单多轴变幅加载下TC21钛合金疲劳特性

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The fatigue properties of TC21 Ti-alloy for thin-wall tube specimen are investigated under uniaxial, tension-torsion propor- tional, non-proportional and variable amplitude loading. All tests are strain-controlled. The results indicate that cyclic softening behavior is shown for TC21 alloy under uniaxial and proportional tension-torsion constant amplitude loading, and the cyclic softening is more obvious under large strain amplitude loading. The large strain loading followed by small strain loading under non-proportional loading, shows that the cyclic hardening for tension stress is responded in the smaller strain loading stage due to the previous larger strain loading strengthening for tensional properties.在应变载荷控制下对TC21钛合金薄壁管光滑试件进行单轴、拉一扭比例、非比例恒幅、变幅加载试验，研究其疲劳行为。研究表明，TC21钛合金在单轴和多轴比例恒幅载荷下均表现为循环软化，并且应变载荷水平越大软化越明显。非比例变幅加载时，前期的大应变载荷对材料的轴向拉压特性具有强化作用，使得后期小应变载荷下的循环特性出现硬化现象。