采用径向应变控制法, 在MTS880/810试验机上用d13mm×1.5mm的单相α-Ti合金管材, 在(350±1)℃下进行了5个不同应变量的高温低周疲劳(HTLCF)实验; 记录了各自的循环应力-应变滞后环, 得出了试样的循环响应特征和各试样的高温低周疲劳寿命.对实验数据按Coffin-Manson公式拟合出疲劳曲线方程, 从而绘出了该试材的Δεt-2Nf倍寿命关系曲线.考虑到低周疲劳数据的离散性, 对其中的Δεt=1.0%和Δεt=1.5%两个应变量的各6个试验数据按双参数Weibull分布进行了统计分析.
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