Previous investigation on the crashworthiness of braided composite tubes did not take the relationship between adiabatic shear failure and temperature rise into account during dynamic loading. In this study, transient temperature rise caused by adiabatic effect was detected and captured for the three-dimensional braided carbon/epoxy composite specimens during axial impact compression under 600–800/s. A mesostructure model was established based on three-dimensional braided tube architecture to numerically characterize the mechanical and thermal response in material. Based on the results, non-uniform temperature distribution shows good correlation with adiabatic shear failure in the material. Key scientific issues are discovered including the position, morphology, time sequence, and response process of the temperature rise. The catastrophic shear behavior with accelerated temperature rise occurs after the peak force and accompanies the progressive failure process. Nodes having room temperature in the adiabatic shear zone indicates that some positions in plastic zone may still behave as elastic state. There exists different plastic slip distances due to shear instability in the path along or crossing the adiabatic shear band. Through this investigation, the model considering the adiabatic effect was able to show the dynamic shear mechanism involving the fracture position, morphology, and progressive thermo-mechanical response of the temperature rise, which cannot be revealed by experimental testing.

中文翻译：

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轴向冲击压缩3D编织复合管绝热剪切破坏引起的温升

先前对编织复合管耐撞性的研究没有考虑动态加载过程中绝热剪切破坏与温升之间的关系。在这项研究中，在 600-800/s 的轴向冲击压缩过程中，对于三维编织碳/环氧树脂复合材料试样，检测并捕获了由绝热效应引起的瞬态温升。基于三维编织管结构建立细观结构模型，以数值表征材料的机械和热响应。根据结果​​，非均匀温度分布与材料中的绝热剪切破坏具有良好的相关性。发现了温升的位置、形态、时序、响应过程等关键科学问题。在峰值力之后，伴随着渐进式失效过程，会出现具有加速升温的灾难性剪切行为。绝热剪切区中具有室温的节点表明塑性区中的某些位置可能仍表现为弹性状态。由于沿或穿过绝热剪切带的路径中的剪切不稳定，存在不同的塑性滑移距离。通过这项研究，考虑绝热效应的模型能够显示涉及断裂位置、形态和温度升高的渐进热机械响应的动态剪切机制，这是实验测试无法揭示的。绝热剪切区中具有室温的节点表明塑性区中的某些位置可能仍表现为弹性状态。由于沿着或穿过绝热剪切带的路径中的剪切不稳定，存在不同的塑性滑移距离。通过这项研究，考虑绝热效应的模型能够显示涉及断裂位置、形态和温度升高的渐进热机械响应的动态剪切机制，这是实验测试无法揭示的。绝热剪切区中具有室温的节点表明塑性区中的某些位置可能仍表现为弹性状态。由于沿或穿过绝热剪切带的路径中的剪切不稳定，存在不同的塑性滑移距离。通过这项研究，考虑绝热效应的模型能够显示涉及断裂位置、形态和温度升高的渐进热机械响应的动态剪切机制，这是实验测试无法揭示的。