【摘要】 对钛合金BT-9进行了单轴,比例及非比例加载低周疲劳试验研究,结果表明:BT-9的循环硬化的程度不明显,且其非比例附加强化程度较小.应变轨迹方向角ωε对疲劳寿命有较大影响,相同等效应变幅下,随着ωε增大,疲劳寿命增大.相同应变轨迹方向角ωε不同Mises等效应变强度下,随着等效应变强度的提高,疲劳寿命降低,表现为较好的线性对应关系.相同等效应变强度下,非比例疲劳寿命远低于比例加载下的疲劳寿命.更多还原

【Abstract】 The test were performed for BT-9 under uniaxial and multiaxial proportional and non-proportional LCF,the results reveal that cyclic harden of BT-9 is not obvious,and non-proportional cycle additional hardening is little.Orientation angle of strain track ω_ε has great influence on fatigue life which increases,with ω_ε increasing under the same equivalent strain intensity.For the same orientation angle of strain track and different Mises equivalent strain intensity,with equivalent strain intensity improve,fatigue life reduces,showing better linear corresponding relation.Under the same equivalent strain intensity,the fatigue life of non-proportion is less than that of proportion.更多还原