晶须长径比对树脂基复合材料力学行为影响的数值模拟

在单向晶须增强树脂基复合材料的轴对称模型和已有研究成果基础上,利用有限元分析方法,研究该类复合材料中晶须长径比的变化对材料整体力学行为的影响.结果表明:晶须长径比对晶须应力作用明显大于对基体的影响;晶须的长径比h/r≤30时,随着晶须长径比的增大,发生在晶须端部处的集中应力急剧增加;但当长径比h/r＞30时,长径比的进一步增加对集中应力影响不大;随着晶须长径比的增大,界面剪切应力减小,分布曲线下移;但当长径比h/r＞30时,长径比的进一步增加对剪切应力影响不大;随着晶须长径比的增加,复合材料的拉伸强度逐渐增大.

Numerical simulation to effect of whisker aspect ratio on the mechanical behavior of composites

Based on the single whisker axisymmetrical and others research production, the effect of varied whisker aspect ratio on the mechanical behavior of this composites is analysed by the finite element analysis method.It is shown that: the effect to the whisker than to the resin by the aspect of whisker; the more of the aspect ratio of the whisker,the larger of the concentrated stress occur on the bottom of whisker when the aspect ratio less than 30,however when the aspect ratio beyond 30,the effect of aspect ratio to the concentrated stress is very small; the more of the aspect ratio of the whisker, the smaller of the shearing stress occur on the interface when the aspect ratio less than 30,however when the aspect ratio beyond 30,the effect of aspect ratio to the shearing stress is very small; the more of the aspect ratio of the whisker, the larger of the tensile-strength in the composites.