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为研究高强钢厚板在高应力三维度下的断裂模式,对18个厚度为26mm的Q345钢缺口板进行了拉伸断裂试验和基于结构钢椭球面断裂模型及偶联屈服模型的数值分析.结果显示:高强钢厚板缺口板在几何变化剧烈、应力高度集中的缺口根部断裂;缺口根部刻弧半径和缺口宽度愈小的试件;断裂延性愈差;断裂指数的分布规律和应力三维度具有较高的关联度,位于板厚中面的缺口根部应力三维度最高,是裂纹起裂点;当应力三维度介于0.43~0.72时,高强钢厚板的等效断裂应变和应力三维度较好地遵循幂函数演化.
In order to study the fracture mode of high strength steel plate under high stress and three dimensions, tensile fracture test and numerical analysis based on structural steel ellipsoid fracture model and coupled yield model were carried out on 18 Q345 steel plates with thickness of 26mm. The results show that the notch plate of high strength steel plate is severely fractured at the root of the notch where the geometric changes are intense and the stress is highly concentrated. The specimen with the smaller arc radius and notch width at the notch root, the worse fracture ductility, the distribution of fracture index and three dimensional stress With the higher degree of correlation, the three-dimensional stress at the root of notches in the middle of the plate thickness is the highest, which is the crack initiation point. When the three-dimensional stress is between 0.43 and 0.72, the equivalent fracture strain and stress three-dimensional Better follow the power function evolution.