Carbon Fiber Reinforced Plastic (CFRP) and metal adhesive joints have the advantages of lightweight structure, simple process, and no disruption of fiber continuity. The strength of adhesive joints has been the weak point of this structure. In order to provide a reference for the safe design of CFRP adhesive joints, the effect of the different surface energy of metal surfaces on the shear strength of CFRP/steel adhesive joints was studied. The surface energy of the metal surface was changed by changing the roughness of the metal surface. Test pieces with different roughness were designed. Roughness measurement tests, contact angle and surface energy measurement tests, and shear strength tests were conducted. It reveals the evolution of surface energy on the shear strength of CFRP/steel joints. The results show that the surface roughening changes the solid–liquid contact angle, enhances the solid surface energy, increases the wettability and adhesive capacity of the adhesive, and ultimately improves the shear strength. Therefore, improving the surface energy of stainless steel surfaces can significantly improve the shear strength of CFRP/stainless steel adhesive joints.

中文翻译：

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表面能对CFRP/钢粘接接头剪切强度的影响


碳纤维增强塑料（CFRP）和金属粘合接头具有结构轻、工艺简单、不破坏纤维连续性等优点。粘合接头的强度一直是该结构的弱点。为了给CFRP粘接接头的安全设计提供参考，研究了金属表面不同表面能对CFRP/钢粘接接头剪切强度的影响。通过改变金属表面的粗糙度来改变金属表面的表面能。设计了不同粗糙度的试件。进行了粗糙度测量测试、接触角和表面能测量测试以及剪切强度测试。它揭示了表面能对 CFRP/钢接头剪切强度的演变。结果表明，表面粗糙化改变了固液接触角，增强了固体表面能，增加了粘合剂的润湿性和粘合能力，最终提高了剪切强度。因此，提高不锈钢表面的表面能可以显着提高CFRP/不锈钢粘接接头的剪切强度。