摘要
研究了弱界面长纤维增强脆性基复合材料在单轴拉伸荷载下的力学性能及其破裂机理和破坏过程。采用基于细观损伤力学基础上开发的针对材料破坏过程分析的MFPA2D数值模拟程序,考虑材料物理力学参数在细观尺度上的非均匀性,对复合材料的变形、损伤直至失稳破坏的全过程进行数值模拟。结果表明当脆性基体复合纤维后,复合材料的强度、刚度都随之提高,并随纤维的增加而增加;复合材料的韧性也大为增强,可观察到界面脱粘、裂纹偏折、纤维桥联和拔出等现象,并得到相应的声发射模拟结果。
The failure process and mechanism of a brittle composite matrix, reinforced with long fibers with weak interface, is studied. Heterogeneity is applied to each mechanical parameter in mesoscale. Then, MFPA2D, a numerical programme developed based on meso-damage mechanics, is adopted to simulate the whole failure process under uniaxial tensile load. From the simulation result, the fiber reinforcement with weak interface could bring out not only higher strength and stiffness but also higher toughness of the composite. Some important phenomena, such as the interface debonding and sliding, crack deflexion, fiber bridging and pulling out, and etc. have been successfully reproduced and revealed. Finally, the accompanied result of acoustic emission is also presented.
出处
《中山大学学报（自然科学版）》
CAS
CSCD
北大核心
2006年第1期46-49,共4页
Acta Scientiarum Naturalium Universitatis Sunyatseni
基金
广东省自然科学基金资助项目(05001885)
建设部科技基金资助项目(05-K4-4)
关键词
纤维增强
弱界面
复合材料
破坏过程
数值模拟
fiber reinforcement
weak interface
composite
failure process
numerical simulation
