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2 Machine Dynamics Research

2 2012

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Simulation of Energy Dissipation During Impacts with Hyperelastic Elements

Osiński J., Rumianek P.

Machine Dynamics Research

2012

Vol. 36, No. 2

64-75

The aim of this article is to analyze the possibility of energy dissipation during the impact a pedestrian by a vehicle. The energy created during the impact will be dissipated by element of protection made of a hyperdeformable material. Energy intensive structures are able to take over the kinematic energy during impact, which is equivalent to the work of their destruction (crushing, breaking). This has the effect of increasing pedestrian safety during the accident to fulfillment of the regulation of the European Parliament and Council Regulation (WE) No 78/2009 of 14 January 2009 with all amendments. Ensuring the safety and reduce pedestrian injuries during an accident is very important. Presented in work method of analysis of polyurethane materials, hyperdeformable with using the Finite Element Method can demonstrate how important it is to conduct researches to increase security. Exercising studies of materials using the FEM can verify used materials, and thus, drawing conclusions and present proposals for the use of new materials with improved properties. To describe the properties of the foam will be used previously known theories: hyperelstic materials and properties of elastic-plastic materials, including volumetric plastic deformations. The results of experimental studies will enable determine the model of to the foam and use it in calculations using the Finite Element Method of ABAQUS system. Explicit calculation of the dynamic module of the ABAQUS system is used to simulate impact of a bumper with protective element in the under-bumper beam to the pedestrian, will be analyzed the degree of energy dissipation. Simulation will allow an assessment of the effectiveness pedestrian protection - the operation of protection element.

Application of Modified Ogden’s Model for Describing Features of Composites with Gas Phase

Osiński J., Rumianek P.

Machine Dynamics Research

2012

Vol. 36, No. 2

76-83

In modem technology, more widely are used the composites with the gas phase - porous structures with pores closed, filled the gas. Can find here polymeric materials: EPP polyurethanes used in automobile bumpers, CELLASTO polyurethane in suspension systems. To the same group may also include gazars - composites reinforced by gas, and thus structure, in which the gas in the closed pores is subjected to initial pressure. Gazars are made as the structure of metal, usually copper, carbon dioxide or a mixture of gases. The aim of this work is to develop methods of describing the properties of such materials based on knowledge of: basic materials, technologies (gas pressure formed during foaming) using the theory of hyperplastic materials, in particular using Ogden’s model and its modifications. The resulting description can be used for the applicability of hyperelstic models, and therefore in the whole range of deformation of the polymer-based composites and elastic composites of metals (not included plasticity). Verification of the method is carried out through the execution of experimental EPP foam polyurethane derived from car bumpers, enabling a better understanding of materials and will be able to better modify structures, and thus, improve the mechanical properties.