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| Toughness Of Ni/Al2O3 Interfaces As Dependent On Micron-Scale Plasticity And Atomistic-Scale Separation | |
Wei YG(魏悦广) ; Hutchinson JW; Hutchinson, JW (reprint author), Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA.
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| Source Publication | Philosophical Magazine
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| 2008 | |
| Volume | 88Issue:30-32Pages:3841-3859 |
| ISSN | 1478-6435 |
| Abstract | 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. |
| Keyword | 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 |
| Subject Area | 损伤、破坏机理和微结构演化 |
| DOI | 10.1080/14786430802311092 |
| URL | 查看原文 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000261804000020 |
| WOS Keyword | STRAIN GRADIENT PLASTICITY ; THERMAL BARRIER SYSTEMS ; CRACK-GROWTH ; FRACTURE ; CLEAVAGE ; INDENTATION ; RESISTANCE ; MECHANICS ; SOLIDS ; MODELS |
| WOS Research Area | Materials Science ; Mechanics ; Metallurgy & Metallurgical Engineering ; Physics |
| WOS Subject | Materials Science, Multidisciplinary ; Mechanics ; Metallurgy & Metallurgical Engineering ; Physics, Applied ; Physics, Condensed Matter |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/25804 |
| Collection | 力学所知识产出(1956-2008) |
| Corresponding Author | Hutchinson, JW (reprint author), Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA. |
| Recommended Citation GB/T 7714 | Wei YG,Hutchinson JW,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,&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. |
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