金属基纤维增强复合材料浇铸过程的数值模拟

The Numerical Simulations of the Casting Process for Making Fiber-reinforced Metal Matrix Composite

研究了如何应用数值方法模拟用金属液浸润纤维预制模来制造金属基复合材料的过程。采用有限元方法研究了渗流、热传导、应力、应变的演变过程 ,推导了相应的有限元方程 ,编制了轴对称情形下的计算程序。通过对浇铸过程的数值模拟 ,研究了可控初边值条件对浇铸过程的影响及对铸件中合金基体最终残余应力及塑性应变的影响 ;分析了浇铸得以完成及减少残余应力、应变的条件 ;将计算结果与已有的相似实验结果进行了比较 。

The numerical simulations of the casting process for making metal matrix composite by infiltrating melting alloys into a fiber preform arestudied. The evaluation of the infiltration flow, the thermal conduction, the stress and strains of the matrix are studied with finite element method, and the corresponding finite element program for axi-symmetry condition is programmed. The influences of the controllable initial and boundary conditions on the casting process, residual stress and residual plastic strains, and selection of optimal technological parameters are researched. The reliability of the numerical simulation is analyzed by comparison between the calculated results andsimilar experimental data.[WT5HZ]