Fatigue and ratcheting behaviors of CP-Ti at room temperature
Fatigue and ratcheting behaviors of CP-Ti at room temperature
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CP-Ti 室温下的疲劳和棘轮行为
DOI：
10.1016/j.msea.2013.10.063
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发表时间：
2014-01
期刊：
影响因子：
6.4
通讯作者：
Jian Peng, Chang-Yu Zhou, Qiao Dai, Xiao-Hua He,
中科院分区：
文献类型：
--
作者：
Jian Peng, Chang-Yu Zhou, Qiao Dai, Xiao-Hua He,
通过对工业纯钛（CP-Ti）室温应力控制疲劳行为的分析，从循环应变范围、棘轮应变、最小棘轮应变速率、棘轮失效应变和断口形貌等方面可以明显地区分出两个应力区。在高应力区，棘轮行为明显，破坏是由较大的棘轮变形引起的。而在低应力区，棘轮行为较弱，失效为典型的疲劳断裂，疲劳裂纹萌生、疲劳扩展和瞬间断裂。在高应力区，最大应力对棘轮行为和疲劳行为的影响大于应力幅值。相反，在低应力区，应力幅对疲劳性能的影响大于最大应力。但在低应力区棘轮行为仍受最大应力控制。通过对疲劳寿命预测模型的讨论，指出传统的Basquin模型和能量模型由于没有考虑棘轮效应，不能在较宽的应力范围内给出精确的疲劳寿命。疲劳损伤与棘轮损伤的耦合模型被证明是一个强大的预测。
Based on the careful analyses of the stress controlled fatigue behavior of commercially pure titanium (CP-Ti) at room temperature, two stress regions can be evidently identified by cycle strain range, ratcheting strain, min ratcheting strain rate, ratcheting failure strain and fracture morphologies. In the high stress region, the ratcheting behavior is significant, and the failure is caused by the large ratcheting deformation. However, in the low stress region, the ratcheting behavior is weak, and the failure is the typical fatigue fracture, with fatigue crack initiation, fatigue extension, and instant rupture. In the high stress region, for both ratcheting and fatigue behaviors, the influence of max stress is greater than stress amplitude. On the contrary, in the low stress region, the influence of stress amplitude on the fatigue behavior is greater than max stress. But the ratcheting behavior in the low stress region is still max stress controlled. Based on the discussion on the fatigue life prediction model, traditional Basquin model and energy based model cannot supply precise fatigue life in the wide stress range, since the ratcheting behavior is not considered. The coupled fatigue damage and ratcheting damage model is proved to make a robust prediction.
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影响因子：
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作者：
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影响因子：
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作者：
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作者：
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DOI：
10.1016/s0921-5093(98)00650-9
发表时间：
1998-08
影响因子：
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作者：
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通讯作者：
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