Fatigue Property of Additively Manufactured Ti-6Al-4V under Nonproportional Multiaxial Loading

Abstract The low cycle fatigue strength properties of the additively manufactured Ti-6Al-4V alloy are experimentally investigated under proportional and nonproportional multiaxial loading. The fatigue tests were conducted using hollow cylinder specimens with and without heat treatments, at room temp...

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Autores principales:	Yuya Kimura, Fumio Ogawa, Takamoto Itoh
Formato:	article
Lenguaje:	EN
Publicado:	SpringerOpen 2021
Materias:	Additive manufacturing Ti-6Al-4V Low cycle fatigue Multiaxial stress Nonproportional loading Internal defect Ocean engineering TC1501-1800 Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/539cf99bdc6444a18757ed6f1e7e0ea6
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spelling	oai:doaj.org-article:539cf99bdc6444a18757ed6f1e7e0ea62021-11-14T12:05:54ZFatigue Property of Additively Manufactured Ti-6Al-4V under Nonproportional Multiaxial Loading10.1186/s10033-021-00626-81000-93452192-8258https://doaj.org/article/539cf99bdc6444a18757ed6f1e7e0ea62021-11-01T00:00:00Zhttps://doi.org/10.1186/s10033-021-00626-8https://doaj.org/toc/1000-9345https://doaj.org/toc/2192-8258Abstract The low cycle fatigue strength properties of the additively manufactured Ti-6Al-4V alloy are experimentally investigated under proportional and nonproportional multiaxial loading. The fatigue tests were conducted using hollow cylinder specimens with and without heat treatments, at room temperature in air. Two fatigue tests were conducted: one for proportional loading and one for nonproportional loading. The proportional loading was represented by a push-pull strain path (PP) and the nonproportional loading by a circle strain path (CI). The failure lives of the additively manufactured specimens were clearly reduced drastically by internal voids and defects. However, the sizes of the defects were measured, and the defects were found not to cause a reduction in fatigue strength above a critical size. The fracture surface was observed using scanning electron microscopy to investigate the fracture mechanisms of the additively manufactured specimens under the two types of strain paths. Different fracture patterns were recognized for each strain paths; however, both showed retention of the crack propagation, despite the presence of numerous defects, probably because of the interaction of the defects. The crack propagation properties of the materials with numerous defects under nonproportional multiaxial loading were clarified to increase the reliability of the additively manufactured components.Yuya KimuraFumio OgawaTakamoto ItohSpringerOpenarticleAdditive manufacturingTi-6Al-4VLow cycle fatigueMultiaxial stressNonproportional loadingInternal defectOcean engineeringTC1501-1800Mechanical engineering and machineryTJ1-1570ENChinese Journal of Mechanical Engineering, Vol 34, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Additive manufacturing Ti-6Al-4V Low cycle fatigue Multiaxial stress Nonproportional loading Internal defect Ocean engineering TC1501-1800 Mechanical engineering and machinery TJ1-1570
spellingShingle	Additive manufacturing Ti-6Al-4V Low cycle fatigue Multiaxial stress Nonproportional loading Internal defect Ocean engineering TC1501-1800 Mechanical engineering and machinery TJ1-1570 Yuya Kimura Fumio Ogawa Takamoto Itoh Fatigue Property of Additively Manufactured Ti-6Al-4V under Nonproportional Multiaxial Loading
description	Abstract The low cycle fatigue strength properties of the additively manufactured Ti-6Al-4V alloy are experimentally investigated under proportional and nonproportional multiaxial loading. The fatigue tests were conducted using hollow cylinder specimens with and without heat treatments, at room temperature in air. Two fatigue tests were conducted: one for proportional loading and one for nonproportional loading. The proportional loading was represented by a push-pull strain path (PP) and the nonproportional loading by a circle strain path (CI). The failure lives of the additively manufactured specimens were clearly reduced drastically by internal voids and defects. However, the sizes of the defects were measured, and the defects were found not to cause a reduction in fatigue strength above a critical size. The fracture surface was observed using scanning electron microscopy to investigate the fracture mechanisms of the additively manufactured specimens under the two types of strain paths. Different fracture patterns were recognized for each strain paths; however, both showed retention of the crack propagation, despite the presence of numerous defects, probably because of the interaction of the defects. The crack propagation properties of the materials with numerous defects under nonproportional multiaxial loading were clarified to increase the reliability of the additively manufactured components.
format	article
author	Yuya Kimura Fumio Ogawa Takamoto Itoh
author_facet	Yuya Kimura Fumio Ogawa Takamoto Itoh
author_sort	Yuya Kimura
title	Fatigue Property of Additively Manufactured Ti-6Al-4V under Nonproportional Multiaxial Loading
title_short	Fatigue Property of Additively Manufactured Ti-6Al-4V under Nonproportional Multiaxial Loading
title_full	Fatigue Property of Additively Manufactured Ti-6Al-4V under Nonproportional Multiaxial Loading
title_fullStr	Fatigue Property of Additively Manufactured Ti-6Al-4V under Nonproportional Multiaxial Loading
title_full_unstemmed	Fatigue Property of Additively Manufactured Ti-6Al-4V under Nonproportional Multiaxial Loading
title_sort	fatigue property of additively manufactured ti-6al-4v under nonproportional multiaxial loading
publisher	SpringerOpen
publishDate	2021
url	https://doaj.org/article/539cf99bdc6444a18757ed6f1e7e0ea6
work_keys_str_mv	AT yuyakimura fatiguepropertyofadditivelymanufacturedti6al4vundernonproportionalmultiaxialloading AT fumioogawa fatiguepropertyofadditivelymanufacturedti6al4vundernonproportionalmultiaxialloading AT takamotoitoh fatiguepropertyofadditivelymanufacturedti6al4vundernonproportionalmultiaxialloading
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Fatigue Property of Additively Manufactured Ti-6Al-4V under Nonproportional Multiaxial Loading

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