Averaging Models for Heterogeneous Viscoplastic and Elastic Viscoplastic Materials  

Oleh:

Molinari, Alain

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Engineering Materials and Technology vol. 124 no. 1 (2002), page 62-70.
Topik: MATERIALS; models; heterogeneous viscoplastic; elastic viscoplastic; materials

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ87.3 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

Averaging models are proposed for viscoplastic and elastic - viscoplastic heterogeneous materials. The case of rigid viscoplastic materials is first discussed. Large deformations are considered. A first class of models is based on different linearizations of the nonlinear local response. A second class of models is obtained from approximate solutions of the nonlinear Eshelby problem. In this problem, an ellipsoid with uniform non linear properties is embedded in an infinite homogeneous matrix. An approximate solution is obtained by approaching the matrix behavior with an affine response. Using this solution of the nonlinear Eshelby problem, the average strain rate is calculated in each phase of the composite material, each phase being represented by an ellipsoid embedded in an infinite reference medium. By adequate choices of the reference medium, different averaging models are obtained (self - consistent scheme, nonlinear Mori Tanaka model). Finally, elasticity is included in the modelling, but with a restriction to small deformations.

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