic modulus of piezoelectric phase on the performance of element

According to the constitutive relation of the superimposed piezoelectric composite, the piezoelectric elastic modulus E3 has a certain influence on the piezoelectric properties and mechanical properties of the whole piezoelectric composite. It is easy to find the effect law of E3 range from 6.8 × 109 to 8.2 × 109 on the driving performance of the OPCM element from Figure 5. With the increase of the elastic modulus, the strain of the OPCM element in the z-direction decreases, but the strain in the x-direction does not change much. For the same elastic modulus, when the applied voltage is 10 V, the strain in the z direction is significantly larger than that in the x direction, which also shows that the piezoelectric composite has obvious orthotropic component, and as the piezoelectric modulus increases, the strain tends to decrease for the same voltage applied.

Figure 5 Relationship between piezoelectric elastic modulus and strain of composite material (U = 10 V).
Figure 5

Relationship between piezoelectric elastic modulus and strain of composite material (U = 10 V).

3.3 Effect of dielectric constant of piezoelectric phase on component performance

As the dielectric constant of the polymer phase in the piezoelectric composite material is very low, the dielectric constant of the entire OPCM element is mainly determined in the piezoelectric phase. Figure 6 shows the effect of the dielectric constant of the piezoelectric phase on the driving performance of the composite. It can be seen that with the increase of the dielectric constant, the strain gradually increases, and the variation in the y direction is not significant. According to the electrostatic field formula and the orthogonal anisotropic, selecting the piezoelectric phase material with large dielectric constant can improve the actuating performance of the OPCM driving element.

Figure 6 Relationship between piezoelectric dielectric coefficient and strain of composite material.
Figure 6

Relationship between piezoelectric dielectric coefficient and strain of composite material.

3.4 Effect of Poisson’s ratio of piezoelectric phase on the performance of components

From the constitutive relation of 1-1-type piezoelectric composites, it can be seen that the Poisson’s ratio at the piezoelectric phase has certain influence on the piezoelectric properties and mechanical properties of OPCM, as shown in Figure 7. With the increase of the Poisson’s ratio of the piezoelectric phase material, the induction strain of the OPCM driving element is increasing, but the variation is not significant, which indicates that the piezoelectric material with high Poisson’s ratio is helpful to improve the deformation performance of the OPCM longitudinal wave drive element. For the same Poisson’s ratio, the strain of the OPCM element in z direction is 5.6 times the strain in the x direction, which also indicates that the piezoelectric composite structure has orthotropic properties.

Figure 7 Relationship between piezoelectric Poisson’s ratio and strain of composite material (U = 10 V).
Figure 7

Relationship between piezoelectric Poisson’s ratio and strain of composite material (U = 10 V).

3.5 Effect of elastic modulus of polymer phase on component performance

When the OPCM element is used as a longitudinal wave actuator, the piezoelectric phase material generates an induced strain under the action of an electric field, which is then transferred to the host component through the polymer phase material, so selecting the appropriate polymer phase material contributes to ensuring and improving the performance of the piezoelectric composites.

The influence of the elastic modulus of the polymer phase on the properties of the composite is as shown in Figure 8. The strain does not change much as the elastic modulus of the polymer increases. It is easy to enhance the stress-focus phenomenon of piezoelectric phase by choosing a low elastic modulus polymer phase material, thereby enhancing the overall performance of OPCM longitudinal wave drive components. Therefore, selecting the low elastic modulus of the polymer can improve the composite performance when designing and manufacturing.

Figure 8 Relationship between polymer phase elastic modulus and strain of composite material (U = 10 V).
Figure 8

Relationship between polymer phase elastic modulus and strain of composite material (U = 10 V).

3.6 Effect of Poisson’s ratio of polymer phase on component performance

The effect of Poisson’s ratio on the properties of piezoelectric composites is as shown in Figure 9. The Poisson’s ratio of polymer phase has little effect on the properties of the composites, and the tendency of strain to decrease is small. The strain in the x direction is 5.6 times the strain in the y direction, indicating that the OPCM element has obvious orthotropic properties. It also shows that, as the Poisson’s ratio increases, the polymer increases the stress or strain amplification of the piezoelectric composite.

Figure 9 Relationship between polymer phase Poisson’s ratio and strain of composite material (U = 10 V).
Figure 9

Relationship between polymer phase Poisson’s ratio and strain of composite material (U = 10 V).

4 Influence of geometric parameters on the performance of OPCM longitudinal wave actuating/sensing element

In addition to the material parameters on the performance of OPCM components, there are geometric structure parameters that also affect the performance of OPCM components by analyzing the different OPCM drive/sensor components aspect ratio and thickness and its impact on the performance.

4.1 Influence of piezoelectric phase to long ratio on orthotropic performance

When the OPCM element is driven, an electric field voltage of 10 V is applied in the direction of polarization of the piezoelectric phase material to extract the strain values in the x direction and the z direction, respectively. It can be seen from Figure 10 that increasing the aspect ratio of the piezoelectric phase material can increase the orthogonality ratio of the OPCM element. The polarization direction is in the z direction; the performance in the polarization direction and the performance in the other two directions are on the contrary, and just to meet the Poisson’s effect of the material, when the aspect ratio is 14, which is the orthotropic ratio to reach the maximum combined with the processing technology, we used the aspect ratio as the best study size.

Figure 10 The relationship between the aspect ratio and the orthotropic ratio.
Figure 10

The relationship between the aspect ratio and the orthotropic ratio.

4.2 Effect of thickness on orthotropic properties of composites

As shown in Figure 11, the thickness of the OPCM element changes its performance. When the thickness of the OPCM element with a length of 14 × 1 mm changes from 0.7 mm to 3.1 mm, the OPCM longitudinal wave drive element, the resonant frequency decreases rapidly. After 100 kHz, it tends to be gentle, and when combined with the test material in this experiment, it requires frequency analysis to select the four-layer piezoelectric film structure, which is more appropriate. Figure 12 shows the effect of the aspect ratio on the resonant frequency. It can be seen that when the aspect ratio is 2.1, the frequency is the largest, so the OPCM element structure of the frequency segment can be selected as an actuator.

Figure 11 Relationship between thickness and resonant frequency.
Figure 11

Relationship between thickness and resonant frequency.

Figure 12 Relationship between aspect ratio and resonant.
Figure 12

Relationship between aspect ratio and resonant.

The influence of the physical parameters and geometrical parameters on the driving performance of the OPCM element is analyzed. The optimal selection of PZT piezoelectric phase and polymer phase material and the OPCM element with the best thickness and aspect ratio for the experimental scheme are obtained. The OPCM components can produce directional stress wave signal and are conducive to the concentration of directional energy, reducing the side of the signal generated in the interference. The OPCM for the waveguide drive components, due to the existence of orthotropic properties in the x direction and y direction of the excitation voltage, is not consistent; if used for the development of ultrasonic phased

array actuator, the delay will occur with the wavefront shape change, because the formation of the wave front is calculated by the arc, and the OPCM waveguide excitation signal formed by the elliptical line is not conducive to the calculation of different material delay law. So for OPCM guided wave drive components for a single actuator within the ultrasonic guided wave detection, only the OPCM P-wave drive/sensing element is used in the ultrasonic phased array detection technique of the engineering structure, which enhances the effective signal of the sensitivity direction emission and reduces the direction of the sensitive direction (lateral) of the signal to stimulate, so as to improve the signal-to-noise ratio for the engineering structure of ultrasonic phased array technology and to solve the problem of lateral reflection of the interference.

5 Summary

The force-electric coupling relationship and mechanical and electrical properties of 1-1-type piezoelectric composites have been the main factors to study and develop the piezoelectric composite materials in practice. The finite element method is used to analyze the piezoelectric phase, the polymer phase, and the geometric parameters. The influence of OPCM component driving and sensing performance and the best materials and geometric parameters are obtained. Among the various factors that influence OPCM, the piezoelectric properties of piezoelectric composites are mainly affected by the piezoelectric phase and are also affected by the polymer phase to a certain extent, and its mechanical properties are greatly influenced by the polymer phase.

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Acknowledgments

The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was financially supported by the National Natural Science Foundation of China (11872191 and 11520101001), The Key R& D Plan of Jiangsu Province (BE2015138) and The Key R& D Plan of Zhenjiang city (GY2015054) and Jiangsu University Foundation (14JDG022).

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Received: 2017-12-02
Accepted: 2018-06-13
Published Online: 2019-03-26
Published in Print: 2019-01-28

© 2019 Wang et al., published by De Gruyter

This work is licensed under the Creative Commons Attribution 4.0 Public License.

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https://doi.org/10.1515/secm-2017-0394
Schlagwörter für diesen Artikel
actuator; parameter analysis; piezoelectric composite material; structure optimization
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  9. Investigation of wear behavior of nanoalumina and marble dust-reinforced dental composites
  10. Negative effect of clay fillers on the polyvinyl alcohol biodegradation: technical note
  11. Photocatalytic activity of Cu2O/ZnO nanocomposite for the decomposition of methyl orange under visible light irradiation
  12. Sub-surface mechanical properties and sub-surface creep behavior of wood-plastic composites reinforced by organoclay
  13. Surface integrity in wire-EDM tangential turning of in situ hybrid metal matrix composite A359/B4C/Al2O3
  14. The influence of the WC-Co composite microstructure model on stress field heterogeneity at the microstructure level: FEM based study
  15. Vibration-damping characterization of the basalt/epoxy composite laminates containing graphene nanopellets
  16. A review on nanocomposite hydrogels and their biomedical applications
  17. Optimization and simulation analysis of structure parameters of OPCM ultrasonic longitudinal wave actuating element
  18. Research Article
  19. Preparation of POSS-triol/wollastonite composite particles by Liquid phase mechanochemical method and its application in UV curable coatings
  20. Research on preload relaxation for composite pre-tightened tooth connections
  21. Dough moulding compound reinforced silicone rubber insulating composites using polymerized styrene butadiene rubber as a compatibilizer
  22. Hydration And Microstructure Of Astm Type I Cement Paste
  23. Effects of NiO content on the microstructure and mechanical properties of AgSnO2NiO composites
  24. Overall buckling behaviour of laminated CFRP tubes with off-axis ply orientation in axial compression
  25. UV sensing optode for composite materials environment monitoring
  26. On crushing characteristics of hybrid sandwich aluminum-cardboard panels reinforced with glass fiber composite rods
  27. Preparation and characterization of Ni-Cu composite nanoparticles for conductive paints
  28. A research on the preparation of oil-adsorbing hydrophobic porous resins by high internal phase emulsions (HIPEs) template
  29. Material characteristics of random glass-mat-reinforced thermoplastic under cryogenic thermal cycles
  30. Differentiation of non-black fillers in rubber composites using linear discriminant analysis of principal components
  31. Research Article
  32. Efficiency of TiO2 catalyst supported by modified waste fly ash during photodegradation of RR45 dye
  33. Synthesis and performance of polyurethane/silicon oxide nano-composite coatings
  34. Study on preparation of magnesium-rich composite coating and performance enhancement by graft modification of epoxy resin
  35. Research Article
  36. Mechanical and wear properties of polyetheretherketone composites filled with basalt fibres
  37. Mechanical Properties of Al 25 wt.% Cu Functionally Graded Material
  38. Research Article
  39. Weight reduction of a carbon fibre composite wheel
  40. Synthesis, electrical properties, and kinetic thermal analysis of polyaniline/ polyvinyl alcohol - magnetite nanocomposites film
  41. Seismic Behaviour of TRC-Strengthened RC Columns under Different Constraint Conditions
  42. Characterization of neat and modified asphalt binders and mixtures in relation to permanent deformation
  43. Microstructures, interface structure and room temperature tensile properties of magnesium materials reinforced by high content submicron SiCp
  44. Research Article
  45. Effect of Cutting Temperature on Bending Properties of Carbon Fibre Reinforced Plastics
  46. Mechanical and tribological properties of B-C-N coatings sliding against different wood balls
  47. Thermal conductivity of unidirectional composites consisting of randomly dispersed glass fibers and temperature-dependent polyethylene matrix
  48. Effects of Waste Eggshells addition on Microstructures, Mechanical and Tribological Properties of Green Metal Matrix Composite
  49. Investigation of porosity effect on flexural analysis of doubly curved FGM conoids
  50. Review Article
  51. Utilization of tailings in cement and concrete: A review
  52. Research Article
  53. Equivalent stiffness prediction and global buckling analysis using refined analytical model of composite laminated box beam
  54. Mechanochemical synthesis of zincite doped with cadmium in various amounts
  55. Size-dependent vibration analysis of graphene-PMMA lamina based on non-classical continuum theory
  56. Automated, Quality Assured and High Volume Oriented Production of Fiber Metal Laminates (FML) for the Next Generation of Passenger Aircraft Fuselage Shells
  57. Research Article
  58. An investigation of the stitching effect on single lap shear joints in laminated composites
  59. The low-velocity impact and compression after impact (CAI) behavior of foam core sandwich panels with shape memory alloy hybrid face-sheets
  60. Effect of granulometric distribution on electromagnetic shielding effectiveness for polymeric composite based on natural graphite
  61. The enhancement of filament winding in marine launching rubber gasbag
  62. Research on ELID Grinding Mechanism and Process Parameter Optimization of Aluminum-Based Diamond Composites for Electronic Packaging
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Heruntergeladen am 10.9.2025 von https://www.degruyterbrill.com/document/doi/10.1515/secm-2017-0394/html
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