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以16MnR钢的单向拉伸曲线为依据。对三点弯试件采用随动强化模型进行弹塑性有限元分析。结果表明,预应变对16MnR钢的断裂韧性指标COD值具有显著的影响;COD降低系数随预应变的增大而减小。
Based on the unidirectional tensile curve of 16MnR steel. Elastic-plastic finite element analysis of three-point bending test specimen was carried out using follow-up strengthening model. The results show that the pre-strain has a significant effect on the COD value of fracture toughness of 16MnR steel. The COD reduction coefficient decreases with the increase of pre-strain.