The failure mode is crucial to the interfacial bond performance between carbon-fiber-reinforced polymer plates and steel substrates. Existing studies mainly focused on the cohesive failures in the adhesive; however, research on other types of failure modes is still limited. In this article, a series of single-shear bonded joints are prepared to investigate the bond behaviors of the carbon-fiber-reinforced polymer–steel interfaces based on carbon-fiber-reinforced polymer delamination failures and hybrid failures. Three kinds of adhesives—which have different tensile strengths and elastic moduli—and two kinds of carbon-fiber-reinforced polymer plates—which have different interlaminar shear strengths—are used to evaluate the influencing factors of carbon-fiber-reinforced polymer–steel interfaces. The three-dimensional digital image correlation technique is applied to measure the strain and the displacement on the surface of each specimen. The obtained test results include the strain distribution, the ultimate load, the failure mode, the load–slip curves, and the bond–slip relationships. For the carbon-fiber-reinforced polymer delamination mode, the results show that the load at the debonding stage is closely related to the interlaminar shear strength of the carbon-fiber-reinforced polymer plate, and the higher the interlaminar shear strength is, the greater the load. However, for the hybrid mode, the load of the whole test process is independent of the interlaminar shear strength of the carbon-fiber-reinforced polymer plate.

中文翻译：

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基于碳纤维增强聚合物分层失效和混合失效的碳纤维增强聚合物-钢界面实验研究

失效模式对碳纤维增强聚合物板和钢基材之间的界面粘合性能至关重要。现有的研究主要集中在粘合剂的内聚失效上；然而，对其他类型故障模式的研究仍然有限。在本文中，基于碳纤维增强聚合物分层失效和混合失效，制备了一系列单剪粘结接头，以研究碳纤维增强聚合物-钢界面的粘结行为。使用三种不同拉伸强度和弹性模量的粘合剂和两种不同层间剪切强度的碳纤维增强聚合物板来评估碳纤维增强聚合物-钢界面的影响因素. 应用三维数字图像相关技术测量每个试样表面的应变和位移。获得的测试结果包括应变分布、极限载荷、失效模式、载荷-滑移曲线和粘结-滑移关系。对于碳纤维增强聚合物分层模式，结果表明，脱粘阶段的载荷与碳纤维增强聚合物板的层间剪切强度密切相关，层间剪切强度越大，层间剪切强度越大。负载。然而，对于混合模式，整个测试过程的载荷与碳纤维增强聚合物板的层间剪切强度无关。获得的测试结果包括应变分布、极限载荷、失效模式、载荷-滑移曲线和粘结-滑移关系。对于碳纤维增强聚合物分层模式，结果表明，脱粘阶段的载荷与碳纤维增强聚合物板的层间剪切强度密切相关，层间剪切强度越大，层间剪切强度越大。负载。然而，对于混合模式，整个测试过程的载荷与碳纤维增强聚合物板的层间剪切强度无关。获得的测试结果包括应变分布、极限载荷、失效模式、载荷-滑移曲线和粘结-滑移关系。对于碳纤维增强聚合物分层模式，结果表明，脱粘阶段的载荷与碳纤维增强聚合物板的层间剪切强度密切相关，层间剪切强度越大，层间剪切强度越大。负载。然而，对于混合模式，整个测试过程的载荷与碳纤维增强聚合物板的层间剪切强度无关。结果表明，脱粘阶段的载荷与碳纤维增强聚合物板的层间剪切强度密切相关，层间剪切强度越高，载荷越大。然而，对于混合模式，整个测试过程的载荷与碳纤维增强聚合物板的层间剪切强度无关。结果表明，脱粘阶段的载荷与碳纤维增强聚合物板的层间剪切强度密切相关，层间剪切强度越高，载荷越大。然而，对于混合模式，整个测试过程的载荷与碳纤维增强聚合物板的层间剪切强度无关。