Development of an integrative simulation method to predict the microstructural influence on the mechanical behaviour of semi-crystalline thermoplastic parts
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Walter Michaeli
Abstract
The mechanical properties of injection moulded plastic parts depend on the morphology, the degree of crystallinity and the molecular orientation of the formed microstructure. In order to take the variation of the microstructure into account in a structural analysis, a novel multi-scale, integrated simulation approach is presented here. At first, a coupled mould filling and heat transfer analysis is achieved at the macroscale and its temperature field is transferred to the micromodel. Based on the concept of cellular automata, a 3-D microstructure evolution model is developed. It specifies the nucleation of the spherulite germs and describes their expansion rate. To evaluate the effective mechanical properties of the simulated microstructures, the homogenisation method is applied directly to the spherulites, assembled in few classes according to their crystallinity degree. These local properties are then introduced into a new multilinear material model for structural analysis of thermoplastics. Finally, the influence of the microstructure on macroscopic behaviour is outlined for a polypropylene tensile bar, extracted from an injection moulded plate.
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© 2012, Carl Hanser Verlag, München
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- DGM News
- DGM News
Articles in the same Issue
- Contents
- Contents
- Editorial
- Editorial January 2012
- Original Contributions
- High-strength aluminum-based light-weight materials for safety components – recent progress by microstructural refinement and particle reinforcement
- Microstructure – deformation relationships in fine grained high manganese TWIP steel – the role of local texture
- Microstructure of a eutectic NiAl—Mo alloy directionally solidified using an industrial scale and a laboratory scale Bridgman furnace
- Effect of Si addition on the oxidation resistance of Co–Re–Cr-alloys: Recent attainments in the development of novel alloys
- Corrosion behavior of silicon oxycarbide-based ceramic nanocomposites under hydrothermal conditions
- Thermal cycling damage evolution of a thermal barrier coating and the influence of substrate creep, interface roughness and pre-oxidation
- Influence of creep and cyclic oxidation in thermal barrier coatings
- Residual stress states as a result of bending and straightening processes of steels in different heat treatment conditions
- Residual stresses under quasi-static and cyclic loading in shot peened Inconel 718
- Investigation of the surface residual stresses in spray cooled induction hardened gearwheels
- Stress-gradient induced fatigue at ultra high frequencies in sub micron thin metal films
- Influence of graphite spherical size on fatigue behaviour and fracture toughness of ductile cast iron EN-GJS-400-18LT
- Failure behaviour of the superalloy MAR-M247 LC under LCF, HCF and combined LCF/HCF loading
- Measuring techniques for the very high cycle fatigue behaviour of high strength steel at ultrasonic frequencies
- Failure limits of continuous carbon fibre reinforced plastics loaded with fibre parallel compression
- Development of an integrative simulation method to predict the microstructural influence on the mechanical behaviour of semi-crystalline thermoplastic parts
- DGM News
- DGM News
