Failure analysis of FRP laminates by means of physically based phenomenological models
Failure analysis of FRP laminates by means of physically based phenomenological models
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DOI：
10.1016/s0266-3538(96)00140-6
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发表时间：
1998-01-01
影响因子：
9.1
通讯作者：
Schurmann, H
中科院分区：
文献类型：
--
作者：
Puck, A;Schurmann, H
FRP复合材料结构构件的实际失效分析需要考虑非线性应力/应变关系。在层合板设计和确定FRP结构构件的安全系数时，强烈需要断裂准则和退化模型，这些准则和模型足够简单，可以应用于常见的工程问题，同时仍然与物理现实很好地吻合。必须通过单独的失效标准区分纤维失效和纤维间失效。最近的一项成功是引入了纤维间破坏准则，该准则非常现实地模拟了复合材料的脆性破坏行为。这些不仅提供了实际的失效应力，而且还指示了裂纹方向，这在评估断裂的可能影响时是极其重要的信息。裂纹萌生后，随着载荷的增加，受影响层的刚度逐渐降低，直到一层中的纤维断裂引起层合板的最终失效。此外，一个倾斜的楔形纤维间裂纹可能导致最终失败。从现在开始，可以评估这些现象引起的骨折风险。本文推导了裂缝角的确定方法，这是裂缝角评价的关键。(C)1998爱思唯尔科技有限公司版权所有。
A realistic failure analysis of structural members made of FRP composites requires consideration of the non-linear stress/strain relationships. In laminate design and for determination of safety factors of FRP structural members, there is a strong need for fracture criteria and degradation models which are simple enough for application in common engineering problems while still being in good agreement with physical reality. It is essential to distinguish between fibre failure and inter-fibre failure by separate failure criteria. A recent success was the introduction of inter-fibre failure criteria which model the brittle failure behaviour of composites very realistically. These not only provide realistic stresses to failure, but also indicate the crack direction, which is an extremely important piece of information when evaluating the likely effect of fracture. After crack initiation, the stiffnesses of the affected plies degrade gradually with increasing load, until fibre fracture in one ply provokes ultimate failure of the laminate. Also, an inclined wedge-shaped inter-fibre crack can lead to ultimate failure. From now on, the risk of fracture caused by these phenomena can be evaluated. The determination of the fracture angle which is the key for this evaluation is derived in the present paper. (C) 1998 Elsevier Science Ltd. All rights reserved.