中文摘要：

通过结合Gologanu-Leblond—Devaux（GLD）微观损伤模型与Mori-Tanaka（M-T）均匀化方法，建立颗粒增强复合涂层材料损伤破坏的分析模型。将激光熔覆复合涂层制备过程中产生的微气孔、微裂纹等缺陷作为损伤模型的初始孔洞，通过数值模拟分析孔洞形状、尺寸、分布、颗粒密度以及颗粒损伤等对复合涂层拉伸应力应变曲线以及断裂韧性的影响。另外，将模型分析与前期的激光熔覆H13-TiC复合涂层单轴拉伸实验进行比较。结果显示，应力应变曲线理论预测与实验结果基本吻合，最大拉伸断裂应变则在一定的误差范围内。

英文摘要：

Combining a microscopic damage model based on the Gologanu-Leblond-Devaux constitutive behavior with Mori-Tanaka mean-field homogenization scheme, a ductile fracture mode/ is established, which can describe damage progress of the particle reinforced composites coatings. The numerical simulations of damage model accounting for the effects of initial void shape, void size, void volume and particle damage on tensile behavior of laser-processed composite coatings are carried out. In addition, the prediction of the integrated homogenization-damage model is compared with experimental results of laser-cladding H13-TiC composite coatings. The results show that the theoretical prediction and experimental results on uniaxial tension stress-strain curves match well, and the error of maximum fracture strain is in certain range.