Process-induced Thermal Deformation Behavior and Thermal Residual Stress Distribution in CF/Al Composites [CF/Al复合材料制备热变形行为与热残余应力分布]

作者：Zhang Y.; Yan Y.; Wang Z.^*; Cai C.; Xu Z.; Yu H.

来源：Rare Metal Materials and Engineering, 2022, 51(2): 661-668.

• Aluminum matrix composites
• Damage
• Micromechanics
• Thermal deformation
• Thermal residual stress

The thermal deformation behavior and thermal residual stress distribution in continuous carbon fiber reinforced aluminum matrix composites (CF/Al composites), which were prepared by the vacuum pressure infiltration process, were studied by numerical simulation and thermal expansion test method. The results show that the transverse thermal strain of the composite is much larger than the axial thermal strain, and the thermal expansion behavior is transversely isotropic. The RVE model with random fiber arrangement can accurately predict the axial and transverse thermal deformation behavior curves of the composite. In the as-prepared composite, the fiber and matrix alloy are in compressive and tensile stress state, respectively. The transverse residual stresses of the matrix alloy and fiber are less than their axial residual stresses. The residual stress state in both matrix alloy and fiber shows the transverse isotropic characteristic. Under the action of axial residual tensile stress, the matrix alloy is damaged in varying degrees. Especially, the overhigh residual stress between fibers with small spacing will induce local interfacial failure, which is not conducive to the bearing capacity of the composite. It is an important technical approach to reduce the fiber segregation in order to improve the mechanical properties of the composite.

• 单位
  南昌航空大学