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为了解决含有橡胶材料的界面断裂问题,提出了一种改进的虚裂纹闭合技术,该技术采用逐步线性化的方法,同时考虑了材料非线性与几何非线性的影响。首先,计算了双裂纹橡胶试件裂纹尖端的能量释放率,通过与已有文献的比较,可知所提出的改进的虚裂纹闭合技术是可靠、有效的。其次,对含有橡胶夹层的SLB模型进行了研究,通过计算分层前缘能量释放率Ⅰ型、Ⅱ型分量,和其与总能量释放率的比值,可知橡胶材料的引入使结构的能量释放率总量增大,Ⅱ型分量的比例明显增大。在多材料体系连接结构的断裂分析中,计算了不同分层位置下裂纹的能量释放率,并考虑了外层纤维缠绕层尺寸变化对能量释放率的影响。最后,提出了相应的多材料体系构件的断裂准则。
In order to solve the problem of interfacial fracture with rubber material, an improved virtual crack closure technique is proposed, which adopts a stepwise linearization method and considers the influence of material nonlinearity and geometric nonlinearity. First, the energy release rate of the crack tip of the double-crack rubber specimen is calculated. Compared with the existing literature, the proposed improved virtual crack closing technique is reliable and effective. Secondly, the SLB model with rubber interlayer was studied. By calculating the energy release rate of layer Ⅰ and type Ⅱ, and the ratio of the energy release rate to the total energy release rate, we can see that the introduction of rubber material makes the structure energy release rate The total increase, the proportion of type Ⅱ component increased significantly. In the fracture analysis of the multi-material system, the energy release rate of cracks under different layering positions was calculated, and the influence of the size change of the outer fiber wound layer on the energy release rate was also considered. Finally, the fracture criterion of multi-material system components is proposed.