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Analytical determination of the modes I, II and III energy release rates in a delaminated laminate and validation of a delamination criterion

机译:分层层压板中I,II和III模式能量释放速率的分析测定和分层标准的验证

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摘要

The aim of this paper is the analytical determination of the strain energy release rates in a delaminated laminate by means of a model of plates which provides no singular stresses. The strain energy release rates are expressed as quadratic functions of the interfacial stresses at the crack tip. These expressions and relevant delamination criteria can help predict delamination onset and growth. As an application example, data from edge delamination tests on carbon-epoxy laminates are used for determining a mode III delamination criterion involving the corresponding energy release rate. This criterion yields very accurate predictions and its analytical expression validates from an energy point of view a maximum stress criterion proposed in an earlier paper.
机译:本文的目的是通过不提供奇异应力的平板模型来分析确定分层层压板中的应变能释放速率。应变能释放率表示为裂纹尖端处界面应力的二次函数。这些表达和相关的分层标准可以帮助预测分层的发生和发展。作为一个应用示例,来自碳-环氧层压板边缘脱层测试的数据用于确定涉及相应能量释放速率的III型脱层标准。该判据产生了非常准确的预测,并且其分析表达式从能量的角度验证了早先论文中提出的最大应力判据。

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