New closed-form analytical expressions of the energy release rate of a bimaterial cracked specimen are derived, when it experiences pure mode I in an asymmetric double cantilever test, and pure mode II in an asymmetric end-notched flexure test. The analysis is based on the strain coenergy and on the laminated beam theory. The results of the analytical approach are compared with those obtained using the finite element method in two ways: by the virtual crack closure technique at a test point and by cohesive elements during a virtual delamination test. The agreement is excellent in both cases.

中文翻译：

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在纯模式 I 和 II 下测试的双材料样本的能量释放率

推导了双材料裂纹试样在非对称双悬臂梁试验中经历纯模式 I 和非对称端部缺口弯曲试验中经历纯模式 II 时能量释放率的新封闭式解析表达式。该分析基于应变同能和层合梁理论。通过两种方式将分析方法的结果与使用有限元方法获得的结果进行比较：通过测试点处的虚拟裂纹闭合技术和通过虚拟分层测试期间的粘性单元。在这两种情况下，协议都非常好。