A semi-quantitative explanation of the cold dwell effect in titanium alloys

A semi-quantitative explanation of the cold dwell effect in titanium alloys
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钛合金冷驻效应的半定量解释

DOI:
10.1016/j.matdes.2020.108909
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发表时间:
2020-09
影响因子:
8.4
通讯作者:
Yang Rui
Yang Rui
中科院分区:
材料科学1区
文献类型:
--
作者:
Xi Guoqiang;Lei Jiafeng;Qiu Jianke;Ma Yingjie;Yang Rui

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近几十年来,冷保压疲劳已成为钛工业中的一个关键问题。尽管有报道强调了塑性应变随时间变化对钛合金冷保压效应的重要性,但由于塑性应变无论在正常循环疲劳还是保压疲劳中都是连续变化的,因此塑性应变与疲劳寿命之间的数学关系还没有得到讨论。本文设计了一系列恒定塑性应变下的疲劳试验,研究了室温空气中钛合金塑性应变与疲劳寿命之间的数学关系。结果表明,塑性应变对钛合金的疲劳寿命有明显的不利影响。与传统的定性机理不同,通过引入滞回能量密度,对钛合金的冷保压效应提出了一种半定量的解释。
Cold dwell fatigue has become one critical issue in titanium industry over the past decades. Though some reports have emphasized the importance of time-dependent plastic strain on cold dwell effect in titanium alloys, the mathematical relationship between plastic strain and fatigue life has never been discussed because plastic strain changes continuously no matter in normal cyclic fatigue or dwell fatigue. In this paper, a series of fatigue tests under constant plastic strain is designed to investigate the mathematical relationship between plastic strain and fatigue life in titanium alloys at room temperature in air. Results show that plastic strain has a definitely detrimental effect on fatigue life in titanium alloys. Different from the traditional qualitative mechanisms, one semi-quantitative explanation for cold dwell effect in titanium alloys is proposed by introducing hysteresis energy density.
高锰奥氏体TRIP/TWIP合金的低周和极低周疲劳行为:性能评估、损伤机制和寿命预测
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