Functional Fatigue of Polycrystalline Cu-Al-Mn Superelastic Alloy Bars under Cyclic Tension
Functional Fatigue of Polycrystalline Cu-Al-Mn Superelastic Alloy Bars under Cyclic Tension
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DOI：
10.1061/(asce)mt.1943-5533.0001417
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发表时间：
2016-05
影响因子：
3.2
通讯作者：
K. Shrestha;Y. Araki;Tomoe Kusama;T. Omori;R. Kainuma
中科院分区：
文献类型：
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作者：
K. Shrestha;Y. Araki;Tomoe Kusama;T. Omori;R. Kainuma
本文研究了Cu-Al-Mn超弹性合金（SEA）棒材在室温下对反复拉伸载荷的响应。测试样品是三个多晶和一个单晶SEA棒，直径为11 mm，长度为100 mm。施加应变控制拉伸载荷1，000次循环，目标应变振幅为6- 7%。在试验中，监测应力-应变曲线、恢复应变、弹性模量、正向转变应力和阻尼比的变化。所有棒均表现出功能性疲劳，或超弹性逐渐丧失，但在加载循环结束时未发生断裂。在没有任何预先训练的情况下，观察到高达50-100次循环的完全应变恢复，而在这些循环期间观察到正向转变应力略微降低。然后，观察到应力平台逐渐丧失，残余应变逐渐增加，直至200-400次循环。之后，观察到接近线性的响应。显微结构和质地分析表明，这两个...
AbstractThis paper studies the response of Cu-Al-Mn superelastic alloy (SEA) bars to repeated tensile load at room temperature. The test specimens are three polycrystalline and one single crystal SEA bars of 11 mm diameter and 100 mm length. Strain-controlled tensile load is applied for 1,000 cycles with target strain amplitudes of 6–7%. In the test, variations are monitored in the stress-strain curve, recovery strain, elastic modulus, forward transformation stress, and damping ratio. All bars showed functional fatigue, or gradual loss of superelasticity, while they did not fracture by the end of the loading cycles. Full strain recovery was observed up to 50–100 cycles without any training beforehand, while a slight decrease of forward transformation stress was observed during these cycles. Then, a gradual loss of stress plateau and gradual increase of residual strain were observed up to 200–400 cycles. Afterward, a nearly linear response was observed. Microstructure and texture analyses suggest that both...