Welding Residual Stress Numerical Simulation of Guyed Mast Earplate Welded Joint

2014 ◽  
Vol 501-504 ◽  
pp. 740-743
Author(s):  
Yi Fei Wang ◽  
Wei Lian Qu ◽  
Wen Li Wang ◽  
Liang Wang ◽  
Bai Feng Ji
Keyword(s):  
Finite Element Method ◽  
Residual Stress ◽  
Finite Element ◽  
Temperature Field ◽  
Heat Source ◽  
Welded Joint ◽  
Welding Residual Stress ◽  
Welding Temperature ◽  
Simulation Results ◽  
Guyed Mast

Fatigue damage of guyed mast earplate welded joint is one of the main failure forms of guyed mast under wind load, and the welding residual stress is a important influence on fatigue performance of the welded joints, therefore, accurate welding residual stresses assessment of earplate welded joint is of great significance to the research on fatigue performance of guyed mast earplate welded joint under wind load. In this paper, welding temperature field of earplate welded joint was simulated by using thermal finite element method and the gauss heat source was used as thermal input. Then, welding residual stress of earplate welded joint was simulated by using thermal elastic-plastic finite element method and the temperature field results were used as the load. The welding temperature field simulation results better reflect the locality of heating, mobility of heat source and instantaneity of heating and cooling process during the welding process. The welding residual stress simulation results show that the residual stress peak of earplate welded joint reaches the yield strength of material, and appears at the dangerous point of earplate welded joint under structural external load. This point under influence of the welding residual stress and structure load is likely to be fatigue crack initiation location.

Welding Residual Stress's Numerical Simulation and Relieving of Guyed Mast Earplate Joint Substructure

2011 ◽  
Vol 216 ◽  
pp. 218-222 ◽  
Author(s):  
Wen Li Wang ◽  
Wei Lian Qu ◽  
Jie He
Keyword(s):  
Numerical Simulation ◽  
Residual Stress ◽  
Temperature Field ◽  
Stress Field ◽  
Residual Stresses ◽  
Welding Residual Stress ◽  
Welding Stress ◽  
Welding Temperature ◽  
Joint Properties ◽  
Guyed Mast

The dynamic stress-strain and welding residual stress during welding are the significant factors which lead to welded cracking and debasement of the joint properties. Therefore, the welding residual stresses are still very importang problems.A large number of guyed mast accidents study shows that the welded joints of earplate and shaft were easily to be destroyed. Therefore, the accurate assessment of the guyed maste earplate joint substructure’s welding residual stress is of great significance. The theory and method of simulation of the welding temperature field and welding stress field by finite element method is first introduced, and then the earplate substructure refine model is established which was up to the welding numerical simulation. Based on ANSYS software’s APDL language to apply the welding heat source load, we can get and save the welding temperature field results at each time. Conversing the thermal analysis element into structure element to finish the caculation of the welding stress field. Eventually by adopting the elimination remnant technology to remove the part of welding residual stresses, we can got the final welding residual stress in different relieving proportion.

Influence of Welding Parameters on Residual Stress in 9% Ni Steel for Low Temperature Service

2010 ◽  
Vol 154-155 ◽  
pp. 1618-1623 ◽  
Author(s):  
Chun Yan Yan ◽  
Wu Shen Li ◽  
Shi Wu Bai
Keyword(s):  
Residual Stress ◽  
Temperature Field ◽  
Welded Joint ◽  
Welding Residual Stress ◽  
Welding Parameters ◽  
Transformation Theory ◽  
Element Analysis ◽  
Heat Transfer Theory ◽  
Longitudinal Residual Stress ◽  
Simulation Results

Based on welding heat transfer theory, heat elastoplasticity theory and phase transformation theory, welding residual stress in multi-layer welded joint of 9% Ni steel for liquefied natural gas (LNG) storage tanks was simulated using SYSWELD finite element analysis software. Taking into account nonlinear relationships between temperature and mechanical properties, together with influence of transformation latent heat on temperature field, double ellipsoid heat source model was applied in the simulation of the three fields (temperature field, microstructure field and stress-strain field). Distribution pattern of welding residual stress in 9%Ni steel welded joint was obtained through numerical simulation. Results showed that heat affected zone (HAZ) showing high-level residual stress was the main stress concentrated part of the welded joint. Longitudinal residual stress appeared to be tensile in the weld and HAZ, and compressive in regions remote from the weld. A match of low heat input and high interpass temperature should be employed to lower residual stress level in HAZ. Simulation results were well consistent with theoretical analysis.

scholarly journals Analysis of Thermal and Welding Residual Stress for Hybrid Welded Joint by Finite Element Method

2007 ◽  
Vol 25 (6) ◽  
pp. 11-16 ◽  
Author(s):  
Hee-Seon Bang ◽  
Chong-In Oh ◽  
Chan-Seung Ro ◽  
Chang-Soo Park ◽  
Han-Sur Bang
Keyword(s):  
Finite Element Method ◽  
Residual Stress ◽  
Finite Element ◽  
Welded Joint ◽  
Welding Residual Stress ◽  
Element Method

Numerical Simulation of Weld Metal by Ultra-Narrow Gap Arc Welding

2011 ◽  
Vol 704-705 ◽  
pp. 728-732
Author(s):  
Li Zhao ◽  
Ke Jie Dai ◽  
Fu Ju Zhang
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Residual Stress ◽  
Finite Element ◽  
Thick Plate ◽  
Welding Residual Stress ◽  
Narrow Gap ◽  
Welding Temperature ◽  
Welding Joint ◽  
Element Method

The ultra narrow gap welding process is suitable to the thick plate, ultra-thick plate welding with the characteristic of highly effective, high quality, low cost, low energy consumption and so on, and is easy to realize the mechanization and the automation. In this paper, the numerical simulation and technical experiment are used to study the form, grow and distribution regulation of the welding temperature field, stress field in welding joint with UNG MAW. Using the calculation to the thickness of 32mm, an example to simulate the magnitude and distribution of the residual stress in welding joint is given. Research shows that it is an effective analysis method to heat process and mechanic behavior in the welding by using finite element method numerical simulation and few experiments. Keywords: UNG MAW, Welding residual stress, Finite element method, Numerical simulation

Study on the Residual Stress Test of Welded Joints for Wind-Driven Generator Base and Numerical Analysis

2011 ◽  
Vol 127 ◽  
pp. 549-554
Author(s):  
Yu Long Shen ◽  
Ji Pu Liu ◽  
Yi Xin Shi ◽  
Bo Dai ◽  
Liang Su ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Residual Stress ◽  
Temperature Field ◽  
Residual Stresses ◽  
Welded Joints ◽  
Stress Test ◽  
Welding Residual Stress ◽  
Test Results ◽  
Welding Temperature ◽  
Time Dynamic

In order to know the concrete distribution of welding residual stresses in Megawatt wind turbine’s basis, Msc.Marc codes by finite element method were applied to simulate temperature and stress field of the base’s welded joints which were appeared on the screen by 3D real-time dynamic numerical, the distribution of welding temperature field and the residual stress is obtained and then the test results of welding residual stress are checked by Blind-hole method. The welding residual stress in the condition of anneal and non-anneal was comparatively analysed. The results show that the transverse and longitudinal residual stresses in the area near the weld are comparatively larger, and the variation trend of the transverse and longitudinal residual stresses in the area far away from the weld are nearly the same. It means that the FEM determination results coinciding with test results are available for reference to the design of the Wind-driven generator welding structure.

Influence of Laser Shock Processing on the Weld Line and Finite Element Simulation

2011 ◽  
Vol 464 ◽  
pp. 627-631
Author(s):  
Jie Zhang ◽  
Ai Hua Sun ◽  
Le Zhu ◽  
Xiang Gu
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Welding Residual Stress ◽  
Laser Shock ◽  
Analysis Software ◽  
Laser Shock Processing ◽  
Element Analysis ◽  
Welding Line ◽  
Simulation Results ◽  
Shock Processing

Welding residual stress is one of the main factors that affect the strength and life of components. In order to explore the effect on residual stress of welding line by laser shock processing, finite element analysis software ANSYS is used to simulate the welding process, to calculate the distribution of welding residual stress field. On this basis, then AYSYS/LS-DYNA is used to simulate the laser shock processing on welding line. Simulation results show that residual stress distributions of weld region, heat-affected region and matrix by laser shock processing are clearly improved, and the tensile stress of weld region effectively reduce or eliminate. The simulation results and experimental results are generally consistent, it offer reasons for parameter optimization of welding and laser shock processing by finite element analysis software.

Temperature Field and Residual Stress Analysis of the Gear on CO2 Laser Welding Process

2011 ◽  
Vol 86 ◽  
pp. 670-673
Author(s):  
Jian Luo ◽  
Fei Li ◽  
Ke Liang Xue ◽  
De Jia Liu ◽  
Hai Wei Zhang
Keyword(s):  
Residual Stress ◽  
Temperature Field ◽  
Laser Welding ◽  
Welding Process ◽  
Welding Residual Stress ◽  
Temperature Cycle ◽  
Residual Tensile Stress ◽  
Welding Seam ◽  
Welding Temperature ◽  
Laser Welding Process

The welding technique is one of important technologies on the gear manufacturing process. The special welding temperature cycle is the basic conditions of the welding residual stress appearance in the gear. The large welding residual stress will create the large deformation after the gear welding, which will affect the gear service behavior. In this paper, the finite element method has used to simulate the gear laser welding process. The temperature field and residual stress has described. The research results show that the biggest residual compressive stress appears on the transverse direction of welding region. In the longitudinal direction, the biggest residual tensile stress appears on both sides of the welding seam line. When the laser welding power is 2.4 kW and welding speed is 20mm/s, the no apparent welding deformation’s 20CrMnSi gear can be achieved really.

Simulation of Welding Residual Stress to the Fracture Strength of Steel Moment-Resist Frame Connection

2011 ◽  
Vol 250-253 ◽  
pp. 3682-3687
Author(s):  
Te Wei Fan
Keyword(s):  
Finite Element Method ◽  
Residual Stress ◽  
Finite Element ◽  
Fracture Strength ◽  
Brittle Failure ◽  
Weld Zone ◽  
Welding Residual Stress ◽  
Failure Behavior ◽  
Element Analysis ◽  
Fracture Models

Inspection made for moment-resist frame connection assembled by welding found that most failures occurred in weld zone between beam and column flange connections, and these failures were caused by cracks initiated at the root of weld. The main reason for the crack initiation is not plastic deformation as expected, and the evaluation results indicated that the major failure mechanism for the brittle failure behavior of moment-resist frame (MRF) connection is caused by the residual stress induced by welding. This paper use finite element method to simulate welding residual stress, and apply them into 3D fracture models. With fracture parameters calculated in finite element analysis, information about fracture strength of MRF connection is acquired.

Temperature Field and Thermal Residual Stress of Grinding GH4169 with Conventional Aluminum Oxide Wheel

2013 ◽  
Vol 589-590 ◽  
pp. 238-244
Author(s):  
Tao Wang ◽  
Guo Ding Chen
Keyword(s):  
Finite Element Method ◽  
Residual Stress ◽  
Finite Element ◽  
Temperature Field ◽  
Aluminum Oxide ◽  
Thermal Residual Stress ◽  
Grinding Temperature ◽  
Grinding Parameters ◽  
Grinding Temperature Field ◽  
Element Method

The constitutive relationship of GH4169 superalloy was investigated. The grinding thermal load acting on GH4169 workpiece in grinding process with conventional aluminum oxide wheel was determined by using the method combining finite element method (FEM) with experiment. The grinding temperature field and grinding thermal residual stress generated in GH4169 were calculated via finite element method (FEM). Finally, the relation between grinding parameters and grinding temperature field and that between grinding parameters and thermal residual stress were discussed.

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