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室温下对LZ50钢进行了系统的单轴应变控制和应力控制循环实验,揭示了材料的应变循环特性,讨论了平均应力、应力幅值、应力比及加载波形对材料棘轮行为的影响,重点比较和分析了传统的名义应力控制与改进的真应力控制模式下材料棘轮演变的异同点。结果表明:LZ50钢的变形行为没有明显的率相关性,并可视为循环稳定材料;真应力控制下产生的棘轮应变和棘轮应变率均小于名义应力控制下的结果,且两种控制方式对棘轮变形的影响与总的变形程度有关;棘轮应变随着平均应力和应力幅值的增大表现出单调上升的趋势,但不随应力比单调变化。
The uniaxial strain control and stress control cycle experiments of LZ50 steel were carried out at room temperature. The strain cycling characteristics of LZ50 steel were revealed. The effects of average stress, stress amplitude, stress ratio and loading waveform on the ratcheting behavior were discussed. And analyzes the similarities and differences between the traditional nominal stress control and the improved true stress control mode of material ratchet evolution. The results show that the deformation behavior of LZ50 steel has no significant rate dependence and can be regarded as the material of cyclic stability. The ratchet strain and ratcheting strain under true stress control are both less than those under nominal stress control, and the two control methods The influence of ratchet deformation is related to the total deformation. The ratchet strain shows a monotonically increasing trend with the increase of average stress and stress amplitude, but does not change monotonically with the stress ratio.