scholarly journals Modelling Snow Slab Release Using a Temperature-Dependent Viscoelastic Finite Element Model with Weak Layers

2003 ◽  
Vol 24 (5/6) ◽  
pp. 417-430 ◽  
Author(s):  
Martin Stoffel ◽  
Perry Bartelt
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Temperature Dependent

scholarly journals Determination of Nugget Size in Resistance Projection Welding: Numerical Method with Experimental Measurements

2018 ◽  
Author(s):  
Danial Mohammad Rezaei ◽  
Behzad Heidarshenas ◽  
Fazel Baniasadi
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Temperature Dependent ◽  
Projection Welding ◽  
Nugget Diameter ◽  
Electrode Force ◽  
Weld Current ◽  
Weld Time

The aim of this paper is to at first evaluate the influence of three key parameters including weld current, weld time and electrode force on nugget diameter and tensile strength in resistance projection welding. Then, a 2-D axis-symmetric finite element model is developed to simulate the projection welding and predict the nugget diameter. Finally, the FEM results are compared to experimental data to verify the simulation model and simulated results. In the finite element model, the temperature-dependent material properties were taken into account.  

Analysis of the Machining Process Using a Thermo-Elastic-Viscoplastic Finite Element Model

Manufacturing ◽  
2002 ◽  
Author(s):  
N. Balihodzic ◽  
H. A. Kishawy ◽  
R. J. Rogers
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Machining Process ◽  
Tool Geometry ◽  
304L Stainless Steel ◽  
Stress Distributions ◽  
Temperature Dependent ◽  
Machined Surface ◽  
Orthogonal Machining

A plane-strain thermo-elasto-viscoplastic finite element model has been developed and used to simulate orthogonal machining. Simulations of cutting 304L stainless steel have been carried out using sharp, chamfered, and honed ceramic tools. Employing a combined thermal and mechanical stress analysis with temperature-dependent physical properties, the finite element model is used to investigate the effect of process parameters, tool geometry and edge preparation on the machining process. Stress and strain distributions within the chip and the elastic tool are presented. In addition, trends in the cutting and thrust forces, contact stress distributions and the plastic deformation beneath the machined surface are studied.

Nonlinear Heat Conduction in Materials with Temperature-Dependent Thermal Conductivity Using Hybrid Finite Element Model

2012 ◽  
Vol 472-475 ◽  
pp. 1514-1517
Author(s):  
Xin Juan Zhao ◽  
Ji Yi Zhao
Keyword(s):  
Finite Element ◽  
Heat Conduction ◽  
Finite Element Model ◽  
Integral Functional ◽  
Element Model ◽  
Element Formulation ◽  
Nonlinear Heat Conduction ◽  
Temperature Dependent ◽  
Hybrid Finite Element ◽  
Kirchhoff Transformation

The boundary-type hybrid finite element formulation is established to solve nonlinear heat conduction in solids with temperature-dependent material definition. The Kirchhoff transformation is first used to convert the nonlinear heat transfer system into a linear system, which is then solved by the presented hybrid finite element model, in which the fundamental solutions are used to approximate the element interior fields and conventional shape functions are used for the element boundary fields. The weak integral functional is developed to link these two fields and establish the stiffness equation. The accuracy and stability of the algorithm are tested on two examples involving various thermal conductivities to verify the present formulation.

Study on the Thermal Expansion Displacement during Spot Welding Depending on the Multi-Physical Coupling Finite Element Model

2014 ◽  
Vol 941-944 ◽  
pp. 2007-2011
Author(s):  
Cai Ping Liang ◽  
Yong Bing Li
Keyword(s):  
Finite Element ◽  
Thermal Expansion ◽  
Finite Element Model ◽  
Spot Welding ◽  
Welding Process ◽  
Physical And Mechanical Properties ◽  
Element Model ◽  
Temperature Dependent ◽  
Monitoring And Forecasting

An incremental and thermal electro-mechanical coupled finite element model has been presented in this study for predicting spot nugget size, gap between workpieces, and thermal expansion displacement during spot welding process. Approximate temperature dependent material properties, including physical and mechanical properties, have been considered. The spot nugget shape and the thermal expansion displacement were obtained by simulation. The solutions showed that the displacement of workpieces was directly related to the quality of solder joints and can be as a monitoring parameter of spot weld quality. These calculations provide a theoretical reference for nugget quality monitoring and forecasting by electrode expansion displacements.

scholarly journals Determination of Nugget Size in Resistance Projection Welding by Means of Numerical Method and Comparison with Experimental Measurement

2018 ◽  
Author(s):  
Danial Mohammad Rezaei ◽  
Behzad Heidarshenas ◽  
Fazel Baniasadi
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Temperature Dependent ◽  
Projection Welding ◽  
Nugget Diameter ◽  
Electrode Force ◽  
Weld Current ◽  
Weld Time

In this paper, firstly, experiments are carried out to evaluate the influence of three key parameters including weld current, weld time and electrode force in nugget diameter and tensile strength in projection welding. Then, a 2-D axis-symmetric finite element model is developed to simulate the projection welding and predict the nugget diameter. Finally, the FEM results are compared to experimental data to verify the simulation model and simulated results. In the finite element model, the temperature-dependent material properties are taken into account.

The Application of Multi-Node Cable Element

2012 ◽  
Vol 430-432 ◽  
pp. 1498-1501
Author(s):  
Xiao Yu Sun ◽  
Zhen Qing Wang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Longitudinal Mode ◽  
Element Model ◽  
Nonlinear Finite Element ◽  
Temperature Dependent ◽  
Simplified Approach ◽  
Linear Finite Element ◽  
Nonlinear Finite Element Model ◽  
Inertia Forces

A non-linear finite element model of inclined cables, cables with non-leveled supports, in the large displacement and deformation fields is proposed for computing the dynamic response to wind loads which blow in arbitrary direction. The temperature-dependent elastoplastic behaviors of cables were taken into account in the nonlinear finite element model. This model was used for an extensive looping factor parameter study.A parametric super element model for cable passing through multiple pulleys is presented in this study for the static analysis of structures. The proposed formulation,which accounts for longitudinal inertia forces, allows to spot the circumstances when the simplified approach, adopting longitudinal mode condensation, becomes too crude.

scholarly journals Concurrent Multiscale Modeling of Embedded Nanomechanics

2001 ◽  
Vol 677 ◽  
Author(s):  
Robert E. Rudd
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Multiscale Modeling ◽  
Element Model ◽  
Multiscale Simulation ◽  
Atomic Scale ◽  
Multiscale Simulations ◽  
Temperature Dependent ◽  
Micro Electro Mechanical Systems ◽  
Dependent Processes

ABSTRACTWe discuss concurrent multiscale simulations of dynamic and temperature-dependent processes found in nanomechanical systems coupled to larger scale surroundings. We focus on the behavior of sub-micron Micro-Electro-Mechanical Systems (MEMS), especially micro-resonators. The coupling of length scales methodology we have developed for MEMS employs an atomistic description of small but key regions of the system, consisting of millions of atoms, coupled concurrently to a finite element model of the periphery. The result is a model that accurately describes the behavior of the mechanical components of MEMS down to the atomic scale. This paper reviews some of the general issues involved in concurrent multiscale simulation, extends the methodology to metallic systems and describes how it has been used to identify atomistic effects in sub-micron resonators.

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