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- 2018
含脆性界面相的颗粒增强金属基复合材料的损伤
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Abstract:
通过引入双夹杂模型，将传统增量损伤理论扩展应用到三相复合材料颗粒尺寸效应问题，同时提出一个可以研究颗粒增强金属基复合材料的弹塑性变形及渐进式脱黏损伤模型，该模型还可以研究含脆性界面相的颗粒增强金属基复合材料弹塑性损伤变形行为的颗粒尺寸效应。研究发现，包含各种不同颗粒尺寸的颗粒增强金属基复合材料的脱黏损伤按照颗粒尺寸从大到小的顺序先后发生，并且该模型与SiC/Al复合材料的试验结果比较一致。 A constitutive model of particulate reinforced composites (PRCs) which can describe the evolution of debonding damage, matrix plasticity and particle size effects on deformation and damage was developed. An incremental damage model of PRC based on Mori-Tanaka's mean field concept had been extended to three-phase composites for interpreting particle size effect. The interphase was perfectly incorporated into the present micromechanics model as a third phase with the help of double-inclusion model. Progressive damage was controlled by a critical energy criterion for particle-matrix interfacial separation. Based on the developed model, the influences of progressive debonding damage, particle size and interphase properties on the overall stress-strain response of PRC were discussed. Finally, the particle size effect on the mechanical behaviors of composites was clearly interpreted from the role of the interphase, which was different from all the existing researches. 国家自然科学基金（61303098）
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