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首页> 外文期刊>Composite Structures >Fracture mechanism and strength evaluation of A15052/CFRP joint produced by coaxial one-side resistance spot welding
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Fracture mechanism and strength evaluation of A15052/CFRP joint produced by coaxial one-side resistance spot welding

机译：同轴单侧电阻点焊生产A15052 / CFRP接头的断裂机理及强度评价

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摘要

Carbon fibre reinforced plastics (CFRP) and Al5052 sheets were joined by coaxial one-side resistance spot welding (COS-RSW). The cross-section features and mechanical behaviour of the joints in single lap shear (SLS) test were investigated. The underlying joining mechanism was found to be the NAC@O covalent bond between silane coupling agent and CFRP via the X-ray photoelectron spectroscopy (XPS) analysis. The joints of low welding current exhibited interfacial fracture with low strength and small displacement during the SLS test, while the joints of high welding current presented a staged failure process with tearing of the CFRP, which gave higher strength and larger displacement. The bonding zone was divided into three sub zones, which showed specific surface morphologies and distinct contributions to the load-bearing capacity of the joint. The joining strength showed a positive correlation with welding current until the occurrence of decomposition in CFRP, which reduced the area of effective bonding zone and played a negative effect on strength.
机译：通过同轴单侧电阻点焊（COS-RSW）连接碳纤维增强塑料（CFRP）和AL5052片材。研究了单圈剪切（SLS）试验中的接头的横截面特征和力学行为。发现潜在的连接机制是硅烷偶联剂和CFRP之间的NAC @ O共价键，通过X射线光电子光谱（XPS）分析。低焊接电流的关节在SLS试验期间表现出具有低强度和小位移的界面骨折，而高焊接电流的关节呈现出撕裂的CFRP撕裂的分阶段失效过程，其产生更高的强度和更大的位移。将粘合区分成三个子区域，其显示出特异性表面形貌和对关节承载能力的不同贡献。连接强度显示出与焊接电流的正相关，直到CFRP中分解的发生，这减少了有效粘合区的面积并对强度作用负面影响。

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