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Yield and failure criteria for composite materials under static and dynamic loading

机译：静态和动态载荷下复合材料的屈服和破坏准则

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To facilitate and accelerate the process of introducing, evaluating and adopting new material systems, it is important to develop/establish comprehensive and effective procedures of characterization, modeling and failure prediction of structural laminates based on the properties of the constituent materials, e. g., fibers, matrix, and the single ply or lamina. A new failure theory, the Northwestern (NU-Daniel) theory, has been proposed for predicting lamina yielding and failure under multi-axial states of stress including strain rate effects. It is primarily applicable to matrix-dominated interfiber/interlaminar failures. It is based on micromechanical failure mechanisms but is expressed in terms of easily measured macroscopic lamina stiffness and strength properties. It is presented in the form of a master failure envelope incorporating strain rate effects. The theory was further adapted and extended to the prediction of in situ first ply yielding and failure (FPY and FPF) and progressive failure of multi-directional laminates under static and dynamic loadings. The significance of this theory is that it allows for rapid screening of new composite materials without extensive testing and offers easily implemented design tools. (C) 2015 Elsevier Ltd. All rights reserved.
机译：为了促进和加快引入，评估和采用新材料系统的过程，重要的是根据构成材料的特性，开发/建立全面而有效的表征结构层压板的特性，建模和破坏预测的程序。例如，纤维，基质和单层或薄层。已经提出了一种新的失效理论，即西北（NU-Daniel）理论，用于预测在包括应变率效应在内的多轴应力状态下的薄板屈服和失效。它主要适用于以矩阵为主的纤维间/层间故障。它基于微机械破坏机制，但以易于测量的宏观层板刚度和强度特性表示。它以包含应变率效应的主破坏包络线的形式呈现。该理论被进一步修改并扩展到在静态和动态载荷下原位第一层屈服和破坏（FPY和FPF）以及多向层压板的渐进破坏的预测。该理论的意义在于，它无需进行大量测试即可快速筛选新的复合材料，并提供易于实施的设计工具。 （C）2015 Elsevier Ltd.保留所有权利。

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