Showing papers in "Archives of Civil and Mechanical Engineering in 2008"

TL;DR: In this article, the basic concepts of advanced high strength steels (AHSS) for use in the automobile industry, including chemical composition design, microstructure and mechanical properties development during thermomechanical processing, production technology characterisation, potential applications and performance in service, are presented.

TL;DR: In this paper, the influence of hot-working conditions on recrystallization behavior was investigated and the σ-e curves and identification of thermally activated processes controlling work-hardening by the use of the Gleeble simulator were determined.

TL;DR: In this article, the authors present an overview of the state of the art in mechanical joining technologies and their application potential with practical examples of different process alternatives, including dieless clinching.

TL;DR: In this article, a wide introduction into the problems of modelling of the restricted water effects on ship motion using CFD is presented. But this presentation is illustrated with the examples of calculations performed using the commercial system Fluent.

TL;DR: In this article, the authors present extensive possibilities of component development in automotive industry by means of hydroforming processes and also presented some examples on computer modelling of these processes and limiting phenomena.

TL;DR: In this paper, the structure and change in hardness of the welded Hardox 400 and Hardox 500 steels have been presented and a method of thermal joints treatment has been proposed, consisting in their hardening and low-temperature tempering at the heat-affected zones.

TL;DR: In this paper, two methods of clinching, round press joining and square press joining, were considered for deformable zone components and the results showed that they could be applied in controlled body crushing zones.

TL;DR: In this paper, the results of applying neural networks in predicting effectiveness ratios, i.e., W(N), Sj and Kj for earthmoving machinery systems consisting of c excavators and N means of transport, were presented.

TL;DR: In this article, the effect of both the punch geometry and material mechanical parameters (especially strain hardening and plastic anisotropy) on the limit expansion of the hole was determined.

TL;DR: In this article, a review of selected material separation criteria available in commercial MSC software applied for the SPR process simulation is presented, where the authors define precisely the moment of upper layer separation leading to rivet penetration of lower layer(s).

TL;DR: In this paper, two research foci on magnesium are pursued, one focusing on the production of semi-finished products for magnesium sheets and strip production by twin-roll-casting, the other focus is on the fabrication of long products as wire, intended for fabrication of joining elements.

TL;DR: In this paper, a comparison between conventional cold wire drawing and wire drawing combined with the application of high-density electric current pulses is presented, which shows a decrease in the pull force for wire drawing.

TL;DR: In this paper, the tensile behavior of a commercially pure titanium is studied using a full-field strain measurement, and an elastic-plastic model taking material anisotropy into account is proposed.

TL;DR: In this paper, a flying wheel was used for dynamic testing of sheet metal samples, and the results showed that Young's modulus lower holder should be equal to modulus of sample material, the significant decrease in disturbance of tensile force course was obtained.

TL;DR: In this article, the free surface flow using volume of fluid (VOF) method with interface capturing approach with three high-resolution schemes is modeled and the model is discretized using three highresolution schemes.

TL;DR: In this article, the results of the studies on fabrication of die forgings of rocker from billets cast in the horizontal continuous process and compared with the results obtained on extruded rods from the EN AW-6082 alloy were quoted.

TL;DR: An equivalent single layer model for linear static analysis of multilayered plates is considered in this paper, where the displacements field of the First Order Shear Deformation Theory is supplemented with the Murakami's function to emulate the zig-zag effect.

TL;DR: In this article, the structural modification caused by sandwich design provides an increased specific flexural rigidity, and the evaluation of suitable calculation methods represents a crucial step to a broad application of semi-finished metal plastic sandwiches within bulk production processes.

TL;DR: In this paper, the authors present examples of fatigue stress fractures of quarry equipment drive shafts, and they have performed a detailed analysis of the problem and presented the experimental data, numerical analysis and metallographic examination.

TL;DR: In this article, the authors propose a method to increase the amount of cold-rolled sections in vehicle construction. But the success of these components will for one thing be depending on technical feasibilities and for another thing on the profitability of the manufacturing processes.

TL;DR: In this article, the authors focused on determining the practical range of tools geometrical and kinematical parameters guaranteeing the proper course of the rolling-extrusion process of hollowed parts.

TL;DR: In this article, internal cracks in concrete and steel bars are investigated for deformation characteristics of cracked concrete structures and the effect of internal cracks on the bond of the concrete and the steel.

TL;DR: In this paper, the problem of realization of thermomechanical treatment for microalloyed-steel forgings is discussed on the example of high pressure-pump crankshaft.

TL;DR: In this paper, the Advanced Forming Process Model (AFPM) is proposed to model and simulate the metal forming process and their application in product design, production, and forming process planning.

TL;DR: In this article, a complex hybrid system, dedicated to modelling of life cycle of materials and optimization of their in use properties, is presented in the paper. But the particular emphasis is put on control of selected in-use properties of products by proper design of technological parameters for consecutive stages of the production chain.

TL;DR: Physical modeling of the changes occurring in the structure of low-alloy C-Mn-Al TRIP-aided steel during hot-rolling was presented in this article.

TL;DR: In this article, the thermovision method was applied for determination of the temperature of a grinding wheel during abrasive cutting of steel workpieces by using grinding wheels purchased from three different manufacturers under different conditions.

TL;DR: In this paper, the authors present the possibilities of forming by means of cross rolling method (CR) of the parts with cross section different from circular one, and the methodology of profiled tools forming is provided.

TL;DR: In this article, the hot-forging process of dual-phase titanium alloy was analyzed and two variants of impression-die forging with variable temperature of billet were compared with a commercial program QForm2D/3D.