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Modelling damage of lightweight composites subjected to extreme loading conditions

机译：模拟轻质复合材料在极端载荷条件下的损坏

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Although lightweight composites have been studied extensively modelling their damage processes stillrnremains to be a challenging task. This is mainly due to the complexity of anisotropic failurernmechanisms of fibre and matrix as well as interaction between the composite and other materials. In thisrnpaper, numerical simulations of dynamic response of various lightweight composite structures subjectedrnto either projectile impact or blast are presented, which cover fibre metal laminates, PVC foam corernsandwiches made with GRP skins or aluminium alloy skins. Different constitutive models and failurerncriteria were used to model constituent materials. To model the aluminium alloy subjected to impact,rnelasto-plastic model with rate dependent behaviour controlled by stress ratios was first employed, andrndamage evolution controlled by both shear and tensile failure laws. Then Johnson-Cook rate-dependentrnplastic model and Johnson-Cook failure criterion were applied for blast loading case. The PVC foamrnunder compression was modelled as a crushable foam material. The GRP skins were modelled as anrnorthotropic elastic material up to the onset of failure, and the subsequent damage evolution wasrnmodeled using Hashin?s failure criteria and controlled by fracture energy. The resin at the interfacernbetween the GRP skin or aluminium skin and the PVC foam was modelled using the cohesive elementsrnavailable in Abaqus. The numerical simulations were compared with the corresponding experimentalrnresults. Very good correlation has been obtained in terms of the load-displacement trace, failure modernand perforation energy. Modelling of damage in composites paves the way to study their damagerntolerance.
机译：尽管已经对轻质复合材料进行了广泛的研究，但对其破坏过程进行建模仍然是一项艰巨的任务。这主要是由于纤维和基体的各向异性破坏机制的复杂性以及复合材料和其他材料之间的相互作用。在本文中，给出了承受弹丸冲击或爆炸冲击的各种轻型复合结构动力响应的数值模拟，这些结构涵盖了纤维金属层压板，由GRP蒙皮或铝合金蒙皮制成的PVC泡沫夹心三明治。不同的本构模型和失效准则被用于对组成材料进行建模。为了对铝合金进行冲击建模，首先采用由应力比控制速率依赖行为的弹塑性模型，并由剪切和拉伸破坏定律控制破坏演化。然后将Johnson-Cook速率依赖的塑性模型和Johnson-Cook破坏准则应用于爆炸荷载情况。压缩下的PVC泡沫被模拟为可压碎的泡沫材料。 GRP蒙皮被建模为各向异性的弹性材料，直至破坏开始，随后使用Hashin的破坏准则对随后的损伤演化进行建模，并通过断裂能进行控制。使用Abaqus中可用的内聚元素对GRP蒙皮或铝皮和PVC泡沫之间的界面处的树脂进行建模。将数值模拟与相应的实验结果进行了比较。在载荷-位移轨迹，破坏现代性和射孔能量方面已经获得了很好的相关性。复合材料中的损伤建模为研究其损伤耐受性铺平了道路。

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