Crack instability of ferroelectric solids under alternative electric loading

doi:10.1016/j.jmps.2015.04.014

IMECH-IR > 非线性力学国家重点实验室

	Crack instability of ferroelectric solids under alternative electric loading
	Chen HS; Wang HL; Pei YM; Wei YJ(魏宇杰); Liu B; Fang DN; Liu, B (reprint author), Tsinghua Univ, Dept Engn Mech, Beijing 100084, Peoples R China.
发表期刊	JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
	2015-08
卷号	81 页码:75-90
ISSN	0022-5096
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.
关键词	Electro-thermal-mechanical Coupling Crack Instability Ferroelectric Materials Safe Operating Area
学科领域	Materials Science ; Mechanics ; Physics
DOI	10.1016/j.jmps.2015.04.014
URL	查看原文
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000358470300005
WOS研究方向	Materials Science ; Mechanics ; Physics
WOS类目	Materials Science, Multidisciplinary ; Mechanics ; Physics, Condensed Matter
项目资助者	National Natural Science Foundation of China [11302260, 11090330, 11090331, 11072003, 11272222] ; National Basic Research Program of China [G2010CB832701]
课题组名称	LNM微结构计算力学（筹）
论文分区	一类
引用统计	被引频次：16[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/55327
专题	非线性力学国家重点实验室
通讯作者	Liu, B (reprint author), Tsinghua Univ, Dept Engn Mech, Beijing 100084, Peoples R China.
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.,...&Liu, B .(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.

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