The definition and magnitude of the intrinsic length scale are keys to the development of the theory of plasticity that incorporates size effects. Gradient plasticity theory with a material length scale parameter is successfully in capturing the size dependence of material behavior at the micron scale. However, a fixed value of the material length-scale is not always realistic and that different problems could require different values. Moreover, a linear coupling between the local and non-local terms in the gradient plasticity theory is not always realistic and that different problems could require different couplings. A generalized gradient plasticity model with a non-fixed length scale parameter is proposed. This model assesses the sensitivity of predictions in the way in which the local and non-local parts are coupled. The proposed model gives good predictions of the size effect in micro-bending tests of thin films and micro-torsion tests of thin wires.
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ASME 2004 International Mechanical Engineering Congress and Exposition
November 13–19, 2004
Anaheim, California, USA
Conference Sponsors:
- Microelectromechanical Systems Division
ISBN:
0-7918-4714-4
PROCEEDINGS PAPER
A Modified Gradient Plasticity Theory for Micro-Bending and Micro-Torsion Size Effects
George Z. Voyiadjis,
George Z. Voyiadjis
Louisiana State University
Search for other works by this author on:
Rashid K. Abu Al-Rub
Rashid K. Abu Al-Rub
Louisiana State University
Search for other works by this author on:
George Z. Voyiadjis
Louisiana State University
Rashid K. Abu Al-Rub
Louisiana State University
Paper No:
IMECE2004-61745, pp. 233-242; 10 pages
Published Online:
March 24, 2008
Citation
Voyiadjis, GZ, & Abu Al-Rub, RK. "A Modified Gradient Plasticity Theory for Micro-Bending and Micro-Torsion Size Effects." Proceedings of the ASME 2004 International Mechanical Engineering Congress and Exposition. Microelectromechanical Systems. Anaheim, California, USA. November 13–19, 2004. pp. 233-242. ASME. https://doi.org/10.1115/IMECE2004-61745
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