Effects of notch geometry on stress-strain distribution, martensite transformation and fracture behavior in shape memory alloy NiTi

doi:10.1016/j.msea.2006.06.077

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	Effects of notch geometry on stress-strain distribution, martensite transformation and fracture behavior in shape memory alloy NiTi
	Wang, G. Z.
刊名	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
	2006-10-25
卷号	434 期号:1-2 页码:269-279
关键词	shape memory alloys stress-strain Martensite transformation notch geometry finite element analysis fracture
ISSN号	0921-5093
DOI	10.1016/j.msea.2006.06.077
英文摘要	In this paper, the stress-strain distributions and martensite transformation in three specimens with different notch geometries in a shape memory alloy NiTi are calculated by using finite element method (FEM), and their effects on fracture behaviors are analyzed. The results show that three characteristic loads, that is, starting load and finishing load of the martensite transformation and the beginning load of the plastic deformation occurring in the transformed martensite at crack/notch tips can be determined on the load-displacement curves calculated by the FEM. With increasing the notch acuity from blunt notch through acute notch to crack, the characteristic loads and the differences between them decrease. The stress-strain distributions exhibit different features at four load sections divided by the three characteristic loads. With the increase of the notch acuity the stress and strain at the crack/notch tips and their growing rate both increase. For producing the same full martensite zone in front of the crack/notch tips, the loads needed decrease with the increase of the notch acuity. The partial martensite zone size of the blunt notch specimen is larger than that of the acute crack/notch specimens. For the crack specimen, the plastic zone in the full martensite zone can form at a very low load, while for the blunt notch specimen a large load is needed to form the plastic zone. With increasing notch acuity from blunt notch through acute notch to crack. the sizes of the "fracture process zone" in front of the crack/notch tips decrease rapidly, and the crack propagation will change from unstable to stable manner. (c) 2006 Elsevier B.V. All rights reserved.
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000240896400038
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/35663]
专题	兰州理工大学材料科学与工程学院省部共建有色金属先进加工与再利用国家重点实验室
通讯作者	Wang, G. Z.
作者单位	Lanzhou Univ Technol, State Key Lab Gansu Adv Nonferrous Met Mat, Lanzhou 730050, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Wang, G. Z.. Effects of notch geometry on stress-strain distribution, martensite transformation and fracture behavior in shape memory alloy NiTi[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2006,434(1-2):269-279.
APA	Wang, G. Z..(2006).Effects of notch geometry on stress-strain distribution, martensite transformation and fracture behavior in shape memory alloy NiTi.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,434(1-2),269-279.
MLA	Wang, G. Z.."Effects of notch geometry on stress-strain distribution, martensite transformation and fracture behavior in shape memory alloy NiTi".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 434.1-2(2006):269-279.