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Local and global measures of the fracture toughness of metal matrix composites

机译：金属基复合材料断裂韧性的局部和整体测量

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摘要

The fracture behavior of two metal matrix composites (MMCs) at different aging conditions is investigated both at the global and local level. The study is focused on the processes of void initiation near the crack tip by either particle fracture or particle/matrix decohesion, and on fracture initiation. The global fracture properties are determined by conventional fracture mechanics tests. The local conditions for void and fracture initiation are determined using fractographic analyses and subsequent analytical computations, based on the HRR-field equations, mean-field theory, and a simple analytical model from literature. The correlation between the global and local fracture properties is studied. The applicability of existing models to predict the fracture toughness of MMCs is discussed. The results of the analyses suggest that the maximum principal stresses in the particles at the moment of void initiation are not constant, but exhibit a dependency on the composite yield strength.
机译：研究了两种金属基复合材料（MMC）在不同时效条件下的断裂行为。该研究集中在裂纹尖端附近由颗粒断裂或颗粒/基体脱粘引起的空隙引发过程，以及断裂引发。整体断裂性能由常规断裂力学测试确定。基于HRR场方程，平均场理论和文献中的简单分析模型，使用分形分析和后续分析计算确定了孔隙和裂缝萌生的局部条件。研究了整体和局部断裂特性之间的相关性。讨论了现有模型在预测MMC断裂韧性方面的适用性。分析结果表明，空隙引发时颗粒中的最大主应力不是恒定的，而是表现出对复合屈服强度的依赖性。

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