研究了两级拉伸疲劳载荷作用下,纤维增强复合材料界面的脱粘.首先基于剪切筒模型,建立了求解纤维与基体应力的控制微分方程,并求得了相关解答.然后借助断裂力学中描述疲劳裂纹扩展的公式和能量耗散率理论,给出了界面脱粘长度、加载次数以及脱粘应力之间的关系式.最后通过实例模拟了两级拉伸疲劳载荷作用下的界面裂纹扩展,分析了界面疲劳裂纹扩展速率、脱粘长度在不同加载方式下的变化规律,以及材料泊松比的变化对界面脱粘的影响.从而为进一步研究工程结构的疲劳破坏和材料的最优设计提供一定的理论依据.
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