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Vacuum glazing is a new energy-saving material; the damage of it is caused mainly by the tensile stress. In this paper, stress distribution and parameters of vacuum glazing effect on stress and deformation have been researched according the Atmospheric effects using finite element method. The paper suggests that support pillar spacing and change of glazing thickness have larger influence on stress...
The mechanical fit between the connecting rod's small head and the bush is a typical interference fit. The thick cylinder model is applied to calculate the theoretical stress on the surface of the small head for this fit. By the contact finite element method, the simulation model is used to get the stress and deformation by constructing the true interference of fit bodies. The stress on the connecting...
The principle of material damage and the Cockroft-Latham damage model were demonstrated. The finite element simulation combined with fracture criterion has been performed in order to predict fracture. An optimisation method for the helical gears precision forging was proposed based on the finite element method(FEM) and Taguchi method with damage minimization. The maximum damage value of all element...
This paper presents an example of optimization of piezoresistive element placement on substrates for different types of deformation transducers (single side fixed cantilever beam and membrane). Modelling of structures was performed by simulator utilizing finite element method (FEM). Modelling and simulation of stress and strain distribution and deformations is practically essential for any design...
Based on the elastic and plastic theory, Three-dimension milling Finite Element Method model is established in this thesis, which can be used in the machining deformation field analysis. This model simulates the process of material cutting off, which uses the technology of element die and birth. The machining deformation law is researched resulted by the release of residual stress in milling process...
When the flip-chip packaging has been moving to the lead-free, fine-pitch and high-current-density packaging, the flip chip with copper-pillar-bump interconnects can provide a solution to this need. However, this package during the thermal cycling test (TCT) still suffers the reliability problems such as delamination at the Cu low-k materials or at the interface between the UBM (under bump metallurgy)...
The changeover from eutectic Sn-Pb solders to lead-free solders has been driven by environmental concerns and market accessibility in the last few years. Though a number of creep constitutive laws of lead-free solder have been reported due to the importance of creep in solder joint failure in the electronic packaging, these constitutive laws often show great variations across the applicable stress...
High in situ stress and some geological disasters induced, such as large deformation, are well known as the complex engineering problem which often happen in tunnel construction. Large deformation can bring great threat to tunnel safety during construction and operation, but so far there is no concrete and applicable methods for the prediction of large deformation, it needs to to further developed...
Machining simulation and deformation prediction are effective approaches to improve machining error in processing thin-walled parts. However, the empirical studies are still insufficient to improve this problem. This paper uses the finite element method, through cutting process modeling, material removal modeling and calculating the initial residual stresses in machining process to predict and analyze...
The closure of Multi-span continuous rigid frame bridge is one of important steps in its construction. The selection of closure scheme determines the deformation and stress state of the bridge when construction is completed. In this paper, based on the situation of Jing River Bridge, which is now under construction in Gansu Province, finite element method is applied to analyze and compare the inner...
The crash characteristics of an extruded aluminum tube was evaluated by conducting compressive tests at the different rate of deformation and the results were numerically simulated. The numerical results obtained using finite element method were compared with compressive test results and theoretical studies. The test data was analyzed for mode of deformation, peak force and energy absorption characteristics...
The static and dynamic performances for the whole casting column of a high-speed horizontal machining center are analyzed by ABAQUS FEA software. The stress, deformation distribution, natural frequency and the mode of vibration under different conditions are simulated. Then the structure of the column is optimized and analyzed. The results show that: (1) The maximum stress is 1.19MPa and the maximum...
The rotor mechanical stresses and deformation of various interior permanent magnet (IPM) motors have been investigated by finite element method (FEM). The bridge and segment area of IPM rotors have been taken great attention, as the severe stresses and deformation are generated at high speed. Both the centrifugal forces and electromagnetic forces have been considered in the analysis. The electromagnetic...
There are many kinds of deformable objects in our living life. Some of them such as human tissues, human organs, and food exhibit rheological behaviors when they are subject to external force. In surgery simulation and food engineering, we need to simulate or control such behaviors. In this paper, four-element model associated with finite element (FE) method was employed to model rheological deformation...
Aiming at the problem of deformation of heavy hydrostatic thrust bearing, finite element method (FEM) is used to conduct its numerical simulation, and the law of the influence of temperature and load on bearing deformation is revealed. Experiment of oil film thickness in different velocity is also made. The results demonstrate that: the free thermal deformation of workbench and base is significant...
Reliability of microfluidic designs is an extremely important issue that defines the range of applicability of micro-devices. The reliability design of micro-channels presents new complications that require extensions of today's method to incorporate reliable prediction methodologies. In this paper, using the improved direct simulation Monte Carlo, a prediction method was proposed for the reliability...
Many of numerical analyzes of bulge forming processes have concentrated exclusively on the behavior of the deforming tube, with little analysis of the die behavior during the process. Finite element models have been developed to simulate axisymmetric tube bulging, with particular emphasis on the state of stress and deformation of the die. The effects of using internal pressure alone and combined internal...
The aim of this study is to measure and simulate warpage of flip-chip PBGA packages under thermal loading (from room temperature to 260degC). In the experiments, a full-field shadow moire is used for measuring real-time out-of-plane deformations (warpages) on the substrate surfaces of the flip-chip packages under heating and cooling conditions. The elastic moduli (Es) and coefficients of thermal expansion...
Due to the smaller size of HDD, fault deformation of solder bumps is found more often. In order to study about a factor relating to fault deformation of solder bumps, the FEM is used to investigate stress performance. The results show that a small number of bumps positioned in a symmetric form have similar stress while a small number of bumps positioned in the asymmetric form have different stress...
This study deals with the stochastic free vibration response of a laminated composite plate resting on a elastic foundation subjected to a temperature loading with uncertain material properties. The material properties are modeled as independent basic random variables. The temperature field considered is assumed to be a uniform distribution over the plate surface and through the plate thickness. The...
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