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.

Effects of Sheet Thickness on Residual Stress Distribution by Laser Shock Processing of 7050-T7451 Aluminum Alloy

2011 ◽  
Vol 189-193 ◽  
pp. 3778-3781
Author(s):  
Yin Fang Jiang ◽  
Lei Fang ◽  
Zhi Fei Li ◽  
Zhen Zhou Tang
Keyword(s):  
Finite Element ◽  
Aluminum Alloy ◽  
Stress Distribution ◽  
Residual Stresses ◽  
Sheet Thickness ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Element Analysis ◽  
Finite Element Software ◽  
Shock Processing

Laser shock processing is a technique similar to shot peening that imparts compressive residual stresses in materials for improved fatigue resistance. Finite element analysis techniques have been applied to predict the residual stresses from Laser shock processing. The purpose of this paper is to investigate of the different sheet thickness interactions on the stress distribution during the laser shock processing of 7050-T7451 aluminum alloy by using the finite element software. The results indicate that the sheet thickness has little effects on the compression stress in the depth of sheet, but great impacts on the reserve side.

Simulation on Laser Shock Strengthening of the Crankshaft

2011 ◽  
Vol 121-126 ◽  
pp. 2304-2307
Author(s):  
Tie Jun Wu ◽  
Hong Jun Wang
Keyword(s):  
Experimental Data ◽  
Residual Stress ◽  
Simulation Method ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Ansys Simulation ◽  
Element Simulation ◽  
Simulation Results ◽  
Simulation Parameters ◽  
Shock Processing

The residual stress distribution of fillet of the diesel engine crankshaft on laser shock processing was analyzed by ANSYS software. The simulation results compared with the experimental data, to get results as follows: the simulation results were basically consistent with the experimental data. This fully proved that the finite element simulation method and related simulation parameters were correct. The parameters of laser impacting were optimized by ANSYS simulation, and the residual stress favorable distribution of the crankshaft fillet was obtained.

Study on residual stress of AISI304 TIG welding line with laser shock processing by x-ray stress analyzer

2006 ◽  
Author(s):  
Y. K. Zhang ◽  
D. J. Kong ◽  
S. M. Yin ◽  
A. X. Feng ◽  
J. Z. Lu ◽  
...  
Keyword(s):  
Residual Stress ◽  
Tig Welding ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
X Ray ◽  
Welding Line ◽  
Shock Processing

Comparison of Stress Filed and Deformation of MAG and TIG for Cr13 Based on Finite Element

2015 ◽  
Vol 1095 ◽  
pp. 711-716
Author(s):  
Yun Xian Mao ◽  
Meng Qi Yang ◽  
Hai Rui Yue ◽  
Hui Yang ◽  
Z.G. Li ◽  
...  
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Dominant Role ◽  
Butt Joint ◽  
The Other ◽  
Analysis Software ◽  
Element Analysis ◽  
Welding Seam ◽  
The Finite Element Analysis ◽  
Simulation Results

This paper took flat butt joint based on Cr13 as a sample, in which TIG and MAG were adopted respectively, and analyzed qualitatively the simulation results of temperature field, stress field and deformation distribution by the finite element analysis software ANSYS. The simulating results indicate that residual transverse press stress plays a dominant role near the beginning and the end of the welding seam, that residual longitudinal pull stress is dominant in the other region of welding seam. The residual stress of MAG is higher than that of TIG. Nevertheless, the deformation of MAG is lower than that of TIG.

Numerical Simulation of Fatigue Life on MSC.Fatigue and ABAQUS

2010 ◽  
Vol 43 ◽  
pp. 624-627
Author(s):  
Jie Zhang ◽  
Xiang Gu ◽  
Hai Wei Ye ◽  
Kang Wen Li
Keyword(s):  
Numerical Simulation ◽  
Residual Stress ◽  
Finite Element ◽  
Fatigue Life ◽  
Fatigue Test ◽  
Surface Hardening ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Shock Processing ◽  
Important Significance

Laser Shock Processing (LSP) is a kind of new surface hardening technology, which can increase fatigue life obviously. Due to the LSP, the residual stress is generated and dislocations increase obviously in the surface of specimen, so the fatigue life of specimen processed by LSP increases. Thanks to the finite element programs, it is able to simulate the fatigue life. The simulation of fatigue life has important significance, which not only can reduce the costs of fatigue test and research, but also further study the effect of LSP on fatigue life. The results of fatigue test coincide with the results of simulation.

Nonlinear Dynamic Response of Buoys under the Collision Load with Ships

2012 ◽  
Vol 204-208 ◽  
pp. 4455-4459 ◽  
Author(s):  
Liu Hong Chang ◽  
Chang Bo Jiang ◽  
Man Jun Liao ◽  
Xiong Xiao
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Analysis Software ◽  
Element Analysis ◽  
Nonlinear Dynamic Response ◽  
Dynamic Finite Element ◽  
Simulation Results ◽  
Collision Force ◽  
Explicit Dynamic ◽  
Element Theory

The explicit dynamic finite element theory is applied on the collision of ships with buoys for computer simulation. Using ANSYS/LS-DYNA finite element analysis software, the numerical simulation of the collision between the ton ship and the buoy with different structures and impact points. The collision force, deformation, displacement parameters and the weak impact points of a buoy are obtained. Based on the numerical simulation results, analysis of buoys and structural collision damages in anti-collision features are discussed, and several theoretical sugestions in anti-collision for the design of buoy are provided.

High Dense Compressive Residual Stress Produced in Laser Shock Processing on Ti6Al4V Alloys

2007 ◽  
Vol 353-358 ◽  
pp. 1617-1620 ◽  
Author(s):  
Xu Dong Ren ◽  
Yong Kang Zhang ◽  
Jian Zhong Zhou ◽  
Yong Yu Gu ◽  
Y.Y. Xu ◽  
...  
Keyword(s):  
Residual Stress ◽  
Fatigue Crack ◽  
Surface Stress ◽  
Compressive Residual Stress ◽  
High Energy ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Large Spot ◽  
Small Spot ◽  
Shock Processing

Laser shock processing (LSP) employs high-energy laser pulses from a solid-state laser system to create intense shock waves into a material, which can induce compressive residual stresses in the target surface and improve its mechanical property efficiency. Residual stress of Ti6Al4V alloy both before and after LSP with multishocks was analysised. The depth of compressive residual stress was found to have a dependence on the number of shocking layers and a slight dependence on the level of irradiance. Surface stress improvements of more than 50% increases are possible after laser shock processing with either large spot or small spot patterns. The large spot gave a surface stress of 432MPa and a depth of over 1mm. The low intensity small spot gave a surface stress of 285MPa with a depth comparable to the large spot. Laser shock processing induces a compressive residual stress field, which increases fatigue crack initiation life and reduces fatigue crack growth rate.

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