倾斜短纤维拉出的简化分析

为了研究具有任意倾斜角度的短纤维从脆性基体中拉出的过程和能耗,提出了一种简化分析方法.忽略拉出之前的界面脱粘过程及纤维拉出段的局部弯曲,考虑纤维拉出与基体剥落耦合,建立了拉出过程的非线性控制方程.用迭代法求解,得到拉出过程中短纤维桥联力与张开位移的关系,拉出能量以及界面摩擦应力,纤维倾斜角、长度等参数的影响.模拟计算结果表明:基体剥落可以提高拉出力,改变拉出力与位移的关系;适当选择界面摩擦和纤维长度可以显著增加拉出能耗.

Simplified Analysis of Pull-out Inclined Short Fibers

A simplified method was proposed to analyze the bridging force and energy dissipation in the pulling-out process of inclined short fibers from brittle matrix.Coupling the fiber pull-out with matrix spalling and neglecting the local bending of fibers in the interface debonding process before fiber pull-out and in the pull-out section.some nonlinear control equations were given to the fiber pull-out process with an iteration method to solve them.In this way the relationship between bridging force and opening displacement during short fiber pull-out was given.as well as the effects of such parameters as pull-out energy,interface friction stress,inclination angle and fiber length on the pull-out process.Simulation results showed that the matrix spalling can increase the pull-out force of fibers and change the relationship between pull-out force and displacement and,what's more,a conclusion is drawn that choosing appropriately the interface friction and length of fibers will significantly increase the pull-out energy dissipation.