The pure mode-II fracture behavior of an adhesively bonded glass fiber reinforced polymer (GFRP)/steel joint was experimentally investigated using a four-point end-notched flexure (4ENF) test. Cracking of the 4ENF specimen initiated and propagated in the adhesive-steel surface. The dominant failure mode observed in all specimens was adhesive-steel interface failure. The compliance of the 4ENF specimen was determined with the rigid joint model and finite element method. The extended global method was employed to obtain a simple analytical solution of the mode-II energy release rate, and the corresponding results were compared with that determined by the virtual crack closure technique (VCCT). The full R-curve for the pure mode-II fracture behavior of an adhesively bonded pultruded GFRP/steel joint was obtained. Then, the VCCT was used to determine the load–displacement curves of the 4ENF specimens for validating the accuracy and applicability of the pure mode-II fracture criteria of the adhesively bonded pultruded GFRP/steel joint.

使用四点端部缺口弯曲 (4ENF) 测试对粘合粘合的玻璃纤维增​​强聚合物 (GFRP)/钢接头的纯 II 型断裂行为进行了实验研究。4ENF 试样的裂纹在粘合钢表面开始并扩展。在所有试样中观察到的主要失效模式是粘合剂-钢界面失效。4ENF 试件的柔度由刚性接头模型和有限元方法确定。采用扩展全局方法获得了模式II能量释放率的简单解析解，并将相应结果与虚拟裂纹闭合技术（VCCT）确定的结果进行了比较。获得了粘接拉挤的 GFRP/钢接头的纯 II 型断裂行为的完整 R 曲线。然后，