The objective of this work is to determine the fracture energy of a honeycomb/carbon-epoxy sandwich panel under mode II loading using the Asymmetric End-Notched Flexure (AENF) test. Experimental tests and numerical analyses aiming to validate all the procedures were performed. An equivalent crack length data reduction scheme was developed in order to simplify the experimental determination of the Resistance-curves (R-curves) using exclusively the load-displacement (P-δ) data. This strategy makes unnecessary the crack length monitoring during its propagation, which is hard to perform in mode II fracture tests. A mixed-mode I+II trapezoidal cohesive zone model was used for validating the proposed data reduction method. It was concluded that this methodology constitutes a suitable procedure for mode II fracture characterisation of debonding failure in composite sandwich panels.

这项工作的目的是使用不对称末端缺口弯曲 (AENF) 测试来确定蜂窝/碳环氧树脂夹芯板在模式 II 加载下的断裂能。进行了旨在验证所有程序的实验测试和数值分析。开发了一种等效裂纹长度数据缩减方案，以简化仅使用载荷位移 ( P - δ） 数据。这种策略使裂纹扩展过程中的裂纹长度监测变得不必要，这在模式 II 断裂试验中很难执行。混合模式 I+II 梯形粘性区域模型用于验证所提出的数据缩减方法。得出的结论是，这种方法构成了一种合适的程序，用于描述复合夹芯板中剥离失效的模式 II 断裂特征。