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采用有限元法分析了在残余应力和外加横向载荷作用下纤维体积分数对SiC/Ti-6Al-4V复合材料横向拉伸行为的影响。通过弹簧连接纤维与基体界面的重合节点来模拟界面脱粘。结果表明,在界面结合强度一定时,界面脱粘应力(对应于应力-应变曲线上应变的跳跃)受0°方向界面径向残余应力影响较大;在界面脱粘先于基体屈服时,复合材料失效应力(对应于应力-应变曲线上的水平部分)主要取决于纤维体积分数,且体积分数越低,失效应力越高。
The influence of fiber volume fraction on the transverse tensile behavior of SiC / Ti-6Al-4V composite under residual stress and applied transverse load was analyzed by finite element method. The interface debonding is modeled by the spring-loaded coincidence node of the fiber-matrix interface. The results show that the interfacial debonding stress (corresponding to the jump of strain in the stress-strain curve) is greatly affected by the radial residual stress in the 0 ° direction when the interfacial bonding strength is constant. When the interfacial debonding occurs before the substrate yields, The material failure stress (corresponding to the horizontal part of the stress-strain curve) depends mainly on the fiber volume fraction, and the lower the volume fraction, the higher the failure stress.