Toughness Of Ni/Al2O3 Interfaces As Dependent On Micron-Scale Plasticity And Atomistic-Scale Separation
文献类型：期刊论文
| 作者 | Wei YG(魏悦广) ; Hutchinson JW
|
| 刊名 | Philosophical Magazine
 |
| 出版日期 | 2008 |
| 卷号 | 88期号:30-32页码:3841-3859 |
| 通讯作者邮箱 | hutchinson@husm.harvard.edu |
| 关键词 | Fracture Plasticity Work Of Separation Atomistic Separation Ceramic-Metal Interface Strain Gradient Plasticity Thermal Barrier Systems Crack-Growth Fracture Cleavage Indentation Resistance Mechanics Solids Models |
| ISSN号 | 1478-6435 |
| 通讯作者 | Hutchinson, JW (reprint author), Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA. |
| 合作状况 | 国际 |
| 中文摘要 | Ceramic/metal interfaces were studied that fail by atomistic separation accompanied by plastic dissipation in the metal. The macroscopic toughness of the specific Ni alloy/Al2O3 interface considered is typically on the order of ten times the atomistic work of separation in mode I and even higher if combinations of mode I and mode II act on the interface. Inputs to the computational model of interface toughness are: (i) strain gradient plasticity applied to the Ni alloy with a length parameter determined by an indentation test, and (ii) a potential characterizing mixed mode separation of the interface fit to atomistic results. The roles of the several length parameters in the strain gradient plasticity are determined for indentation and crack growth. One of the parameters is shown to be of dominant importance, thus establishing that indentation can be used to measure the relevant length parameter. Recent results for separation of Ni/Al2O3 interfaces computed by atomistic methods are reviewed, including a set of results computed for mixed mode separation. An approximate potential fit to these results is characterized by the work of separation, the peak separation stress for normal separation and the traction-displacement relation in pure shearing of the interface. With these inputs, the model for steady-state crack growth is used to compute the toughness of the interface under mode I and under the full range of mode mix. The effect of interface strength and the work of separation on macroscopic toughness is computed. Fundamental implications for plasticity-enhanced toughness emerge. |
| 学科主题 | 损伤、破坏机理和微结构演化 |
| 类目[WOS] | Materials Science, Multidisciplinary ; Mechanics ; Metallurgy & Metallurgical Engineering ; Physics, Applied ; Physics, Condensed Matter |
| 研究领域[WOS] | Materials Science ; Mechanics ; Metallurgy & Metallurgical Engineering ; Physics |
| 关键词[WOS] | STRAIN GRADIENT PLASTICITY ; THERMAL BARRIER SYSTEMS ; CRACK-GROWTH ; FRACTURE ; CLEAVAGE ; INDENTATION ; RESISTANCE ; MECHANICS ; SOLIDS ; MODELS |
| 收录类别 | SCI ; EI |
| 原文出处 | http://dx.doi.org/10.1080/14786430802311092 |
| 语种 | 英语 |
| WOS记录号 | WOS:000261804000020 |
| 公开日期 | 2009-08-03 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/25804]  |
| 专题 | 力学研究所_力学所知识产出(1956-2008) |
| 推荐引用方式 GB/T 7714 | Wei YG,Hutchinson JW. Toughness Of Ni/Al2O3 Interfaces As Dependent On Micron-Scale Plasticity And Atomistic-Scale Separation[J]. Philosophical Magazine,2008,88(30-32):3841-3859. |
| APA | Wei YG,&Hutchinson JW.(2008).Toughness Of Ni/Al2O3 Interfaces As Dependent On Micron-Scale Plasticity And Atomistic-Scale Separation.Philosophical Magazine,88(30-32),3841-3859. |
| MLA | Wei YG,et al."Toughness Of Ni/Al2O3 Interfaces As Dependent On Micron-Scale Plasticity And Atomistic-Scale Separation".Philosophical Magazine 88.30-32(2008):3841-3859. |
入库方式： OAI收割
来源：力学研究所
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