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On the Role of Plasticity Length Scale Parameters in Multi-Scale Modeling

Lou, J. / Shrotriya, P. / Allameh, S. / Buchheit, T. / Soboyejo, W. O.

Abstract This chapter presents a recent study of the effects of plasticity strain gradient length scale parameters on the plastic deformation of LIGA Ni MEMS structures plated from sulfamate baths. Micro-tensile experiments were explored in current study to evaluate the basic tensile properties for LIGA Ni MEMS structures at micron scale. The composite length scale parameter [1] was obtained from the micro-bend techniques, and the stretch gradient length scale parameter [1–4] was extracted from the nano-indentation experiments. A constitutive expression, which is an extension of the traditional J2 theory, was obtained for the LIGA Ni MEMS structures. This constitutive equation can be used for the further modeling of plasticity of LIGA Ni MEMS structures plated under similar conditions. The implications of plasticity length scale parameters are discussed for multi scale modeling between the micron- and nano-scales.

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On the Role of Plasticity Length Scale Parameters in Multi-Scale Modeling

Lou, J. / Shrotriya, P. / Allameh, S. / Buchheit, T. / Soboyejo, W. O.

Abstract This chapter presents a recent study of the effects of plasticity strain gradient length scale parameters on the plastic deformation of LIGA Ni MEMS structures plated from sulfamate baths. Micro-tensile experiments were explored in current study to evaluate the basic tensile properties for LIGA Ni MEMS structures at micron scale. The composite length scale parameter [1] was obtained from the micro-bend techniques, and the stretch gradient length scale parameter [1–4] was extracted from the nano-indentation experiments. A constitutive expression, which is an extension of the traditional J2 theory, was obtained for the LIGA Ni MEMS structures. This constitutive equation can be used for the further modeling of plasticity of LIGA Ni MEMS structures plated under similar conditions. The implications of plasticity length scale parameters are discussed for multi scale modeling between the micron- and nano-scales.

On the Role of Plasticity Length Scale Parameters in Multi-Scale Modeling

Lou, J. / Shrotriya, P. / Allameh, S. / Buchheit, T. / Soboyejo, W. O.

Abstract This chapter presents a recent study of the effects of plasticity strain gradient length scale parameters on the plastic deformation of LIGA Ni MEMS structures plated from sulfamate baths. Micro-tensile experiments were explored in current study to evaluate the basic tensile properties for LIGA Ni MEMS structures at micron scale. The composite length scale parameter [1] was obtained from the micro-bend techniques, and the stretch gradient length scale parameter [1–4] was extracted from the nano-indentation experiments. A constitutive expression, which is an extension of the traditional J2 theory, was obtained for the LIGA Ni MEMS structures. This constitutive equation can be used for the further modeling of plasticity of LIGA Ni MEMS structures plated under similar conditions. The implications of plasticity length scale parameters are discussed for multi scale modeling between the micron- and nano-scales.

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Title:

On the Role of Plasticity Length Scale Parameters in Multi-Scale Modeling

Contributors:

Lou, J. (author) / Shrotriya, P. (author) / Allameh, S. (author) / Buchheit, T. (author) / Soboyejo, W. O. (author)

Published in:

Trends in Nanoscale Mechanics ; 147-166

ICASE/LaRC Interdisciplinary Series in Science and Engineering ; 9

Publication date:

2003-01-01

Size:

20 pages

ISBN:

978-90-481-6479-0 , 978-94-017-0385-7

ISSN:

DOI:

https://doi.org/10.1007/978-94-017-0385-7_6

Type of media:

Article/Chapter (Book)

Type of material:

Electronic Resource

Language:

English

Keywords:

multi-scale models , MEMS , Plasticity , nano-indentation , length scales Engineering , Nanotechnology and Microengineering , Materials Science, general , Electronics and Microelectronics, Instrumentation , Characterization and Evaluation of Materials , Mechanics , Engineering, general

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