Optimization of the Induction Heating Process in Order to Achieve Uniform Surface Temperature

AbstractThe physics of the induction heating is based on coupling of the electromagnetism and heat transfer. The main heat source during induction heating is resistive heating caused by eddy currents in the heated specimen. The geometrical position of the inductors influences the final surface temperature distribution. There are many technological processes which require uniform surface temperature like process of induction hardening. The scope of the article is to show the numerical approach to optimize geometrical dimensions of the induction heating process in order to reach uniform surface temperature on heated specimen

Modeling of multiaxial state of stress and determine the fatigue lifetime for aluminum alloy during cyclic loading under in-and-out of phase shift φ = 0° and φ = 90°

This article deals with determining of fatigue lifetime of structural materials during by multiaxial cyclic loading. Thetheoretical part deals with the fatigue and with the criterions for evaluation of multiaxial fatigue lifetime. The experimental part deals with modeling of combined bending - torsion loading and determining the number of cycles to fracture in region low-cycle and high-cycle fatigueand also during of loading with the sinusoidal wave form under in phase φ = 0° and out phase φ = 90°.This article deals with determining of fatigue lifetime of structural materials during by multiaxial cyclic loading. The theoretical part deals with the fatigue and with the criterions for evaluation of multiaxial fatigue lifetime. The experimental part deals with modeling of combined bending - torsion loading and determining the number of cycles to fracture in region low-cycle and high-cycle fatigue and also during of loading with the sinusoidal wave form under in phase φ = 0° and out phase φ = 90°

The simulation and the experimental verification of the influence of the tig – welding of the aluminium alloy ALMGSI07 on changes of the mechanical properties in comparison with the basic material

The aim of this investigation is to evaluate the influence on fatigue behavior of the welded aluminum alloy AlMgSi07. For the experimental measurement of fatigue of these welds, it is needed to analyse all the changes, which will occur in the weld material in comparison with the basic material. The modern computer simulation and the experimental verification are strong tools for achievement of the required results, for instance a change of the structure, residual stress, a range of the heat affected zone, a deformation of the workpiece etcThe aim of this investigation is to evaluate the influence on fatigue behavior of the welded aluminum alloy AlMgSi07. For the experimental measurement of fatigue of these welds, it is needed to analyse all the changes, which will occur in the weld material in comparison with the basic material. The modern computer simulation and the experimental verification are strong tools for achievement of the required results, for instance a change of the structure, residual stress, a range of the heat affected zone, a deformation of the workpiece et

Experimental and numerical analysis of aluminium alloy fatigue lifetime under combined cycling bending - torsion loading

The article deals with determining of fatigue lifetime of structural materials during by multiaxial cyclic loading. The theoretical part focuses on fatigue and criterions for evaluation of the multiaxial fatigue lifetime. The experimental part deals with modeling of combined bending -torsion loading and determining the number of cycles to fracture in region low-cycle fatigue and also during of the loading with the sinusoidal wave form under in phase φ = 0°. Based on the experimental results the fatigue design curves are compared to fatigue data from base metal and weldments

Fatigue Performance of 6063-T66 Aluminum Alloy under Combined Cyclic Loading of Parent and Welded Specimens

The article deals with the determining of fatigue lifetime of structural materials during multiaxial cyclic loading. The aim of this investigation is to evaluate the influence on fatigue behavior of the welded aluminum alloy EN AW 6063-T66. Experimental device was designed for combined bending - torque loading. The experimental part was focused on the modeling of combined biaxial loading and determining the number of cycles to fracture in the region of low-cycle fatigue. In-phase loading can be treated fairly well using the conventional hypotheses (von Mises or Tresca) on basis of nominal, structural or local strains or stresses. Based on the experimental results the fatigue design curves are compared to fatigue data from base metal and weldments

Modeling and Experimental Analysis of the Aluminium Alloy Fatigue Damage in the case of Bending – Torsion Loading

AbstractThe article deals with determining of fatigue lifetime of structural materials during by multiaxial cyclic loading. The theoretical part focuses on fatigue and criterions for evaluation of the multiaxial fatigue lifetime. The experimental part deals with modeling of combined bending -torsion loading and determining the number of cycles to fracture in region low-cycle fatigue and also during of the loading with the sinusoidal wave form under in phase φ = 0°. Based on the experimental results the fatigue design curves are compared to fatigue data from base metal and weldments

Some Computational Aspects of Vehicle Shell Frames Optimization Subjected to Fatigue Life

The paper deals with the implementation of the fatigue damage conditions into structural optimization process. The study considers a shell finite element structural analysis in conjunction with the multiaxial rainflow counting, the fatigue damage prediction and naturally the sizing (element thickness) optimizing design. We will analyze FE models under random excitation in time domain. The presented optimizing approach will be implemented into solution program compiled in Matlab

IDENTIFICATION OF TECHNICAL STATE AND OPTIMISATION OF OPERATION OF TRANSPORT-HANDLING EQUIPMENT

This paper describes a real example from the practice concerning an analysis of technical state and operational optimisation of the given transport-handling equipment, which is installed in a trans-shipment station specified for transport and handling of bulk materials. By means of identification of a faulty technical state of this transport equipment there was determined the main cause of a damage process, which occurred during current operation. Consequently, it was possible to perform an optimisation of the relevant technical parameters in order to eliminate the negative phenomena

Determination the Contact Stress Depending on the Load Rate of the NU220 Roller Bearing

The purpose of this paper is to present the impact magnitude of the load rate of the roller bearing at mutual slewing of roller bearing rings to the process of contact stresses in rolling element. The roller bearing satisfies prescribed basic static load capacity if it is loaded by the maximum specified load only in the radial direction according to the ISO / TS 16281. The basic static radial load capacity of the cylindrical roller bearing determines the maximum loading for which there is no plastic deformation in the raceways yet. However, the real roller bearings are not loaded only in the radial direction in practice. During operation there exists a mutual slewing of the roller bearing rings. This leads to a change in the conditions of contact and contact stresses. The analysis of the mutual influence of these two parameters was made using finite-element software ADINA

The influence of joining technique on the deformation of laser welded T-joints

T-joints are often used in large-scale welded constructions. The use of a laser beam for welding allows to create joints using various techniques. Used welding method affects the shape and size of heat affected zone, deformation of welded elements and consequently the quality of the joint. This work concerns the numerical modeling of the size of heat affected zone and welding deformations in T-joint obtained with two different welding techniques: single-side fillet T-joint and butt welded T-joint, called I-core welded joint. Numerical simulations are carried out in the commercial Abaqus FEA software, supplemented by an additional numerical subroutines which enabled the analysis of thermomechanical phenomena occurring in welding process. Mathematical model of a moveable welding source and the description of heat source positioning relative to the edges of the connected elements are described in numerical subroutines. The material parameters of austenitic steel are taken into account. The size of deformations of welded joints are determined as well as the influence of two different joininig techniques of T-joint on the amount of generated welding deformations are analyzed and compared