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针对汽车车身中应用日益广泛的钢板胶接结构,通过实验得到了不同胶层局部缺陷对接头承载能力的影响规律,进而采用接头的三维弹塑性有限元模型,解释了实验结果,并提出了接头承载危险系数(K)的概念。研究结果表明,胶层为四角缺陷时,接头处的危险系数随缺陷面积的增加而增大(从0.66增加到0.91),接头的断裂强度由8640N降低到8121N;胶层为中央缺陷时,接头处的危险系数随中央缺陷面积的增加增幅较小,接头承载能力基本不变。
Aiming at the steel plate bonding structure which is widely used in automobile body, the influence law of different local defects on the bearing capacity of the joint is obtained by experiments. The three-dimensional elasto-plastic finite element model of the joint is used to explain the experimental results. The concept of carrying a risk factor (K). The results show that when the adhesive layer is a tetragonal defect, the hazard coefficient at the joint increases with the increase of the defect area (from 0.66 to 0.91), and the fracture strength of the joint decreases from 8640N to 8121N. When the adhesive layer is the central defect, The hazard coefficient increases slightly with the increase of the central defect area, and the bearing capacity of the joint is basically unchanged.