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首页> 外文期刊>材料 >Estimation Method for Mixed Mode (I+II) Interlaminar Fracture Toughness of Composite Laminates under Low-Velocity Impact Loading
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Estimation Method for Mixed Mode (I+II) Interlaminar Fracture Toughness of Composite Laminates under Low-Velocity Impact Loading

机译：低速冲击载荷下复合材料层板混合模式（I + II）层间断裂韧性的估算方法

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摘要

A simple experimental method was developed in order to evaluate the mixed mode (I+II) interlaminar fracture toughness of polymer matrix composite laminates under low-velocity impact loading. The MMF (Mixed Mode Flexure) specimen was employed for determining the critical energy release rate at the onset of macroscopic crack growth. The SHPB (Split Hopkinson Pressure Bar) system was used for measuring the dynamic load and displacement. The dynamic response of the specimen was studied on the basis of computational results using finite element method. The dynamic stress field in the vicinity of the crack tip was similar to the static stress field when a slow-gradient ramped incident stress wave applied to the specimen. However, the dynamic stress field was largely oscillated with time when a stepped incident stress wave was applied. In the previous case, a simple formula based on static beam theory and compliance method could be applied for calculating the dynamic energy release rate. The experimental results agreed well with the above computational results.
机译：为了评估聚合物基复合材料层压板在低速冲击载荷下的混合模式（I + II）层间断裂韧性，开发了一种简单的实验方法。 MMF（混合模式挠曲）样品用于确定宏观裂纹扩展开始时的临界能量释放速率。 SHPB（霍普金森分离式压力棒）系统用于测量动态载荷和位移。基于有限元方法的计算结果，研究了试样的动力响应。当向试样施加缓慢梯度的入射应力波时，裂纹尖端附近的动态应力场与静态应力场相似。但是，当施加阶梯式入射应力波时，动态应力场会随时间大幅波动。在前一种情况下，可以采用基于静态梁理论和柔度法的简单公式来计算动态能量释放率。实验结果与上述计算结果吻合良好。

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