Tadeusz Niezgoda

Numerical Analysis of Vehicle Suspension System Response Subjected to Blast Wave

This paper presents the development process of a numerical model for a terrain vehicle suspension system. Geometry of the tire and other suspension elements were achieved using reverse engineering technology. In the next step, numerical analyses of the suspension system subjected to blast wave were carried out with two different techniques, e.g. SPH (Smoothed Particle Hydrodynamics) method and the blast wave Conwep model.

Dynamic behaviour of Various Fibre Systems During Impact Interaction - Numerical Approach

The paper presented shows a part of investigations covering the contact problem in numerical modelling using an explicit code. The authors have outlined the parameters and factors that have a direct impact on a proper contact definition, which, as is known, has much importance in finite element analyses. For the purpose of the study, a test model was proposed, where an interaction between a net and chosen 3D object with relatively small geometric dimensions and low weight was simulated. Additionally several net structures were analysed in which their contact characteristic was modified. Different interaction con ditions in each case resulted in a different influence on the 3D object’s behaviour, especially its velocity and trajectory changes.

Research of Elastomeric Protective Layers Subjected to Blast Wave

The paper is based on non–linear finite element analysis of the blast wave effects on structures, caused by the detonation of explosive materials. Dynamic response of a structure with and without elastomeric layers subjected to the shock wave produced by the detonation of high explosive materials is presented in this paper. Coupled Euler and Lagrange formulation are used in the finite element analysis of such problems to accurately represent the detonation phenomenon. Research related to blast wave propagation is not only aimed at its effect on structures but also on developing new concepts of protective panels. The research carried out on various structures (such as multi–layer panels) has been performed to find out the most efficient protection against a detonation wave. Tests of multi-layer protective panels ability to absorb the explosion energy were also conducted under field conditions and confirmed in numerical studies. The application of structural protective layers made of elastomeric material significantly reduced the blast wave thanks to dissipation capabilities. Additionally, the shape effect of structural steel elements (streamlined profile) during the interaction process with a shock wave has been also confirmed.

Numerical Modelling and Simulation of an Internal Combustion Engine Piston with a Surface Coating

In recent years, one can observe an ever growing interest in application of special kinds of surface coatings called Graded Materials — GM and Functionally Graded Materials — FGM. They are used in various kinds of industry and have a wide range of applications, one of which are thermal barriers. The aim of applying such coatings, e.g. on elements of an internal combustion engine, may be multiple: on the one hand — upgrading the efficiency of combustion, better performance of the engine, less pollution, and on the other — obtaining higher strength and durability, as well as better tribological properties of its parts.

Numerical Assessment of Pipe Effort in Large Deformed Areas

The results of numerical simulations of some selected states of loading the pipelines within the non-linear range, with account taken of large displacements and deformations, are described in this paper. Numerical analyses resulted in sizes of deformations, strains and stresses, which further on were used to conduct comparative analysis with results effected by tests carried out on a testing stand under laboratory conditions. At points where the pipeline is supported with pipe bearers, various kinds of dents, folds, ovalisations of the pipeline’s cross-section may occur so that results of numerical simulations enable evaluation of deformation sizes in a real pipeline structure.Copyright

Computer Simulation of Pipeline Deformations on the Basis of Data From an Intelligent Caliper Inspection Tool

The method of pipeline inspection data usage for needs of numerical analysis of technical condition of pipeline is considered. A real crude oil pipeline was taken into considerations to make numerical assessment of stress state in case of large deformations which were measured by an intelligent caliper inspection tool. The pipeline was rested on concrete supporting blocks in a boggy terrain. The tool detected very large deformations of the pipe in the areas of these supports which were caused by washouts. Data from the tool were processed into the format readable for MSC/PATRAN-graphical pre-processor of the computational system MSC/NASTRAN based on the Finite Element Method – FEM. Then a mesh of discrete model was generated by means of MSC/PATRAN.© 2003 ASME