Detection of interfacial debonding in epoxy resin-bonded lead-steel structure using laser ultrasonics
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Guangkai Sun
, Daoming Qu and Zhenggan Zhou
Abstract
The epoxy resin-bonded lead-steel structures are widely used in nuclear industry for the protection of intense radiation, and the accurate detection of the interfacial debonding is very important. This paper studies the detection of interfacial debonding in the epoxy resin-bonded lead-steel structure using laser ultrasonic method. Two-dimensional finite element method is used to simulate the propagation of laser generated ultrasonic waves in lead-steel bonded structure and the interaction with interfacial debonding. The wave reflection and the attenuation occurred at the good bonding interface and the debonding interface are clearly shown. The reflection and attenuation of laser ultrasonic induced by the interfacial debonding are analyzed theoretically and experimentally, and the feature signals for the characterization of interfacial debonding are extracted. The appropriate wave frequency and measurement position are analyzed. The C-scan image of the specimen is obtained using the laser ultrasonic method. The results show that the laser ultrasonic method is effective for the noncontact detection of interfacial debonding in epoxy resin-bonded lead-steel structure, and the interfacial debonding with a diameter larger than 4 mm can be imaged clearly with laser ultrasonic C-scan method.
Kurzfassung
Epoxidharzgeklebte Blei-Stahl-Strukturen werden breitflächig in der Nuklearindustrie zum Schutz gegen intensive Strahlung angewendet. Daher ist eine akkurate Detektion von Grenzflächenablösungen in diesem Bereich sehr wichtig. In der diesem Beitrag zugrundeliegenden Forschungsarbeit wurde die Grenzflächenablösung in epoxidharzgeklebten Blei-Stahl-Strukturen mittels des Laser-Ultraschall-Verfahrens untersucht. Hierzu wurde die zweidimensionale Finite Elemente Methode angewendet, um den Fortschritt der lasergenerierten Ultraschallwellen in der geklebten Blei-Stahl-Struktur zu simulieren, ebenso wie die entsprechende Wechselwirkung mit Grenzflächenablösungen. Die Wellenreflektion und die Abschwächung des Laserultraschalls infolge der Grenzflächenablösung wurden theoretisch und experimentell analysiert, und die kennzeichnenden Signale zur Charakterisierung von Grenzflächenablösungen wurden identifiziert. Auch die geeignete Wellenfrequenz und Messposition wurden analysiert. Das C-Scan-Bild der Proben wurde mittels des Laser-Ultraschallverfahrens ermittelt. Die Ergebnisse zeigen, dass das Laser-Ultraschall-Verfahren effektiv ist, um eine berührungslose Detektion der Grenzflächenablösung in epoxiydharzgeklebten Blei-Stahl-Strukturen zu detektieren, und dass eine Grenzflächenablösung mit einem Durchmesser von mehr als 4 mm deutlich mit dem Laser-Ultraschall-C-Scan-Verfahren abgebildet werden kann.
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© 2017, Carl Hanser Verlag, München
Articles in the same Issue
- Inhalt/Contents
- Contents
- Fachbeiträge/Technical Contributions
- Effect of contact pressure on multiaxial fretting fatigue behavior of Al-Zn-Mg alloy
- Effect of various initial concentrations of CTAB on the noncovalent modified graphene oxide (MGNO) structure and thermal stability
- Bauschinger effect at elevated temperatures in a 2024-T3 aluminum alloy for designing wind turbine components
- Effect of Ni interlayer on diffusion bonding of a W alloy and a Ta alloy
- Comparison of the welding behavior of P/M borated and I/M borated stainless steel
- Detection of interfacial debonding in epoxy resin-bonded lead-steel structure using laser ultrasonics
- Effects of deep cryo treatment of high speed steel on the turning process of a medium carbon steel
- Weldability of superalloys alloy 718 and ATI® 718Plus™ – A study performed by Varestraint testing
- Strength and mechanical response of C/C composite open-hole and bolted plates
- Pullout performance of modified threads in glass fiber reinforced plastic (GFRP) composites
- Physico-chemical characterization of slag waste from coal gasification syngas plants: Effect of the gasification temperature on slag waste as construction material
- Preparation, characterization and thermoelectric properties of a polyaniline matrix Ge0.94Pb0.01Bi0.05Te composite
- Surface roughness analysis of greater cutting depths during hard turning
- Properties of fine soils contaminated with gas oil
- Numerical calculation and stress analysis of crack evolution in coal with a central hole under nonuniform load
Articles in the same Issue
- Inhalt/Contents
- Contents
- Fachbeiträge/Technical Contributions
- Effect of contact pressure on multiaxial fretting fatigue behavior of Al-Zn-Mg alloy
- Effect of various initial concentrations of CTAB on the noncovalent modified graphene oxide (MGNO) structure and thermal stability
- Bauschinger effect at elevated temperatures in a 2024-T3 aluminum alloy for designing wind turbine components
- Effect of Ni interlayer on diffusion bonding of a W alloy and a Ta alloy
- Comparison of the welding behavior of P/M borated and I/M borated stainless steel
- Detection of interfacial debonding in epoxy resin-bonded lead-steel structure using laser ultrasonics
- Effects of deep cryo treatment of high speed steel on the turning process of a medium carbon steel
- Weldability of superalloys alloy 718 and ATI® 718Plus™ – A study performed by Varestraint testing
- Strength and mechanical response of C/C composite open-hole and bolted plates
- Pullout performance of modified threads in glass fiber reinforced plastic (GFRP) composites
- Physico-chemical characterization of slag waste from coal gasification syngas plants: Effect of the gasification temperature on slag waste as construction material
- Preparation, characterization and thermoelectric properties of a polyaniline matrix Ge0.94Pb0.01Bi0.05Te composite
- Surface roughness analysis of greater cutting depths during hard turning
- Properties of fine soils contaminated with gas oil
- Numerical calculation and stress analysis of crack evolution in coal with a central hole under nonuniform load