Development of a New Finite-Element Method to Analyze Deformation of Plate Due to Line Heating

2001 ◽  
Vol 17 (01) ◽  
pp. 1-7
Author(s):  
Seung Il Seo ◽  
Yoon Ho Yang ◽  
Chang Doo Jang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Local Heating ◽  
Heating Element ◽  
Heating Process ◽  
Labor Costs ◽  
Line Heating ◽  
Element Analysis ◽  
Energy Principle ◽  
Heating And Cooling

The line heating process has been used to create curved surfaces of ship structures. However, because it depends on a worker's skill and experience, it has been a factor in preventing the automation of shipyards and in consuming labor costs. In this paper, to reduce the trial-and-error procedure of line heating work by simulating the deforming process of a plate, a finite-element analysis method is proposed. A new element, called the line heating element, is defined and applied. The line heating element is assumed to have orthotropic material property. Shrinkage forces and moments resulting from line heating are obtained by integration of inherent strains formed by local heating and cooling. The shrinkage forces and moments at the inherent strain region are converted to equivalent nodal forces by the energy principle. Results calculated using the line heating element show good agreement with the results obtained by the commercial finite-element analysis code.

scholarly journals Efficient analysis of welding thermal conduction using the Newton–Raphson method, implicit method, and their combination

2020 ◽  
Vol 111 (7-8) ◽  
pp. 1929-1940 ◽  
Author(s):  
Zhongyuan Feng ◽  
Ninshu Ma ◽  
Wangnan Li ◽  
Kunio Narasaki ◽  
Fenggui Lu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Hybrid Method ◽  
Thermal Conduction ◽  
Computing Time ◽  
Implicit Method ◽  
Heating Process ◽  
Element Analysis ◽  
Heating And Cooling ◽  
Raphson Method

AbstractFinite element analysis is commonly used to investigate the thermal-mechanical phenomena during welding. To improve the computing efficiency of finite element analysis for welding thermal conduction, a novel Newton–Raphson method (NRM) without the computation of inverse matrix and a hybrid method combing the NRM and conventional implicit method (IMP) were developed. Comparison of computing time between the hybrid method implemented in an in-house software JWRIAN and the IMP used in a commercial software ABAQUS indicated that the computing speed of the former was about 4.5 times faster than that of the latter. Additionally, compared to the conventional IMP, the NRM exhibited higher computing efficiency in the analysis of transient thermal conduction during the welding heating process. Meanwhile, a combined hybrid method of the NRM and IMP was verified to be more efficient in analyzing the welding thermal conduction throughout the heating and cooling processes. Moreover, the thermal cycles computed by the hybrid method were consistent with those from experimental measurement, indicating the high accuracy of the hybrid method. Furthermore, the hybrid method was used to predict the temperature field of the corner boxing fillet joint welded by a low transformation temperature weld metal for generation of compressive residual stress.

Residual stresses in a large circular disc caused by local heating and cooling at its centre

1971 ◽  
Vol 6 (2) ◽  
pp. 89-98 ◽  
Author(s):  
T R Gurney
Keyword(s):  
Residual Stress ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Temperature Distribution ◽  
Stress Distribution ◽  
Residual Stresses ◽  
Local Heating ◽  
Residual Stress Distribution ◽  
Element Analysis ◽  
Heating And Cooling

By means of a form of finite-element analysis and use of a theoretical, radially symmetrical, temperature distribution, the residual stresses resulting from spot heating at the centre of a large circular plate have been calculated. The investigation was concerned in particular with defining the effect of variations in material yield stress, rate of heat input, and peak temperature on the residual-stress distribution.

scholarly journals 3D Finite Element analysis of Laser Surface Glazing to Investigate Temperature Effects on Surface of Ti64 Alloy

2018 ◽  
Author(s):  
Israt Rumana Kabir ◽  
Danqing Yin ◽  
Nusrat Tamanna ◽  
Sumsun Naher
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Significant Role ◽  
Surface Hardness ◽  
Laser Surface ◽  
Element Analysis ◽  
3D Finite Element ◽  
3D Finite Element Analysis ◽  
Heating And Cooling ◽  
Ti64 Alloy

Ti64 alloy plays a significant role in the biomedical applications such as bioimplants for its excellent biocompatibility. Its usage can be further extended by improving the surface hardness and wear resistance. In this respect, laser surface glazing (LSG), an advanced surface modification technique, is very useful which can produce thin hardened surface layer and strong metallurgical bonding. Investigation of temporal and spatial temperature distributions of laser glazed surface of materials are essential because temperature plays significant role in achieving required surface properties. Therefore, in this study, a 3D Finite element analysis has been developed to perform transient thermal analysis of LSG for Ti64 alloy. The model investigated temperature distribution, depth of modified zone and heating and cooling. The results show that the peak temperature is attained 2095 K for 300 W laser power, 0.2 mm beam width and 0.15 ms residence time. Since this temperature is above the melting point (1933 K) of Ti64 alloy, the melt depth is calculated 22.5 μm. Furthermore, from the simulation results, the average heating and cooling rates are estimated 1.19×107 Ks-1 and 2.71×106 Ks-1 respectively which indicate the presence of hard phases in the modified zone.

The Triangular Equilibrium Element in the Solution of Plate Bending Problems

1968 ◽  
Vol 19 (2) ◽  
pp. 149-169 ◽  
Author(s):  
L. S. D. Morley
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Plate Bending ◽  
Complementary Energy ◽  
Element Analysis ◽  
Energy Principle ◽  
The Finite Element Analysis ◽  
Complementary Energy Principle ◽  
Bending Problems

SummaryFurther details are given of a recently developed triangular equilibrium element which is then applied, in conjunction with the complementary energy principle, to the finite element analysis of some plate bending problems. The element is demonstrated to have a straightforward and satisfactory application and to possess advantages over the conventional triangular displacement element.

Finite Element Analysis of Quasi-static Contact Problems Using Minimum Dissipation of the Energy Principle

1994 ◽  
Vol 61 (3) ◽  
pp. 642-648 ◽  
Author(s):  
N. N. Kishore ◽  
A. Ghosh ◽  
S. K. Rathore ◽  
P. V. Kishore
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
A Priori ◽  
Contact Problems ◽  
Computational Time ◽  
Element Analysis ◽  
Element Mesh ◽  
Energy Principle ◽  
Contact Conditions ◽  
Static Contact

There are many practical situations where two bodies are directly in contact and are subjected to dynamic or varying loads. The contact area and the contact conditions are functions of load and load history and are not known a priori at any load thus making the problems nonlinear. The conditions of contact are determined by the kinematic constraints and the Coulomb’s law of friction. Direct solutions do not give unique results if the load steps are large and the finite element mesh is coarse. In the present work a method using the principle of minimum dissipation of energy is proposed and is applied to finite element analysis of a two-dimensional elastic contact problem under quasi-static loading. A combined incremental and iterative procedure is adopted to solve this problem. The results obtained are in good agreement with physical reasoning. The proposed method obtains new results apart from greatly reducing computational time and efforts.

scholarly journals Finite element analysis of a thermally insulated infrared radiant emitter

2018 ◽  
Vol 194 ◽  
pp. 01016
Author(s):  
Anton N. Ermolaev ◽  
Olga V. Khaustova ◽  
Anastasia P. Yakovets
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Thermal Insulation ◽  
Local Heating ◽  
Technical Solution ◽  
Heat And Mass Exchange ◽  
Element Analysis ◽  
Exchange Processes ◽  
Production Areas ◽  
Technical Solutions

The purpose of this work is to analyze the efficiency of the technical solution that is based on thermal insulation of the infrared radiant burner outer surface and to identify of the characteristics of combustion and heat and mass exchange processes. Calculation of the heat balance is performed for thermal capacities of 5, 10, 15, 20, 30, 40 kW and proceeding from the main goal that was to generate directed local heating of workplaces and production areas. We used Ansys Multiphysics software and Fluent CFD solver to implement finite element analysis. Calculation of the thermal insulation layer thickness for a given external surface temperature was additionally performed. The technical solutions offered provides an optimal thermal regime in the whole building and enable us to increase the efficiency of the high temperature infrared radiant emitter to 2-17% and a consequence of the system as a whole.

Online Software Tool for Predicting Weld Residual Stress and Distortion

2008 ◽  
Author(s):  
Yu-Ping Yang ◽  
Wei Zhang ◽  
Wei Gan ◽  
Shuchi Khurana ◽  
Junde Xu ◽  
...  
Keyword(s):  
Residual Stress ◽  
Finite Element Analysis ◽  
Finite Element ◽  
High Performance ◽  
Local Heating ◽  
Welding Parameters ◽  
Analysis Tool ◽  
Element Analysis ◽  
Weld Residual Stress ◽  
Welding Processes

Weld residual stress and distortion are inevitable during welding due to rapid local heating and cooling, high-temperature material reactions and weld-fixture effects. To predict weld residual stress and distortion, an engineer has to understand welding processes and the finite element analysis method. It is difficult for an engineer without finite element background to calculate the weld residual stress and distortion. With the development of weld modeling technology, automatic meshing generation, and high performance computation, a web-based analysis tool (E-Weld Predictor), was developed to predict weld residual stress and distortion. This allows an engineer to calculate the weld residual stress and distortion on line. The engineer does not need to have finite element analysis knowledge to perform the calculation. By providing welding parameters, defining a weld joint, giving geometry dimensions, and specifying a material, weld residual stress and distortion are automatically calculated in a remote high performance computer. A report will then be sent to the engineer to review. This paper introduces the development of E-Weld Predictor. The software structure, the theory, the implementation, and the validation of E-Weld Predictor are discussed in detail. It also shows the simulation process of applying this software in predicting temperature, microstructure, residual stress and distortion.

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