Influence of Random Microstructure on Stress Concentrations in Functionally Graded Composites

研究了随机微结构对功能梯度材料（FGM）中热弹性应力集中的影响。将微力学模型（即广义单元法）与随机有限元方法相结合，采用了移动窗口技术。这样的公式可以提取局部应力集中对损伤现象的影响，这与材料特性的局部变化有关。该技术的发展允许对材料微观结构进行定制，从而在高热梯度下获得优异的fgm性能。＊＊＊

9812992 Graham The influence of random microstructures on thermoelastic stress concentrations in Functionally Graded Materials (FGM) is examined. A moving-window technique is used whereby the micromechanics model, known as the generalized method of cells, is used in combination with stochastic finite element methods. Such formulations allow to pick up the effect of local stress concentrations, that are linked to local variations in material properties, on damage phenomena. The developments allow the tailoring of material microstructure to obtain a superior performance of the FGMs under high thermal gradients. ***