超弹性NiTi合金在应力控制循环载荷下会产生峰值应变和谷值应变的循环累积--相变棘轮行为.室温实验表明,峰值应变和谷值应变的演化规律与加载应力水平和加载波形密切相关;同时,在循环加载过程中,随着循环周次的增加,奥氏体名义弹性模量减小,马氏体名义弹性模量增大,奥氏体向马氏体转变的名义开始应力下降,耗散能降低,并在一定的循环次数下趋于一个稳定值.研究得到了一些有助于后续建立超弹性循环本构模型的结论.
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