Plasticity in heterogeneous metallic materials with small volumes is governed by the interactions of dislocations at interfaces. In particular, interfaces of a material confined in a small volume can strongly affect the mechanical properties of micro and nanosystems. In this paper, the framework of higher-order strain gradient plasticity theory with interfacial energy effect is used to investigate the coupling of interfacial energy with temperature and how it affects the initial yield strength (i.e., onset of plasticity) and the strain hardening rates of confined small metallic volumes. It is postulated that the interfacial energy decreases as temperature increases such that size effect decreases as temperature increases. As an application, the size effect of thermal loading of a film-substrate system is investigated. It is shown that the temperature at which the film starts to yield plastically is size-dependent, which is attributed to the size-dependent yield strength. Furthermore, the flow stress is more temperature sensitive as the size decreases.
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e-mail: rabualrub@civil.tamu.edu
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January 2011
Research Papers
Coupled Interfacial Energy and Temperature Effects on Size-Dependent Yield Strength and Strain Hardening of Small Metallic Volumes
Rashid K. Abu Al-Rub,
Rashid K. Abu Al-Rub
Zachry Department of Civil Engineering,
e-mail: rabualrub@civil.tamu.edu
Texas A&M University
, College Station, TX 77843
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Abu N. M. Faruk
Abu N. M. Faruk
Zachry Department of Civil Engineering,
Texas A&M University
, College Station, TX 77843
Search for other works by this author on:
Rashid K. Abu Al-Rub
Zachry Department of Civil Engineering,
Texas A&M University
, College Station, TX 77843e-mail: rabualrub@civil.tamu.edu
Abu N. M. Faruk
Zachry Department of Civil Engineering,
Texas A&M University
, College Station, TX 77843J. Eng. Mater. Technol. Jan 2011, 133(1): 011017 (7 pages)
Published Online: December 3, 2010
Article history
Received:
March 17, 2010
Revised:
August 12, 2010
Online:
December 3, 2010
Published:
December 3, 2010
Citation
Abu Al-Rub, R. K., and Faruk, A. N. M. (December 3, 2010). "Coupled Interfacial Energy and Temperature Effects on Size-Dependent Yield Strength and Strain Hardening of Small Metallic Volumes." ASME. J. Eng. Mater. Technol. January 2011; 133(1): 011017. https://doi.org/10.1115/1.4002651
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