Creep cavitation evolution in polycrystalline copper under conditions of stress relaxation

Creep cavitation evolution in polycrystalline copper under conditions of stress relaxation
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应力松弛条件下多晶铜的蠕变空化演化

DOI:
10.1016/j.msea.2023.144784
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发表时间:
2023
期刊:
A
影响因子:
--
通讯作者:
Shang H
Shang H
中科院分区:
--
文献类型:
--
作者:
Shang H

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在过去的一个世纪里,人们对金属和合金的蠕变进行了广泛的观察和研究。大多数研究都是基于恒定负载,或者较少基于恒定应力条件。在使用期间的某些应力状态下,例如蠕变疲劳(循环),以及在位移控制载荷下,应力可以松弛。本文使用具有恒定位移的新型毫米长度尺度梁弯曲几何测试样本来模拟应力松弛并探索模型多晶材料(即无氧高导铜)中的空腔成核和早期生长/闭合。已经探讨了在 43μm–2350μm 范围内改变晶粒尺寸的作用。采用幂律蠕变理论模型和有限元分析来预测蠕变松弛并解释测试条件下的空腔成核和早期生长/闭合。结果与实验观察结果进行了比较。总体实验和建模结果是根据潜在的蠕变损伤机制来考虑的。
Creep in metals and alloys has been observed and studied extensively over the past century. Most studies are based on constant load or less frequently on constant stress conditions. Under certain stress regimes during the period of service, such as creep-fatigue (cyclic), and under displacement-controlled loading the stress can relax. This paper uses novel millimetre length-scale beam bend geometry test specimens with constant displacement to simulate stress relaxation and explore cavity nucleation and early-stage growth/closure in a model polycrystalline material, namely oxygen-free high-conductivity copper. The role of changing grain size over the range 43 μm–2350 μm has been explored. Power-law creep theoretical modelling and finite element analyses have been adopted to predict creep relaxation and explain cavity nucleation and early-stage growth/closure for the test conditions. The results are compared with the experimental observations. The overall experimental and modelling outcomes are considered with respect to the underlying creep damage mechanism.
DOI: 10.1179/030634571790439757
发表时间: 1971-01
期刊: Metal Science Journal
影响因子: --
作者:
W. Beeré;G. W. Greenwood
通讯作者: W. Beeré;G. W. Greenwood
细晶粒 0·5Cr–0·5Mo–0·25V 和粗晶粒 1Cr–0·5Mo 钢的多轴蠕变
DOI: 10.1179/mst.1991.7.8.707
发表时间: 1991
影响因子: 1.8
作者:
R. Browne;P. Flewitt;Deryle W. Lonsdale;M. Shammas;J. Sao
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DOI: 10.1038/214586a0
发表时间: 1967
期刊: Nature
影响因子: 64.8
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金属中小空隙的平衡形式
DOI: 10.1016/0039-6028(77)90379-x
发表时间: 1977
期刊: Surface Science
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DOI: --
发表时间: 1984
期刊:
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作者:
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通讯作者: H. Riedel