This paper aims to experimentally and numerically explore fracture mechanism characteristics of ultra-thin chopped carbon fiber tape-reinforced thermoplastics (UT-CTT) hat-shaped hollow beam under transverse static and impact loadings. Three distinct failure modes were observed in the impact bending tests, whereas only one similar progressive collapse mode was observed in the transverse bending tests. The numerical model was to incorporate some hypothetical inter-layers in UT-CTT and assign them with the failure model as cohesive zone model, which can perform non-linear characteristics with failure criterion for representing delamination failure. The dynamic material parameters for the impact model were theoretically predicted with consideration of strain-rate dependency. It shows that the proposed modeling approach for interacting damage modes can serve as a benchmark for modeling damage coupling in composite materials.

中文翻译：

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横向载荷和冲击载荷作用下超薄短切碳纤维带增强热塑性帽子形空心梁的断裂机理

本文旨在通过实验和数值研究超薄切碎的碳纤维带增强热塑性塑料（UT-CTT）帽形空心梁在横向静载荷和冲击载荷下的断裂机理。在冲击弯曲试验中观察到三种不同的破坏模式，而在横向弯曲试验中仅观察到一种类似的渐进塌陷模式。数值模型是在UT-CTT中包含一些假设的中间层，并将它们与破坏模型一起指定为内聚区模型，该模型可以执行具有表示破坏分层的破坏准则的非线性特征。理论上考虑了应变率依赖性来预测冲击模型的动态材料参数。