| Nature of crack-tip plastic zone in metallic glasses | |
| Chen Y(陈艳); Dai LH(戴兰宏); Dai, LH (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China. | |
| Source Publication | INTERNATIONAL JOURNAL OF PLASTICITY
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| 2016-02 | |
| Volume | 77Pages:54-74 |
| ISSN | 0749-6419 |
| Abstract | The fracture of metallic glasses(MGs) can be induced by shear banding in a ductile mode or by cavitation in a brittle way. Plastic zone in front of a crack tip, which is greatly involved with localized shear band, cavitation and the resultant fracture morphology, is a key clue to unveil the secrets of the intrinsic ductility and fracture. However, the characteristics of plastic zone, i.e., stress and strain distributions, size and shape, have not been clearly unraveled for MGs so far. In this paper, an analytical solution of the plastic zone for mode I crack under plane strain condition is derived through J-integral based on a slip line field analysis and shape approximation, by taking pressure-sensitivity, dilatancy, and structural evolution into account. Two length scales of the plastic zone, i.e. the maximum radius R-max and the radius along the crack line direction R-x, are revealed to control shear flow instability and cavitation, and therefore failure modes. According to shear transformation zone (STZ) based free volume evolution dynamics, the critical values of the mode I stress intensity factor and the plastic zone size at crack initiation are obtained. The effects of Poisson's ratio, pressure sensitivity, and dilatancy on the stress/strain distributions, and the size of plastic zone are elucidated. It is found that larger Poisson's ratio and smaller dilatancy lead to higher fracture toughness and 'slender' critical plastic zone, facilitating a good ductility. The internal correlations of the fracture pattern (i.e. dimple structure) with the plastic zone are established, where the size of the fracture pattern is quantitatively characterized by the critical length of plastic zone. To be further, a shape change of the critical plastic zone from 'slender' (apt to shear plastic flow) to 'chubby' (inclined to cavitation) is revealed with increasing dilatancy or decreasing Poisson's ratio, which might shed light on the underlying mechanism of ductile-to-brittle transition in MGs. (C) 2015 Elsevier Ltd. All rights reserved. |
| Keyword | Metallic Glass Crack Tip Plasticity Ductility Stress Intensity Factor Analytic Functions |
| DOI | 10.1016/j.ijplas.2015.10.004 |
| URL | 查看原文 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000370103200003 |
| WOS Keyword | 2 IMMISCIBLE LIQUIDS ; PIPELINE FLOW ; CRUDE-OIL ; SIZE DISTRIBUTION ; DROPLET SIZE ; VISCOSITY ; SURFACTANT ; LAMINAR |
| WOS Research Area | Engineering ; Materials Science ; Mechanics |
| WOS Subject | Engineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics |
| Funding Organization | The work is supported by the Nature Science Foundation of China (Grants Nos. 11572324, 11202221, 11132011 and 11472287), the National Basic Research Program of China (Grants No. 2012CB937500), and the CAS/SAFEA International Partnership Program for Creative Research Teams. |
| Department | LNM冲击动力学与新型材料力学性能 |
| Classification | 一类 |
| Ranking | True |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/58674 |
| Collection | 非线性力学国家重点实验室 |
| Corresponding Author | Dai, LH (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China. |
| Recommended Citation GB/T 7714 | Chen Y,Dai LH,Dai, LH . Nature of crack-tip plastic zone in metallic glasses[J]. INTERNATIONAL JOURNAL OF PLASTICITY,2016,77:54-74. |
| APA | Chen Y,Dai LH,&Dai, LH .(2016).Nature of crack-tip plastic zone in metallic glasses.INTERNATIONAL JOURNAL OF PLASTICITY,77,54-74. |
| MLA | Chen Y,et al."Nature of crack-tip plastic zone in metallic glasses".INTERNATIONAL JOURNAL OF PLASTICITY 77(2016):54-74. |
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| a2016-077.pdf（3580KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Download | |
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