论文部分内容阅读
采用随动硬化有限元模型,研究了三维碳纤维增强镁基复合材料(3D-Cf/Mg)基体热残余应力的大小、分布以及不同工艺处理对热残余应力的影响。同时,对复合材料进行了高、低温处理,利用XRD定性分析了处理前后复合材料基体热残余应力的变化。计算结果表明:经过-196℃低温处理后,复合材料基体的平均Mises热残余应力由169.06 MPa减小至55.29 MPa;高温处理后,基体平均热残余应力几乎不变。该结果与实验结果吻合,证明了低温处理能明显降低复合材料基体的热残余应力。
The dynamic residual stress of 3D-Cf / Mg matrix composites was studied by the follow-up hardening finite element model. The effects of different process treatments on thermal residual stress were studied. At the same time, the composite material was treated at high and low temperature, and the change of thermal residual stress of the composite matrix was qualitatively analyzed by XRD. The calculated results show that the average Mises thermal residual stress decreases from 169.06 MPa to 55.29 MPa after the low temperature treatment of -196 ℃, and the average thermal residual stress of the matrix changes little after high temperature treatment. The result is in good agreement with the experimental results, which shows that the low temperature treatment can significantly reduce the thermal residual stress of the composite matrix.