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首页> 外文期刊>Experimental Mechanics >A Novel Method for Dynamic Short-Beam Shear Testing of 3D Woven Composites
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A Novel Method for Dynamic Short-Beam Shear Testing of 3D Woven Composites

机译：3D机织复合材料动态短光束剪切测试的新方法

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摘要

A new test method for performing dynamic short-beam shear tests using a momentum trapped Hopkinson pressure bar is proposed. Angle-interlock 3D woven composite specimens were tested under quasi-static and dynamic loading conditions to determine the effect of loading rate on damage evolution. The equilibrium condition in the composite specimen under dynamic loads was verified using finite element analysis of the experiment. A high speed camera was used to capture delamination initiation and propagation during both quasi-static and dynamic experiments. Analysis of the load-deflection curves and the high speed images revealed a good correlation between the modes of damage initiation and propagation with the features in the loading response. The apparent inter-laminar shear strength and the bending stiffness increased with rate of loading. While the damage was observed to propagate at a relative steady rate during quasi-static loading, the high rate of energy input during dynamic loading resulted in a rapid propagation of damage and a subsequent loss of stiffness in the composite as noted in the load-deflection curve.
机译：提出了一种使用动量捕获的霍普金森压力棒进行动态短梁剪力试验的新方法。对角互锁3D编织复合材料标本在准静态和动态载荷条件下进行了测试，以确定载荷速率对损伤演变的影响。使用实验的有限元分析验证了复合材料试样在动态载荷下的平衡条件。在准静态和动态实验期间，均使用高速相机捕获分层的开始和传播。对载荷-挠度曲线和高速图像的分析表明，损伤开始和传播的模式与载荷响应中的特征之间具有良好的相关性。表观层间剪切强度和弯曲刚度随载荷速率的增加而增加。观察到损伤在准静态载荷下以相对稳定的速率传播，而在动态载荷下较高的能量输入速率导致损伤迅速传播，随后复合材料的刚度损失如载荷挠度所示。曲线。

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