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Designing an impact energy-absorbing device : numerical simulations

100%

Ryzińska G. , Skrzat A.

2015

tom z. 87 [291], nr 4

349--357

The numerical results of 1100-aluminium extrusion tests conducted at a tool velocity of 36 km/h are presented. Engineering applications of the considered problem concern the use of this extrusion technology in the design of an impact energy absorbing device. Viscous and plastic properties of the extruded materials are described on the basis of numerical simulations of a tensile test in which the Bodner-Partom material model is applied. The numerical results are compared with experimental ones.

W pracy zaprezentowano wyniki obliczeń numerycznych wyciskania przeciwbieżnego aluminium w gatunku 1100 z prędkością 36 km/h. Elementy technologii wyciskania zastosowano do projektowania urządzeń pochłaniających energię uderzenia. Właściwości lepko-plastyczne materiału zostały opisane w oparciu o symulację numeryczną testu jednoosiowego rozciągania z zastosowaniem modelu Bodnera-Partoma. Wyniki symulacji numerycznej porównano z wynikami eksperymentalnymi.

Elasto-Viscoplastic Properties of AA2017 Aluminium Alloy

94%

Ambroziak A. , Kłosowski P. , Pyrzowski L.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2011

tom Vol. 15, No 1

5-20

This paper describes a procedure for the identification of material parameters for the elasto-viscoplastic Bodner-Partom model. A set of viscoplastic parameters is identified for AA2017 aluminium alloy. The evaluation of material parameters for the Bodner-Partom constitutive equations is carried out using tensile tests. Numerical simulations of material behaviour during constant strain-rate tests are compared with direct uniaxial tensile experiments. A review of the models applied to concisely describe aluminium alloy is also given.

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

83%

Ambroziak A.

Computer Assisted Mechanics and Engineering Sciences

2007

tom 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.

Determining the viscoplastic parameters of rubber-toughened plastics

83%

Ambroziak T. , Kłosowski P.

tom Vol. 12, No 1-2

35-43

This paper describes the material parameter determination procedure for the elasto-viscoplastic Bodner-Partom model. A set of viscoplastic parameters is determined for rubber-toughened propylene-ethylene copolymer, and is used to numerical simulations of the material behavior under different strain rate deformations. The evaluation of material parameters for Bodner-Partom constitutive equations is carried out using tensile tests.

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

48%

Zalewski R. , Skalski P.

tom 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.