Research of Explosive Welding: Numerical Simulation and Analysis

2013 ◽  
Vol 668 ◽  
pp. 560-564 ◽  
Author(s):  
Xiao Xu Wang ◽  
Jin Xiang Wang ◽  
Yong He
Keyword(s):  
Temperature Field ◽  
Explosive Welding ◽  
Propagation Distance ◽  
Physical Parameters ◽  
Finite Element Program ◽  
Welding Temperature ◽  
Heat Transfer Theory ◽  
Particle Hydrodynamics ◽  
Element Program ◽  
Wavy Interface

To improve understanding of explosive welding and relate the effect of the process variables on the physical parameters, the smooth particle hydrodynamics (SPH) method in the LS-DYNA 12.0 finite element program was adopt to simulate the process of two-layer steel explosive welding. Temperature field near the stagnation point was calculated according to the work-heat transfer theory. Finally, the formation mechanism of the interface wave was analyzed under the condition that strain field, temperature field etc. were considered. The results show that: the phenomenon of jetting and the interfacial waves observed in explosive welding were quite well reproduced in these simulations; the changing collision angle with propagation distance is directly responsible for the change in interface morphology from wavy to smooth at the welding front; the maximum stress ,strain and temperature are localised at the wavy interface zone; the maximum temperatures near the interface will be high enough under proper conditions and this will be helpful for the formation of the jet and the wavy interface.

Shape and Size Optimization Design of Finned Brass Tube on the Central Air Conditioning

2012 ◽  
Vol 588-589 ◽  
pp. 1854-1857
Author(s):  
Shuang Chen ◽  
Bing Yan Zhang ◽  
Jian Hua Zhong
Keyword(s):  
Heat Transfer ◽  
Transfer Process ◽  
Optimization Design ◽  
Heat Transfer Process ◽  
Finned Tube ◽  
Structure Parameters ◽  
Finite Element Program ◽  
Fin Efficiency ◽  
Heat Transfer Theory ◽  
Element Program

Finned tube heat transfer process was analyzed in this thesis, the optimal mathematical model of the fin efficiency and fin volume which was acted as the objective function is established based on the model of heat transfer theory. The heat exchanger numerical simulation of finned tube is taken by the ANSYS finite element program in heat transfer process, and the finned tube structure parameters ( fin spacing , fin thickness , fin height) were analyzed , the optimum structure parameters of a set of finned tube were obtained at the same time. These studies will have some guidance on the application of finned tubes.

Numerical Studies of Explosive Welding by SPH

2007 ◽  
Vol 566 ◽  
pp. 61-64 ◽  
Author(s):  
Katsumi Tanaka
Keyword(s):  
Explosive Welding ◽  
High Speed ◽  
Weld Interface ◽  
Oblique Impact ◽  
Major Mechanism ◽  
Particle Hydrodynamics ◽  
Detached Shock Wave ◽  
Smoothed Particle ◽  
Wavy Interface ◽  
Karman Vortex

A particular characteristic of an explosively produced weld is that the profile of the weld interface often has a regular wavy appearance. An effect of detached shock wave and jetting on the metal interface of explosive welding has been shown by SPH (Smoothed particle hydrodynamics). Numerical results show wavy interface which is observed in several experiments. High speed jet between interface and Karman vortex after oblique impact of a flyer plate to a parent plate were major mechanism of explosive welding.

Temperature Control of Massive Concrete for Construction of Pier’s Base

2011 ◽  
Vol 71-78 ◽  
pp. 4134-4137
Author(s):  
Ya Xun Yang
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Temperature Control ◽  
Calculation Result ◽  
Control Program ◽  
Hydration Heat ◽  
Finite Element Program ◽  
Massive Concrete ◽  
Concrete Temperature ◽  
Element Program

For the hydration heat generated by the massive concrete during the construction of the pier’s base, the methods and operation processes of temperature control are presented in this article, using the finite element program MIDAS analyze the massive concrete temperature field of the hydration heat during the construction of the base. Besides, temperature control program for the construction of massive concrete, simulation of the calculation result and controlling calculation following the process of the construction compared with the data of temperature monitoring are introduced. The result of analysis and calculation could be a reference for the similar construction.

Temperature Field Simulation of Electron Beam Surface Quenching on Ductile Iron QT600-3

2011 ◽  
Vol 228-229 ◽  
pp. 1118-1124
Author(s):  
De Qiang Wei ◽  
Yun Zhi Yi ◽  
Rong Wang
Keyword(s):  
Temperature Field ◽  
Electron Beam ◽  
Ductile Iron ◽  
Element Model ◽  
Processing Parameters ◽  
Physical Parameters ◽  
Fem Model ◽  
Heat Transfer Theory ◽  
Surface Quenching ◽  
Beam Surface

According to the actual experimental condition of the scanning electron beam welder, a 3-D finite element model(FEM) model of the temperature field for the electron beam quenching of ductile iron QT600-3 was established by using ANSYS parametric design language. In the course of analysis, the heat transfer theory was applied. The temperature relativity of the thermal physical parameters, the phase transformation and thermal radiation were considered. The size of the hardened zone was calculated and experimented. The results show that the obtained experimental results show a good agreement with the simulation results. It indicates that the established numerical model is correct and reliable. The model provides a guide for studying the rule which it is heating and solidifying process of electron beam surface quenching. And the FEM model can be well used to obtain and optimize the processing parameters.

Temperature Field Calculation and Analysis within Steel Tube Reinforced Columns

2011 ◽  
Vol 243-249 ◽  
pp. 5089-5093 ◽  
Author(s):  
Lei Xu ◽  
Yu Bin Liu
Keyword(s):  
Temperature Field ◽  
Theoretical Models ◽  
Steel Tube ◽  
Area Ratio ◽  
Core Area ◽  
Field Calculation ◽  
Steel Tubes ◽  
Finite Element Program ◽  
Element Program ◽  
Rising Time

Theoretical models to calculate the temperature field steel tubes reinforced columns are proposed by finite element program in this paper. The theoretical results are validated by test results, and they have a good agreement. Using the theoretical models, the influencing laws of temperature rising time; section perimeter; steel reinforcement ratio and sectional core area ratio on temperature field are further discussed. It has been found that the surface temperatures of steel tube reinforced columns increase obviously with temperature rising time, and the temperatures of steel tubes and core concrete increase slowly. The effects of sectional dimension and sectional core area ratio on temperature field are significant, but steel ratio has very little effect on temperature both of steel tube and of sectional center. These achievements make it possible to study further theoretical study on the mechanic performance of steel tube reinforced concrete columns in fire.

The Numerical Simulation of a Bird-Impact on an Aircraft Windshield by Using the SPH Method

2008 ◽  
Vol 33-37 ◽  
pp. 851-856 ◽  
Author(s):  
Jun Liu ◽  
Yu Long Li ◽  
Fei Xu
Keyword(s):  
Failure Model ◽  
Smooth Particle Hydrodynamics ◽  
Sph Method ◽  
Finite Element Program ◽  
Explicit Finite Element ◽  
Particle Hydrodynamics ◽  
Bird Impact ◽  
Element Program ◽  
Simulation Results ◽  
Good Agreement

This paper is focused on the development of an effective numerical method to simulate bird-impact aircraft windshield events. A new Smooth Particle Hydrodynamics (SPH) which has been incorporated as a solver option into the explicit finite element program PAM-CRASH was used to model the bird. The deformation between the numerical results and the experimental results is in good agreement. Simulation results of a bird-impact process indicated that the SPH bird model is more suitable to model the break-up of the bird into particles. Failure of the windshield in the experiment was simulated, and the good agreement between the numerical and experiment indicates that the failure model established in the present paper is reasonable. Finally, the energy changes of the bird and the windshield were calculated.

Friction Force and Stresses Analysis for Contact of Assembled Details

2006 ◽  
Vol 113 ◽  
pp. 334-338
Author(s):  
Z. Dreija ◽  
O. Liniņš ◽  
Fr. Sudnieks ◽  
N. Mozga
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Plastic Deformation ◽  
Friction Force ◽  
Sliding Friction ◽  
Friction Model ◽  
Contact Interface ◽  
Finite Element Program ◽  
Elastic Plastic ◽  
Element Program

The present work deals with the computation of surface stresses and deformation in the presence of friction. The evaluation of the elastic-plastic contact is analyzed revealing three distinct stages that range from fully elastic through elastic-plastic to fully plastic contact interface. Several factors of sliding friction model are discussed: surface roughness, mechanical properties and contact load and areas that have strong effect on the friction force. The critical interference that marks the transition from elastic to elastic- plastic and plastic deformation is found out and its connection with plasticity index. A finite element program for determination contact analysis of the assembled details and due to details of deformation that arose a normal and tangencial stress is used.

scholarly journals The impact of drilling and slitting construction on damage field: evolution characteristics in low-permeability coal seam

2021 ◽  
Vol 37 ◽  
pp. 205-215
Author(s):  
Heng Chen ◽  
Hongmei Cheng ◽  
Aibin Xu ◽  
Yi Xue ◽  
Weihong Peng
Keyword(s):  
Finite Element ◽  
Rock Mass ◽  
Damage Mechanics ◽  
Effective Strain ◽  
Secondary Development ◽  
Distribution Area ◽  
Finite Element Program ◽  
Element Program ◽  
Mining Face ◽  
The Impact

ABSTRACT The fracture field of coal and rock mass is the main channel for gas migration and accumulation. Exploring the evolution law of fracture field of coal and rock mass under the condition of drilling and slitting construction has important theoretical significance for guiding efficient gas drainage. The generation and evolution process of coal and rock fissures is also the development and accumulation process of its damage. Therefore, based on damage mechanics and finite element theory, the mathematical model is established. The damage variable of coal mass is defined by effective strain, the elastoplastic damage constitutive equation is established and the secondary development of finite element program is completed by FORTRAN language. Using this program, the numerical simulation of drilling and slitting construction of the 15-14120 mining face of Pingdingshan No. 8 Mine is carried out, and the effects of different single borehole diameters, different kerf widths and different kerf heights on the distribution area of surrounding coal fracture field and the degree of damage are studied quantitatively. These provide a theoretical basis for the reasonable determination of the slitting and drilling arrangement parameters at the engineering site.

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