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为了考察Q460D高强钢在多轴应力状态下的断裂性能,本文分别对切口圆棒试件、剪切型及拉剪型平板切口试件、平板槽口试件进行了断裂试验.随后,利用扫描式电子显微镜对各试件断口处的微观断裂机制进行了观察分析,考察了应力状态对结构钢材断裂性能的影响,并利用试验结果对Rice-Tracey延性断裂准则进行了校准.试验研究结果表明应力状态对Q460D钢的延性与微观断裂机制有显著的影响.Rice-Tracey延性断裂准则可以准确的捕捉材料因应力三轴度升高引起的延性下降趋势.
In order to investigate the fracture behavior of Q460D high-strength steel under multi-axial stress conditions, the fracture tests of the notched round bar specimens, the sheared and sheared flat-plate notched specimens and the flat-notched specimens were carried out respectively.After that, The microscopic rupture mechanism at the fracture of each specimen was observed by electron microscope, and the influence of stress state on the fracture properties of the structural steel was investigated. The Rice-Tracey ductile fracture criterion was calibrated by the test results. The experimental results show that the stress state The ductility and micro-fracture mechanism of Q460D steel have a significant impact.Rice-Tracey ductile fracture criterion can accurately capture the material due to stress triaxiality caused ductility decline.