金属基复合材料的强度与损伤分析

STRENGTH AND DAMAGE ANALYSIS OF METAL MATRIX COMPOSITES

用细观计算力学的方法分析了金属基复合材料 (MMC)多重损伤与强度的关系 ,采用唯象的内聚力模型模拟纤维 /基体界面的脱粘和采用G T模型描述韧性基体的损伤 .并用上述模型分析了长纤维增强MMC在横向荷载作用下损伤演化的规律 ,讨论了不同界面性质与材料强度及损伤。

A computational micro mechanics approach is adopted here to investigate the tensile strength of metal matrix composites(MMC) with both interface and matrix damage. A phenomenological cohesive zone model is employed to simulate the damage along the fiber/matrix interface. The damage in matrix, characterized by void nucleation, growth, and coalescence, is described by the Gurson Tvergaard material model. These damage models are applied to a boundary value problem that involves a double periodic array of elastic continuous fibers in an elastic plastic matrix subjected to the transverse loads. The influence of the interface properties on the tensile strength and the damage evolutions of MMC is discussed in detail.