Fatigue Crack Growth Behaviour of Precipitate-Strengthened CuNi<sub>2</sub>Si Alloy under Different Loading Modes

In this study, fatigue crack tests of CuNi<sub>2</sub>Si alloys using the replica technique under symmetrical tensile-compression loading, and rotational-bending loading were carried out with the same nominal stress amplitude. Observation and analysis results indicate that under differen...

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Main Authors:	Bing Yang, Yifan Li, Yahang Qin, Jiwang Zhang, Bo Feng, Zhen Liao, Shoune Xiao, Guangwu Yang, Tao Zhu
Format:	Article
Language:	English
Published:	MDPI AG 2020-05-01
Series:	Materials
Subjects:	Cu–Ni–Si alloy fatigue performance loading mode crack growth
Online Access:	https://www.mdpi.com/1996-1944/13/10/2228

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record_format	Article
spelling	doaj-fe56abdafc41449c8d738c59ac703c492020-11-25T02:37:42ZengMDPI AGMaterials1996-19442020-05-01132228222810.3390/ma13102228Fatigue Crack Growth Behaviour of Precipitate-Strengthened CuNi<sub>2</sub>Si Alloy under Different Loading ModesBing Yang0Yifan Li1Yahang Qin2Jiwang Zhang3Bo Feng4Zhen Liao5Shoune Xiao6Guangwu Yang7Tao Zhu8State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, ChinaState Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, ChinaState Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, ChinaState Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, ChinaState Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, ChinaState Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, ChinaState Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, ChinaState Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, ChinaState Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, ChinaIn this study, fatigue crack tests of CuNi<sub>2</sub>Si alloys using the replica technique under symmetrical tensile-compression loading, and rotational-bending loading were carried out with the same nominal stress amplitude. Observation and analysis results indicate that under different load types, the cracks display a trend of slow initiation growth and then rapid growth. The critical point is identified at the approximate value of 0.8 of the fatigue life fraction, and the crack growth rate of the sample under tensile-compression load is approximately an order of magnitude higher than that under rotational-bending load, resulting in the average life of the former being significantly shorter than the latter. Combining the observation results of the fractographical analysis and the surface-etched sample replica film, it can be seen that whether it is a tensile-compression load or a rotational-bending load, cracks mainly propagate in intergranular mode after initiation.https://www.mdpi.com/1996-1944/13/10/2228Cu–Ni–Si alloyfatigue performanceloading modecrack growth
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Bing Yang Yifan Li Yahang Qin Jiwang Zhang Bo Feng Zhen Liao Shoune Xiao Guangwu Yang Tao Zhu
spellingShingle	Bing Yang Yifan Li Yahang Qin Jiwang Zhang Bo Feng Zhen Liao Shoune Xiao Guangwu Yang Tao Zhu Fatigue Crack Growth Behaviour of Precipitate-Strengthened CuNi<sub>2</sub>Si Alloy under Different Loading Modes Materials Cu–Ni–Si alloy fatigue performance loading mode crack growth
author_facet	Bing Yang Yifan Li Yahang Qin Jiwang Zhang Bo Feng Zhen Liao Shoune Xiao Guangwu Yang Tao Zhu
author_sort	Bing Yang
title	Fatigue Crack Growth Behaviour of Precipitate-Strengthened CuNi<sub>2</sub>Si Alloy under Different Loading Modes
title_short	Fatigue Crack Growth Behaviour of Precipitate-Strengthened CuNi<sub>2</sub>Si Alloy under Different Loading Modes
title_full	Fatigue Crack Growth Behaviour of Precipitate-Strengthened CuNi<sub>2</sub>Si Alloy under Different Loading Modes
title_fullStr	Fatigue Crack Growth Behaviour of Precipitate-Strengthened CuNi<sub>2</sub>Si Alloy under Different Loading Modes
title_full_unstemmed	Fatigue Crack Growth Behaviour of Precipitate-Strengthened CuNi<sub>2</sub>Si Alloy under Different Loading Modes
title_sort	fatigue crack growth behaviour of precipitate-strengthened cuni<sub>2</sub>si alloy under different loading modes
publisher	MDPI AG
series	Materials
issn	1996-1944
publishDate	2020-05-01
description	In this study, fatigue crack tests of CuNi<sub>2</sub>Si alloys using the replica technique under symmetrical tensile-compression loading, and rotational-bending loading were carried out with the same nominal stress amplitude. Observation and analysis results indicate that under different load types, the cracks display a trend of slow initiation growth and then rapid growth. The critical point is identified at the approximate value of 0.8 of the fatigue life fraction, and the crack growth rate of the sample under tensile-compression load is approximately an order of magnitude higher than that under rotational-bending load, resulting in the average life of the former being significantly shorter than the latter. Combining the observation results of the fractographical analysis and the surface-etched sample replica film, it can be seen that whether it is a tensile-compression load or a rotational-bending load, cracks mainly propagate in intergranular mode after initiation.
topic	Cu–Ni–Si alloy fatigue performance loading mode crack growth
url	https://www.mdpi.com/1996-1944/13/10/2228
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Fatigue Crack Growth Behaviour of Precipitate-Strengthened CuNi<sub>2</sub>Si Alloy under Different Loading Modes

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