Materials Modeling for Optimized Material Performance and Life Prediction-An Overview (Ⅱ)

X .J. Wu ； W. Wallace

《中國航空太空學會學刊》 35卷1期 (2003/03) Pp. 21-34

https://doi.org/10.6124/TAASRC.200303_35(1).03

並列摘要

Aerospace systems always demand lighter, stronger, tougher and more damage-tolerant materials for better performances. Because of their severe operating conditions (high stress, high temperature and corrosive environment, etc., often in combination) that vary from engines to airframes, aerospace materials unavoidably suffer multiple modes of damage in service. Therefore, insertion of materials into an aerospace system requires extensive characterization of their properties. The material characterization and its life assessment often cannot be accomplished alone through testing. Materials models are often needed to simulate material's behavior under complex loading conditions. Furthermore, physically based models can provide insight, and even quantitative analysis, for alloy/microstructural design for achieving optimized properties and reliable life prediction. In short, materials modeling can provide a cost-effective material life cycle management tool.
Part Ⅱ of this article presents an overview of the modeling work at IARNRC, aiming at better understanding the deformation and fracture processes in airframe materials where fatigue crack growth and corrosion are the major life limiting factors. In this respect, modeling work at IAR is currently active on the following topics:
• Modeling transgranular fatigue crack growth in polycrystalline/textured materials.
• Modeling precipitation in 7xxx series aluminum alloys for improved corrosion resistance.
• Higher-order theory for laminates: with consideration of interlaminar stresses.

並列關鍵字

Fatigue crack growth ； Retrogression and reaging ； Fiber-metal laminate ； Single crystals