Crack instability of ferroelectric solids under alternative electric   loading

doi:10.1016/j.jmps.2015.04.014

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	Crack instability of ferroelectric solids under alternative electric loading
	Chen Hao-Sen ; Wang He-Ling ; Pei Yong-Mao ; Wei Yu-Jie ; Liu Bin ; Fang Dai-Ning
刊名	JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
	2015
关键词	Electro-thermal-mechanical coupling Crack instability Ferroelectric materials Safe operating area LEAD-ZIRCONATE-TITANATE CONDUCTING CRACK CERAMICS DRIVEN SINGLE-CRYSTALS GROWTH FATIGUE FIELD PROPAGATION TIP ACTUATORS
DOI	10.1016/j.jmps.2015.04.014
英文摘要	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.; National Natural Science Foundation of China [11302260, 11090330, 11090331, 11072003, 11272222]; National Basic Research Program of China [G2010CB832701]; SCI(E); EI; ARTICLE; liubin@tsinghua.edu.cn; fangdn@pku.edu.cn; 75-90; 81
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/417812]
专题	工学院
推荐引用方式 GB/T 7714	Chen Hao-Sen,Wang He-Ling,Pei Yong-Mao,et al. Crack instability of ferroelectric solids under alternative electric loading[J]. JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS,2015.
APA	Chen Hao-Sen,Wang He-Ling,Pei Yong-Mao,Wei Yu-Jie,Liu Bin,&Fang Dai-Ning.(2015).Crack instability of ferroelectric solids under alternative electric loading.JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS.
MLA	Chen Hao-Sen,et al."Crack instability of ferroelectric solids under alternative electric loading".JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS (2015).