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Identification of the Bodner Partom Model for Special Granular Structures : Preliminary Approach

Zalewski R., Skalski P.

Machine Dynamics Problems

2008

Vol. 32, No. 2

119-127

This work deals with new "smart systems" that are based on granular materials. These systems consist of a tight flexible sleeve, which is filled with a granular material. The air is then pumped out of the sleeve, causing underpressure, compressing the granules and so making the system more rigid and changing its damping characteristics. This allows for quick, easy, and inexpensive controls of the damping and stiffness of such systems. The aim of this paper is to present the experimental results of uniaxial tests of a sleeve filled with granular materials. These results support the modeling of such a system filled with a granular material using the Bodner-Partom viscoplastic constitutive law.

Application of elasto-viscoplastic Bodner-Partom constitutive equations in finite element analysis

Ambroziak A.

Computer Assisted Mechanics and Engineering Sciences

2007

Vol. 14, No. 3

405-429

A finite element implementation of the unified elasto-viscoplastic theory of Bodner–Partom for non-linear analysis is investigated in detail. Description of the Bodner–Partom constitutive equations is presented. Proposed UVSCPL procedure has been applied into MSC.Marc system and can be introduced into wide range of different finite elements (e.g. shell, solid, truss). For the validation of the proposed FE procedure the numerical simulations are presented. Additionally, the first part of the paper gives brief characterization of the engineering applications of the Bodner–Partom constitutive equations used for the different modelling of materials.

Plasticity over a wide range of strain rates and temperatures

Bodner S. R.

Archives of Mechanics

2005

Vol. 57, nr 2-3

73--80

A number of constitutive theories of elastic-viscoplastic deformation were proposed over the past years which have been found useful for practical applications. Most of them use the second invariant of deviatoric stress, as identified by Huber, as the effective stress driving inelastic deformations. This paper examines a particular constitutive theory, that of Bodner-Partom, over a very wide range of strain rates and temperatures.