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EFFECT OF SURFACE ENERGY ON DISLOCATION-INDUCED FIELD IN HALF-SPACE WITH APPLICATION TO THIN FILM-SUBSTRATE SYSTEMS

Acta Mechanica Solida Sinica 2009年第5期22卷 436-442页

作者： Ganyun Huang Bob Svendsen Zhixing Lu Institute of Mechanics Dortmund University of Technology 44221 Dortmund Germany Sehool of Mechanical Engineering Tianjin University Tianjin 300072 China Department of Mechanical Engineering University of Colorado at Boulder Colorado USA

In this work the elastic field of an edge dislocation in a half-space with the effect of surface energy has been obtained. The elastic field is then used to study the image force on the dislocation, the critical thickness for dislocation generation in epitaxial thin films with strain mismatch and the yielding strength of thin films on substrates. The results show that the image forces on the dislocation deviate from the conventional solutions when the distance of the dislocation from the free surface is smaller than several times of the characteristic length. Also due to the effect of surface energy, the critical thickness for dislocation generation is smaller than that predicted by the conventional elastic solutions and the extent of the deviation depends on the magnitude of mismatch strain. In contrast, the effect of surface energy on the yielding strength for many practical thin films can be neglected except for some soft ones where the characteristic length is comparable to the thickness.

关键词： thin film surface energy effect dislocation half-space critical thickness yielding strength

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An Overview on strength and Safety of Marine Structures

An Overview on Strength and Safety of Marine Structures

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第六届船舶力学学术委员会全体会议

作者： Cui Weicheng (China Ship Scientific Research Center)

The proceedings of ISSC 2006 have provided a comprehensive review on the strength and safety of marine structures including ships and offshore platforms. However, relevant information are distributed in many technical committee reports such as II.1 QUASI-STATIC RESPONSE, III.1 ULTIMATE strength, III.2 FATIGUE AND FRACTURE, IV.1 DESIGN PRINCIPLES AND CRITERIA, V.1 COLLISION AND GROUNDING, V.3 FABRICATION TECHNOLOGY, V.6 CONDITION ASSESSMENT OF AGED SHIPS. The purpose of this paper is to summarize the important information related to the current research status on strength and safety of marine structures.

关键词： ship structures offshore structures ultimate strength buckling strength yielding strength initial imperfections residual stresses in-service degradation fatigue corrosion crack propagation uncertainties reliability safety

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Effect of surface energy on the dislocation-half-space interaction and the implications in thin films on substrates

Effect of surface energy on the dislocation-half-space inter...

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损伤、断裂与微纳米力学学术研讨会

作者： Bob Svendsen Institute of Mechanics Dortmund University of Technology

In this paper,the elastic field of an edge dislocation in a half-space with the effect of surface energy is *** elastic field is then used to study the image force on the dislocation, the critical thickness for dislocation generation in epitaxial thin films with strain mismatch and the yielding strength of thin films on *** results show that the image forces on the dislocation deviate from the conventional solutions when the distance of the dislocation from the free surface is smaller than several times of the characteristic *** due to the effect of surface energy,the critical thickness for dislocation generation is smaller than predicted by the conventional elastic solutions and the extent of the deviation depends on the magnitude of mismatch *** contrast,the effect of surface energy on the yielding strength for many practical thin films can be neglected except for some soft ones where the characteristic length is comparable to the thickness.

关键词： Thin film Surface energy effect Dislocation Critical thickness yielding strength

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