The Line Heating Temperature Field Theory Analysis and Numerical Simulation

2013 ◽  
Vol 316-317 ◽  
pp. 1087-1093
Author(s):  
Wei Zheng Xu ◽  
Shao Chun Zheng ◽  
Xu Dong Han
Keyword(s):  
Temperature Field ◽  
Waste Heat ◽  
Heating Temperature ◽  
Three Dimensional ◽  
Absorption Efficiency ◽  
Transient Temperature ◽  
Heating Process ◽  
Line Heating ◽  
Linear Partial Differential Equations ◽  
Gas Flame

This paper analyzed the endothermic efficiency of the plate in line heating process combing with the need of researching on the recovery of waste heat in the gas flame process. Firstly the non-linear partial differential equations of three-dimensional transient temperature field were derived with the analysis of hexahedron in the plate. Then the temperature field of the plate was numerically simulated using gaussian heat source heat flux model with ANSYS software. Finally the heat absorption efficiency formula of the plate was derived based on the finite volume method. The endothermic efficiency model in this paper provides a basis for further analysis of the whereabouts of the heat released in line heating process in theory.

Modified Strip Model for Analyzing the Line Heating Method-Part 1: Elastic Plates

1991 ◽  
Vol 35 (02) ◽  
pp. 172-182
Author(s):  
Jong Gye Shin ◽  
Amiram Moshaiov
Keyword(s):  
Strain Field ◽  
Three Dimensional ◽  
Past Research ◽  
Stress Fields ◽  
Transient Temperature ◽  
Heating Process ◽  
Elastic Strip ◽  
Elastic Plates ◽  
Line Heating ◽  
Heating Method

The line heating method can be most useful in the automation of plate forming and for removal of undesired residual distortions during shipbuilding. The three-dimensional transient temperature and stress fields complicate the problem of simulating the line heating process. In past research efforts, a strip model taken perpendicular to the heated line was used. However, recent experimental and theoretical works have demonstrated the need for a different model. Recognizing that the existing strip model cannot be used effectively in the analysis of the stress-strain field during the line heating process, a modified strip model is suggested. In Part 1 of this paper, the concept of a modified strip is introduced by developing a theory for an elastic modified strip. The results of selected examples show that the modified strip model gives excellent results for elastic plates in comparison with a regular strip model. In Part 2 (to be published in a later issue of JSR), the theory is extended to the thermo-elastic-plastic modified strip. The concept of a modified elastic strip may have other useful applications and therefore is highlighted separately.

Efficient Algorithms for Inspection and Reforming of Double-Curved Plates in Line-Heating Process

2006 ◽  
Vol 22 (03) ◽  
pp. 184-193
Author(s):  
Yujun Liu ◽  
Zhuoshang Ji ◽  
Yanping Deng ◽  
Jun Zhang ◽  
Ji Wang
Keyword(s):  
Manufacturing Process ◽  
Three Dimensional ◽  
Efficient Algorithms ◽  
Heating Process ◽  
Line Heating ◽  
Technical Parameters ◽  
Error Analyses ◽  
Metal Plates ◽  
Plate Formation ◽  
Prospective Application

Line heating is an effective and economical method for forming metal plates into three-dimensional shaped plates for ships, trains, and airplanes. When a curved plate subject to deformation is formed in line-heating process, the deformed shape is repeatedly inspected and reformed to reach the designed shape. Efficient automatic inspection and reforming processes are essential to enhance productivity in the whole manufacturing process. In this paper, efficient algorithms for inspection and reforming of double-curved plates are introduced. These algorithms have been developed to automatically inspect the transverse and longitudinal shape of plate surfaces and provide technical parameters to reform the unformed plates. The longitudinal shape of the plate surface is examined based on a shell plate development with plastic deformation during the plate formation, and the transverse shape is inspected through error analyses of transverse curvature radiuses. How to use the inspection results to reform unformed plates is discussed. In the end, experiments are performed with comparison to the current industrial plate manufacture, and results show a prospective application of our algorithms to the practical manufacturing of doublecurved plates. The methods presented in this study may play a role in realizing the automation of the entire curved-plate manufacturing process.

Coupling Numerical Simulation of Resin Matrix Composites about Temperature and Degree of Cure Fields by Hot-Press Forming

2013 ◽  
Vol 788 ◽  
pp. 43-47
Author(s):  
Fei Sun ◽  
Dun Ming Liao ◽  
Peng Xu ◽  
Chang Chun Dong
Keyword(s):  
Three Dimensional ◽  
Exothermic Peak ◽  
Resin Matrix ◽  
Transient Temperature ◽  
Heating Process ◽  
Curing Process ◽  
Hot Press ◽  
Degree Of Cure ◽  
Resin Matrix Composite ◽  
The Impact

In this paper, a coupled numerical model of three-dimensional transient temperature field and degree of cure field for resin matrix composite curing process was developed. Using this model the hot-press curing process of the plate-shaped composite parts were simulated with considering the impact of tools and auxiliary materials. Thus, the temperature and degree of cure fields distribution in the entire process cycle were obtained. Numerical results show that the curing of the composite has a certain sequence. At the beginning, the composite is first curing at the boundary and gradually to the center. At the end stage, because of the higher curing rate, the center released a large amount of heat which makes the boundary curing simultaneously with center. In addition, there is a significant exothermic peak during the curing process. And the peak temperature is higher when it was closer to the center. This research effectively provides reference for optimizing the heating process parameters to improve product quality.

Numerical Simulation of Three-Dimensional Molten Pool Temperature Field and Flow Field for Laser Melt Injection Based on Fluent

2012 ◽  
Vol 538-541 ◽  
pp. 1837-1842 ◽  
Author(s):  
Long Zhi Zhao ◽  
Zi Wang ◽  
Xin Yan Jiang ◽  
Jian Zhang ◽  
Ming Juan Zhao
Keyword(s):  
Temperature Field ◽  
Liquid Metal ◽  
Molten Pool ◽  
Metal Flow ◽  
Three Dimensional ◽  
Transient Temperature ◽  
Transient Temperature Field ◽  
Liquid Metal Flow ◽  
Fluent Software ◽  
Thermo Physical Properties

According to the characteristics of laser melt injection, a numerical model for a simplified 3D transient temperature field in molten pool was established using FLUENT software in this paper. In the model, many factors were considered such as liquid metal turbulence, latent heat of phase transformation and material thermo physical properties depending on temperature. The results show that the model can be developed well by FLUENT software. And the results also show that the driving force of the liquid metal flow mechanism.

Development of Computer-Aided Process Planning System for Plate Bending by Line Heating (Report 3)—Relation Between Heating Condition and Deformation

1994 ◽  
Vol 10 (04) ◽  
pp. 248-257 ◽  
Author(s):  
Yukio Ueda ◽  
Hidekazu Murakawa ◽  
Ahmed Mohamed Rashwan ◽  
Isao Neki ◽  
Ryoichi Kamichika ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Planning System ◽  
Heating Process ◽  
Plate Bending ◽  
Heating Condition ◽  
Line Heating ◽  
Computer Aided Process Planning ◽  
Dimensional Finite Element ◽  
General Relations ◽  
Three Dimensional Finite Element

An effective plate bending process by line heating can be achieved when the heating conditions are properly selected to produce desirable bending or inplane deformations. To make such decisions on he heating condition, the relation between heating conditions and deformations must be clarified. For his purpose, the authors studied the similarity rule which holds for the line heating process and derived wo parameters governing the deformations. Also, they developed new three-dimensional finite-element method codes as versatile tools to replace costly experiments. The validity of these codes is examined through comparison with an experiment, and they are applied to study the general relations between he parameters and the deformations of plates.

Three-dimensional transient temperature field model for laser annealing

2005 ◽  
Vol 97 (3) ◽  
pp. 033520 ◽  
Author(s):  
Jean-Yves Degorce ◽  
Jean-Numa Gillet ◽  
François Magny ◽  
Michel Meunier
Keyword(s):  
Temperature Field ◽  
Laser Annealing ◽  
Field Model ◽  
Three Dimensional ◽  
Transient Temperature ◽  
Transient Temperature Field ◽  
Temperature Field Model

Modeling of the Temperature Field during Electron Beam Welding of Aluminum Alloy by a Pre-Defined Keyhole

2007 ◽  
Vol 353-358 ◽  
pp. 2011-2014
Author(s):  
Yan Hong Tian ◽  
Chun Qing Wang ◽  
Dan Yang Zhu
Keyword(s):  
Temperature Field ◽  
Electron Beam ◽  
Heat Source ◽  
Electron Beam Welding ◽  
Three Dimensional ◽  
Source Model ◽  
Transient Temperature ◽  
Al Alloy ◽  
Welding Pool ◽  
Welding Line

The transient temperature field of Al alloy during electron beam welding (EBW) process was simulated using a three-dimensional finite element method. Different from the most previous models which were based on the assumption that the welding pool was solid and neglected the existence of keyhole by meshing the solid as a whole, a dynamic three-dimensional keyhole was applied in this model. The profile of the keyhole was ellipse and its size was determined before simulation based on the results of experiments. Following the heat source, the pre-defined keyhole moved along the welding line. A three-dimensional complex heat source model, including a modified Gaussian distribution source and a uniform source, was used in this study. The result shows that the shape of the keyhole had a direct effect on the temperature distribution and contribution to the special shape of the welding pool in EBW.

scholarly journals Research on Model Slice and Forming Method of Thin-walled Parts

2021 ◽  
Vol 233 ◽  
pp. 04046
Author(s):  
Changhao Zhang ◽  
Hu Li ◽  
Jianyu Yang ◽  
Huawei Lu ◽  
Peng Su
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Structural Characteristics ◽  
Three Dimensional ◽  
Simulation Method ◽  
Processing Parameters ◽  
Transient Temperature ◽  
Transient Temperature Field ◽  
Thin Walled ◽  
Experimental Processing

According to the structural characteristics of thin-walled parts, a model slicing method is proposed, and its mathematical process is established. The three-dimensional transient temperature field in the process of synchronous powder feeding laser cladding is studied and verified by numerical simulation method, and the thin-walled parts formed by later experimental processing are processed by the results of numerical simulation. Using the simulation results of temperature field as the basis for optimizing the processing parameters, the forming path of thin-walled parts is programmed and optimized, and the experimental verification shows the reliability of this method.

The Influence of Thermophysical Properties on a Numerical Model of Solidification

2002 ◽  
Author(s):  
Josef Stetina ◽  
Frantisek Kavicka ◽  
Bohumil Sekanina ◽  
Jaromir Heger
Keyword(s):  
Temperature Field ◽  
Numerical Model ◽  
Thermophysical Properties ◽  
Three Dimensional ◽  
Casting Process ◽  
Transient Temperature ◽  
Treatment Processes ◽  
Transient Temperature Field ◽  
Simultaneous Heating ◽  
Liquid States

Solidification and cooling of a (con)casting, with the simultaneous heating of the mold, is a case of transient spatial heat and mass transfer. This paper introduces an original and universal numerical model of solidification, cooling and heating, of a one-to-three-dimensional stationary and transient temperature field in a system comprising the casting, the mold and its surroundings. This model simulates both traditional as well as non-traditional technologies of casting conducted in foundries, metallurgical plants, forging operations, heat-treatment processes, etc. The casting process is influenced not only by the thermophysical properties (i.e. heat conductivity, the specific heat capacity and density in the solid and liquid states) of the metallic and non-metallic materials, but also by the precision with which the numerical simulation is conducted. Determining these properties is often more demanding than the actual calculation of the temperature field of the solidifying object. Since the influence of individual properties should be neither under- nor over-estimated, it is necessary to investigate them via a parametric study. It is also necessary to determine the order of these properties in terms of their importance.

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