CF/Al复合材料制备热变形行为与热残余应力分布  

Process-induced Thermal Deformation Behavior and Thermal Residual Stress Distribution in CF/Al Composites

作　　者：张益豪 严毅 王振军[1] 蔡长春[1] 徐志锋[1] 余欢[1] Zhang Yihao;Yan Yi;Wang Zhenjun;Cai Changchun;Xu Zhifeng;Yu Huan(School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China;School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学航空制造工程学院,江西南昌330063 [2]南昌航空大学材料科学与工程学院,江西南昌330063

出　　处：《稀有金属材料与工程》2022年第2期661-668,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51765045);航空科学基金(2019ZF056013);江西省自然科学基金(20202ACBL204010)。

摘　　要：针对连续碳纤维增强铝基复合材料(CF/Al复合材料),采用细观力学数值模拟与热性能实验结合的方法,研究了真空压力浸渗制备过程中的热变形行为和热残余应力分布。结果表明,复合材料的横向热应变量远大于轴向热应变量,且具有横观各向同性,纤维随机分布的单胞有限元模型能够准确地预测复合材料轴向与横向热变形行为曲线;复合材料制备完成后纤维和基体合金分别处于压应力和拉应力状态,基体和纤维的横向热残余应力均小于其轴向热残余应力,且均表现出横观各向同性;基体合金在轴向热残余拉应力作用下会出现不同程度的损伤现象,特别是纤维间距较小部位过高的热残余应力会引发界面的局部失效,从而不利于发挥复合材料承载性能,减少纤维局部偏聚是进一步提高复合材料力学性能的重要技术手段。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.

关 键 词：铝基复合材料 热残余应力 细观力学 热变形 损伤 

分 类 号：TB333[一般工业技术—材料科学与工程]