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.
Source PublicationJOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
2015-08
Volume81Pages:75-90
ISSN0022-5096
AbstractThe 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.
KeywordElectro-thermal-mechanical Coupling Crack Instability Ferroelectric Materials Safe Operating Area
Subject AreaMaterials Science ; Mechanics ; Physics
DOI10.1016/j.jmps.2015.04.014
URL查看原文
Indexed BySCI ; EI
Language英语
WOS IDWOS:000358470300005
WOS Research AreaMaterials Science ; Mechanics ; Physics
WOS SubjectMaterials Science, Multidisciplinary ; Mechanics ; Physics, Condensed Matter
Funding OrganizationNational Natural Science Foundation of China [11302260, 11090330, 11090331, 11072003, 11272222] ; National Basic Research Program of China [G2010CB832701]
DepartmentLNM微结构计算力学(筹)
Classification一类
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/55327
Collection非线性力学国家重点实验室
Corresponding AuthorLiu, B (reprint author), Tsinghua Univ, Dept Engn Mech, Beijing 100084, Peoples R China.
Recommended Citation
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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