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该文基于微观断裂力学的方法,针对Q460钢材角焊缝搭接接头的断裂行为进行了研究。分别通过对接焊缝试件的静力拉伸试验得到了焊缝材料的本构关系,11个开圆弧形平滑槽圆形截面拉伸试件标定了焊缝材料微孔扩张模型VGM和应力修正临界应变模型SMCS的断裂参量η、α,5个正面角焊缝搭接接头拉伸试验获得了焊接接头的荷载-变形曲线并进行了数值模拟。试验结果表明,E55-D2型焊材的角焊缝搭接接头拉伸破坏形式呈延性破坏。断裂参量结果分析表明,焊材的化学成分会导致焊缝金属断裂性能的差异。该文研究成果为焊缝材料建立了准确的数值模型,同时为高强度钢材焊缝的设计和焊接结构的破坏预测提供了一种有效的方法。
Based on the micro-fracture mechanics method, the fracture behavior of the fillet joints of Q460 steels was studied. The constitutive relations of the weld material were obtained by the static tensile test of butt-welded specimens respectively. Eleven circular arc specimens with circular cross-section were used to calibrate the VGM and stress The load-deformation curves of the welded joints were obtained and the numerical simulations were performed by amending the fracture parameters η, α of the critical strain model SMCS and the tensile tests of the five frontal fillet joints. The experimental results show that the ductile failure of the E55-D2 welding consumables in the tensile failure mode of the fillet joints. Analysis of fracture parameters results show that the chemical composition of welding consumables will lead to differences in the fracture properties of the weld metal. The research results provide an accurate numerical model for the weld material and provide an effective method for the design of the weld of high strength steel and the prediction of the failure of the welded structure.