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A computational framework for modelling impact induced damage in ceramic and ceramic-metal composite structures

机译：陶瓷和陶瓷-金属复合结构中冲击诱发损伤建模的计算框架

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摘要

When ceramic or ceramic-metal composite structures are subjected to impact loading, they undergo various deformation phases such as plastic yielding, pulverization, fragmentation, tensile spalling, interface debonding, penetration etc. In order to study these phenomenological characteristics and produce insightful observation, numerical simulation is inevitable. Apart from reasonably accurate constitutive model, a numerical scheme must also accommodate any possible loss (in the case of fragmentation and material separation) of the continuum nature of the problem domain. This is generally difficult to achieve through mesh-based methods. In this study a computational framework based on smoothed particle hydrodynamics (SPH), a particle-based method, is explored and revamped. Damage growth and localized cracks are modelled through a pseudo-spring analogy, wherein particle-interactions are modulated based on material strength reduction after damage initiation. Different material models are coupled in this analogy for investigating different paradigms of penetration mechanics in ceramic and ceramic metal composites. The computational framework is first validated through experimentally obtained results of flyer plate tests on Silicon Carbide (SiC) disc. Subsequently the framework is explored in simulating more complex failure mechanisms involving multiaxial crack interaction and fragmentation in ceramic-metal composite target system. (C) 2017 Elsevier Ltd. All rights reserved.
机译：当陶瓷或陶瓷-金属复合结构受到冲击载荷时，它们会经历各种变形阶段，例如塑性屈服，粉碎，破碎，拉伸剥落，界面剥离，渗透等。为了研究这些现象学特征并产生深刻的观察，数值模拟是不可避免的。除了合理准确的本构模型，数值方案还必须考虑问题域连续性的任何可能损失（在破碎和材料分离的情况下）。通常很难通过基于网格的方法来实现。在这项研究中，探索并改进了基于基于粒子的方法平滑粒子流体动力学（SPH）的计算框架。通过伪弹簧类比对损伤的增长和局部裂纹进行建模，其中基于损伤引发后材料强度的降低来调节粒子相互作用。在这个类比中，将不同的材料模型耦合在一起，以研究陶瓷和陶瓷金属复合材料中的渗透机理的不同范例。首先通过实验获得的在碳化硅（SiC）圆盘上的传单板测试结果验证了计算框架。随后，在模拟陶瓷-金属复合靶系统中涉及多轴裂纹相互作用和破碎的更复杂的失效机制时，探索了该框架。 （C）2017 Elsevier Ltd.保留所有权利。

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