Papers by Keyword: Equivalent Stress

Abstract: As it stands now, rubber has been the main material used in the making of pneumatic vehicle tyres. Speed of the vehicle depends on many factors like steering geometry, inflation pressure, vehicle load, road temperature and environmental conditions. The main aim of this research is to develop a finite element approach and computationally evaluate the performance of a steady-state rolling tyre by changing the tyre tread patterns. The tyre normally composed of rubber and body-ply was investigated with regards to the effect of the inflation pressure. Tyre modeling using six different types of patterns was completed by using Creo parametric 3D modeling software and then the tyre was discretized into small elements through ANSYS R16.2. The rim area of the tyre was fixed and pressure was applied to the inside surface of the rim. Finite element analysis was completed by using ANSYS R16.2 and equivalent stress, contact stress and contact pressure were found out to identify the best tyre pattern. From the final results it was observed that, Pattern-I had good agreement of results as compared to other type of patterns which showed medium frictional stress and contact pressure.

Abstract: Wire EDM is one of the most non conventional machining processes used for cutting of different types of complex materials. Copper material in wire EDM has a wide application in several industries but its thermal and structural analysis in wire EDM has challenged the authors to model the work-piece and tools accurately using the software. The present work deals with the design of a 3 dimensional model of a work-piece material made of copper. The objective of the present work is to analyse the temperature, total heat flux and equivalent stress of the work-piece material using finite element analysis in ANSYS software. In the current work, a 3D model was designed with the Steady state thermal analysis and it was designed with the available experimental data using ANSYS workbench. The temperature and the total heat flux were calculated using this analysis. Another analysis is performed using Static structural to calculate the equivalent stress generated in the work-piece material using ANSYS. The model was developed for single spark only. Automated type of meshing and axi-symmetric type of geometry are considered for this experiment. The wire part is neglected and all the analysis is made on the work-piece only. XRD analysis is also performed on the work-piece material to know the crystallinity of the compound. Mesh Convergence test was also performed to determine the optimum solution for the requisite mesh. Finally the model was designed and various graphs were plotted for the temperature, total heat flux and equivalent stress of the material.

Abstract: The paper considers the issue of shrinkage stresses of elastic-plastic deformation in the casting ‘Slag bowl’ resulting in a discontinuity and hot crack formation. The stress-strain state of the wall of the as-cast billet during the process of power interaction between the casting and the mould has been analysed according to the existing algorithms. Quantitative indicators of the components of the total stress state in the wall of the casting at the time of hot crack formation were determined. It was found that the bending stress greatly affects the defect, comprising 96 % of the tensile strength of the casting material at the time of destruction. The techniques aimed at reducing hot crack formation in a body of as-cast billet based on the results from the calculations are recommended. In accordance with the proposed recommendations, the changes in the technological parameters in production of a batch of pilot castings showed a decrease in the defect on hot cracks by 73 %.

Abstract: High pressure gas cylinder thread joint is the weak link in high pressure gas cylinders, The cylinders in use and the operating process, the main causes of cylinder screw thread failure is the improper preload. In this paper, cylindrical high-pressure cylinders threaded,connection for example,according to the bottleneck and the bottlevalve for high pressure gas cylinder structure, material and mechanical characteristics, establishing 3D solid model of the high-pressure cylinders connected by using the finite element software ANSYS, 3D model is applied to high pressure cylinders, thread connection analysis.

Abstract: The Finite Element Method (FEM) is used to analysis multiply asperity sliding contact surface. The various distributions of stress and strain along the asperity contact profile are shown for various pressure, roughness, sliding velocity, friction coefficient, and thermal conductivity. The results show that equivalent strain increases as the friction coefficient decreases. Similar results are found for the shear stress. However, the maxima equivalent stress at the center peak increases as the roughness, thermal conductivity, or loading force increases. Instead of the peak point, maxima equivalent stress and strain can be found at the contact/non-contact interchange point of the contact profile. The equivalent stress and strain increase as the loading force increases. In addition, the normal stress increases as the friction coefficient and loading force increase. The maxima normal stress can be found at the center peak point.

Abstract: Punch is a key component in Socket-Spanner extrusion and its shape influence the extrusion molding heavily. Using the FEA software DEFORM, the paper simulated the extrusion process of three kinds of upper and lower extrusion punch combinations which have different shape and studied the influences of the punch shape on metal flowing, Z direction punch load and equivalent stress. By contrasting the simulation data, the best punch shape was chosen. Our results could provide theory evidence for optimization design of Socket-Spanner extrusion punch. It was shown that the tapered bottom punch is the most suitable shape for the socket-spanner extrusion than the flat tapered and the flat one.

Abstract: Using ANSYS finite element simulation L plate that existing in the structural engineering,stress analysis was carried out on the plate, comparing the result with other two rectangular plate model which outer contour of the same size, and draw relevant conclusions.

Abstract: By using finite element software ANSYS, stress analysis was conducted to the annular sector semicircular cross section vessel which was made up of an annular sector plate, two semicircular plates and a semi-cylindrical with thicknesses of 20mm. The analysis results show that the maximum equivalent stress of the annular sector plate appears in the middle of the plate, and the maximum equivalent stress of the semicircular plate and the semi-cylindrical appear in the inner surface of the connections. The equivalent stress distribution trend of the annular sector plate, semicircular plates and the semi-cylindrical was obtained. Through these researches, the distribution trend of equivalent stress provided a reference for the design of the annular sector semicircular cross section vessel.

Abstract: For the volume expansive of cement-based materials subjected to sulfate attack, based on microporous mechanics, the model of representative volume element (RVE) is established to analyze the distribution of microcosmic expansive stress in RVE. By homogenization method, the macroscopic equivalent stress of RVE is analyzed. The results show: on the microcosmic scale, the stress of internal sphere in RVE in all directions is compressive, and the radial stress of spherical shell is compressive, but the hoop stress is tensile; on macroscopic scale, the radial equivalent stress is compressive, the hoop equivalent stress is tensile.

Abstract: The response of the equivalent stress (Seqv) in adhesively bonded steel butt joint and the adhesive bondline during Izod impact test is studied using the finite element method (FEM) software ANSYS. The results obtained show that the highest value of the stress Seqv almost higher than the yield strength of the adherend reached within about 0.1 ms. The contour diagram of the stress Seqv is symmetrical to the axis along the half height of the specimen both in whole adhesively bonded steel butt joint and the adhesive layer. The peak value of the Seqv in adhesive increases first and then decreased when the action of the impact was over. The stress Seqv in both ends of the specimen kept to a relative lower value during impact procedure.