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The anti-backlash double-roller-enveloping hourglass worm gearing is multi-tooth meshing transmission and it has complex tooth profile. It is difficult to obtain the load distribution among the meshing tooth pairs and the stress distribution along contact line with analytical model. So, based on the geometrical model of the anti-backlash double-roller-enveloping hourglass worm gearing, the Finite...
Finite element analysis has been used to investigate the vibration modal of 480 crankshaft and the stress analysis of crankpin. The aim of the modal analysis was to explain the relationship between the frequency and the vibration modal. And the aim of the stress analysis of crankpin was to find the maximum deformation and maximum stress point. In this paper, three-dimension models of 480 diesel engine...
To establish three dimensional finite element model of the whole cervical spine and investigate biomechanical characteristic of the human cervical spine for application of clinical diagnosis and therapy. Method: A healthy adult female was subjected, three dimensional finite element model of the whole cervical spine was established using the method of 3D interpolation with CT. Result: The model included...
With the fast development of computer science since the 1990s, great progress has been made in the study of numerical calculating method which has been applied to such discipline as Rock Mechanics. There are many advantages in analyzing geo-stress field of oil or gas reservoir by the method of three-dimensional numerical calculation. With a typical example, this paper demonstrates how to apply three-dimensional...
The distribution of surface metal magnetic memory (MMM) signals on flat-plate specimens of ferromagnetic materials has been investigated for three types of Q235, 45 steel and T10. Defects were made on the latter two materials in order to obtain concerned signals using magnetic memory sensor at different state of plastic deformation. Stress was calculated using finite element method under plastic strain...
This article established the pelvis models with aeolotropic material property, and made modeling and mechanical analysis of the acetabular transverse fracture models treated with different internal fixation methods. The mechanical indexes we interested in are as follows, the maximal displacement, the maximum equivalent stress and the maximum stress around the fracture line. Through the compare of...
Based on the elastoplasticity contact finite element theory, the high contact-radio gear three dimensional static state finite element analysis model was established, The Newton-Raphson method is used to get the statics contact stress and load distribution factor of gear teeth, and the influence of different fricton coefficients. Comparison with Hertz contact stress, the correctness of this method...
Railway vehicle structures endured multiaxial fatigue loads in the service process, which aroused many difficulties for bogie frame's design and analysis. In this paper, firstly, the basic theory of multi-axial fatigue was explained. Secondly, the modeling methods of finite element analysis and stress state under standard loads were analyzed. Finally, three methods (maximum principal stress, Mises...
The current paper investigates a destructive accident of Zhengxiang transmission line, in which there was six-tower collapse that might be demonstrably conducted by the downburst gust. Based on the dynamic stress analysis of tower members under the strong wind, tower collapse procedure is simulated by finite element method. Finite element method together with material nonlinearity, large deformation,...
Recently, sliding contact mechanisms are being used to supply current to rotating or moving objects in a number of industrial applications. In this paper, we examine the heating and deformation that affects the contact areas of these sliding contact mechanisms by means of experiment and numerical analysis. In both the experiments and the finite element method (FEM) analysis, deformation was observed...
ANSYS/LS-DYNA finite element software is applied to analysis shocking simulation for washing machine and its packaging with different postures (surface, edge) and different dropping heights. The yielding critical dropping height of suspender is obtained. The response acceleration curves, effective stress and plastic strain cloud fringe distribution on washing tub and shell are also available. The...
Temperature warping stress and vehicle load will lead the fatigue failure of the concrete pavement. Simulation of the finite element model with different parameters was obtained, and analyzed the effect of the concrete pavement with different parameters. The temperature stress in the concrete pavement slab is increasing notably by the increasing of the length and thickness of the slab and foundation...
The exact prediction of creep is of great significance to the simulation of the stress field of concrete creep. As the limitation of the current prediction model of creep, by considering the characteristic of the concrete material, the available test data and the pertinent models abroad, the creep coefficient formulae is obtained. In the creep prediction of the high performance concrete, all the influencing...
In order to slow down the formidable shearing stress which is caused by the heavy traffic conditions of the heavy load, the heavy tire pressure, the high velocity and so on under the wheel load, especially to solve the wheel rut problems of bituminous concrete pavement under the channel traffic, this article will analyze and research the maximum shearing stress in the semi-rigid basic unit and heavy...
Finite element analyses were carried out to probe into the stress characteristics of crossbeam web cutout for steel orthotropic deck. Considering the load distribution of wearing surface, stress characteristics were researched for the central crossbeam web cutout in the case of fixed wheel loads with totally symmetrical distribution. The results show that the maximum principal stress distributes primarily...
Through-Silicon Vias (TSVs) have recently aroused much interest because it is a key enabling technology for three-dimensional (3-D) integrated circuit stacking and silicon interposer technology. In this study, a 3-D 1/8th symmetrical nonlinear finite element model of a stack die TSV package was developed using ANSYS finite element simulation code. The model was used to optimize the package for robust...
NC machining distortion theory is studied by analyzing the typical aircraft wing rib aluminum alloy structural part. The reasons which lead to machining distortion are accounted for. The research method and process of theoretical model, finite element analysis and milling experiment are presented. The effect of residual stresses on machining distortion which distribute in the aircraft structure part...
Aiming at the design defect of pre-existing Electro-magnetic circuit parameters on Electro-magnetic treatment equipment, the article gives some design methods-field-circuit methods which design and adjust the electromagnetic processing parameters. Mean while, the interdependent relationship of the Electro-magnetic parameters, temperature field parameters and stress parameters is displayed in the models...
Stress in flip-chip (FC) packaging process will have a great effect on the performances and reliability of the packaged devices, especially the mechanical parts. Flip chips with various bump-area-arrays have diverse stress distributions due to temperature loads. Since the top surface of the chip is not exposed to optical observation, the traditional full-field optical measurement techniques are not...
Warpage, high stress in dies and solder joints are introduced in assembly process of a package-on-package component. In this paper, a finite element approach is proposed to predict the warpages and stresses during the full assembly process. By the techniques of element die and birth as well as restart method, the approach is able to transfer the stress and warpage in one process to the next so that...
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