Crack instability of ferroelectric solids under alternative electric loading

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	Crack instability of ferroelectric solids under alternative electric loading
	Chen HS; Wang HL; Pei YM; Wei YJ(魏宇杰); Liu B; Fang DN
刊名	JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
	2015-08
通讯作者邮箱	liubin@tsinghua.edu.cn ; fangdn@pku.edu.cn
卷号	81 页码:75-90
关键词	Electro-thermal-mechanical coupling Crack instability Ferroelectric materials Safe operating area
ISSN号	0022-5096
通讯作者	Liu, B (reprint author), Tsinghua Univ, Dept Engn Mech, Beijing 100084, Peoples R China.
产权排序	[Chen Hao-Sen; Wang He-Ling; Liu Bin] Tsinghua Univ, Dept Engn Mech, Beijing 100084, Peoples R China; [Pei Yong-Mao; Fang Dai-Ning] Peking Univ, LTCS, Beijing 100871, Peoples R China; [Pei Yong-Mao; Fang Dai-Ning] Peking Univ, Coll Engn, Beijing 100871, Peoples R China; [Wei Yu-Jie] Chinese Acad Sci, LNM, Inst Mech, Beijing 100190, Peoples R China
中文摘要	The low fracture toughness of the widely used piezoelectric and ferroelectric materials in technological applications raises a big concern about their durability and safety. Up to now, the mechanisms of electric-field induced fatigue crack growth in those materials are not fully understood. Here we report experimental observations that alternative electric loading at high frequency or large amplitude gives rise to dramatic temperature rise at the crack tip of a ferroelectric solid. The temperature rise subsequently lowers the energy barrier of materials for domain switch in the vicinity of the crack tip, increases the stress intensity factor and leads to unstable crack propagation finally. In contrast, at low frequency or small amplitude, crack tip temperature increases mildly and saturates quickly, no crack growth is observed. Together with our theoretical analysis on the non-linear heat transfer at the crack tip, we constructed a safe operating area curve with respect to the frequency and amplitude of the electric field, and validated the safety map by experiments. The revealed mechanisms about how electro-thermal-mechanical coupling influences fracture can be directly used to guide the design and safety assessment of piezoelectric and ferroelectric devices. (C) 2015 Elsevier Ltd. All rights reserved.
学科主题	Materials Science ; Mechanics ; Physics
分类号	一类
类目[WOS]	Materials Science, Multidisciplinary ; Mechanics ; Physics, Condensed Matter
研究领域[WOS]	Materials Science ; Mechanics ; Physics
收录类别	SCI ; EI
原文出处	http://dx.doi.org/10.1016/j.jmps.2015.04.014
语种	英语
WOS记录号	WOS:000358470300005
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/55327]
专题	力学研究所_非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Chen HS,Wang HL,Pei YM,et al. Crack instability of ferroelectric solids under alternative electric loading[J]. JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS,2015,81:75-90.
APA	Chen HS,Wang HL,Pei YM,Wei YJ,Liu B,&Fang DN.(2015).Crack instability of ferroelectric solids under alternative electric loading.JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS,81,75-90.
MLA	Chen HS,et al."Crack instability of ferroelectric solids under alternative electric loading".JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS 81(2015):75-90.