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通过试验及模拟对复合材料的轴向压缩失效过程进行了研究。试验中,采用高速摄像机对失效过程进行捕捉,并对最终破坏模式进行光学显微镜分析。基于纤维初始位错、纤维随机强度及基体Ducker-Prager塑性本构,通过有限元软件ABAQUS建立了复合材料轴向压缩的有限元模型,并对比分析剪切型及拉伸型两种不同初始位错模型的模拟结果。研究结果表明,复合材料轴向压缩包含弹性变形及塑性变形阶段,离散的纤维基体二维有限元模型能够有效模拟压缩的渐进损伤过程,且模拟结果与试验结果相吻合。复合材料轴向压缩强度是纤维初始位错及塑性基体剪切屈服共同作用的结果,其随着纤维初始位错幅值的减小、波长的增加及纤维体积分数的增加而增加。
The process of axial compression failure of composites was studied through experiments and simulations. In the experiment, the high-speed camera was used to capture the failure process and the final failure mode was analyzed by light microscopy. Based on the initial fiber dislocation, the random fiber strength and the Duchen-Prager plastic constitutive model, a finite element model of the axial compression of the composite was established by the finite element software ABAQUS. The two different initial positions The wrong model of the simulation results. The results show that the axial compression of the composites includes the stages of elastic deformation and plastic deformation. The discrete two-dimensional finite element model of fiber matrix can effectively simulate the progressive damage process of compression, and the simulation results are consistent with the experimental results. The axial compressive strength of composites is the result of initial dislocation of fiber and shear yield of plastic matrix, which increases with the decrease of initial dislocation amplitude, wavelength and fiber volume fraction.