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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.

Identification and validation of damage parameters for elasto-viscoplastic Chaboche model

Ambroziak A.

Engineering Transactions

2007

Vol. 55, iss. 1

3-28

The aim of the paper is to propose an improved procedure of damage material parameters identification of the Chaboche model, coupled with the concept of isotropic damage model proposed by AMAR a nd DUFAILLY. The proposed approach has been implemented into subroutines of the FE MSC.Marc code, as the user's viscoplastic subroutine UVSCPL, and has been used to perform FE static and dynamic computations. The paper gives a brief description of the Chaboche model including damage. The results are also presented of FE dynamic analyses using the respective UVSCPL subroutine. Analyses have been made for the nickelbased superalloy INC0718 and for steel. The numerical examples prove that the proposed identification approach is effective and the numerical implementation is correct.

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.

Numerical modelling of elasto-viscoplastic Bodner-Partom constitutive equations

Ambroziak A.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2005

Vol. 9, No 4

461-473

The aim of the paper is to propose an FE procedure for static and dynamic nonlinear analysis including elasto-viscoplastic constitutive equations of the Bodner-Partom model. Basic equations of the constitutive model are given with the flow graph used in the FE procedure. The proposed procedure has been applied in the MSC.Marc commercial system with a user-defined UVSCPL subroutine that enables application to a wide range of varied finite elements. A number of simple problems of static and dynamic analysis are presented to show the accuracy of this approach. The numerical simulations are compared with experiments to validate the proposed FE procedure.