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对单轴循环加载下,峰值应力对NiTi形状记忆合金(SMA)塑性行为的影响进行了研究。考虑到实际工况,对NiTi形状记忆合金在3种应力条件下(恒定峰值应力、阶梯峰值应力以及震荡峰值应力)的峰值应变、残余应变以及耗散能的变化进行实验分析。对于恒定峰值应力,发现峰值应力越高,NiTi形状记忆合金的超弹性劣化现象就越明显;对于阶梯峰值应力和震荡峰值应力,发现加载历史对于NiTi形状记忆合金塑性行为有显著影响。相较于恒定峰值应力,非恒定峰值应力可以引起更明显的NiTi形状记忆合金的超弹性劣化。
The effect of peak stress on the plastic behavior of NiTi shape memory alloy (SMA) under uniaxial cyclic loading was studied. Taking into account the actual conditions, the experimental analysis of the peak strain, residual strain and dissipation energy of NiTi shape memory alloy under three stress conditions (constant peak stress, step peak stress and peak stress) was carried out. For constant peak stress, it is found that the higher the peak stress, the more obvious the hyperelastic degradation of NiTi shape memory alloy. For the peak peak stress and the peak peak stress, it is found that the loading history has a significant effect on the plastic behavior of NiTi shape memory alloy. In contrast to constant peak stress, unsteady peak stress can cause more pronounced super-elastic deterioration of NiTi shape memory alloys.