Investigation of welding residual stress distribution in a thick-plate joint with an emphasis on the features near weld end-start

Liang, Wei; Murakawa, Hidekazu; Deng, Dean

doi:10.1016/j.matdes.2014.11.037

Cited by 51 publications

(19 citation statements)

References 20 publications

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“…There are four welds in the box girder of the node, and the length of each weld is 4 m. The welding simulation is carried out in the same manner as with the factory process; the heating time is 1720 s, the cooling time is 1500 s, and the total welding time is 3220 s. Fig.8 shows the results of the temperature field on the joint at a given time. It can be seen from the chart that the heat gradually moves along with time, and that the welding temperature field distribution is non-uniform; the maximum temperature the heat source reaches is 1829 °C , which is realistic representation of the actual welding temperature [38] ; the temperature decreases rapidly when the heat source passes through. Moreover, the isotherm near the heat source is as prescribed close to an ellipse.…”

Section: Welding Parameters Of Electric Arc Weldingmentioning

confidence: 99%

Research on extending the fatigue life of railway steel bridges by using intelligent control

Liu

Nikitas

et al. 2018

Construction and Building Materials

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This paper investigates the potential of a vibration control-inspired method towards extending the fatigue life of railway steel bridges. Based on coupled thermal-mechanical and vehicle-track analysis, both the residual stresses from welding and these from traffic on the bridge are obtained. Subsequently, a multi-scale approach with a shell Finite Element (FE) model of the whole bridge and a solid FE model of its critical joints is put forward. The equation of motion is established for the controlled bridge, equipped with a Magnetorheological-Tuned Mass Damper (MR-TMD) system, while the combination of excitation, welding and control effects is practiced through own-developed packages and commercial software sub-model routines. The framework is showcased for the study of the Poyang Lake Railway Bridge in China. After obtaining the controlled stress states at the critical welded joint, the fatigue crack initial life is evaluated by using the critical plane method and the linear cumulative damage theory. Simulation results indicate that the multi-scale modelling approach followed, meets the accuracy needs for capturing the cracking process of the welded joint with high computational efficiency. The MR-TMD system, even when moderately reducing the critical joint stress amplitudes, can improve substantially the overall bridge fatigue resistance over the uncontrolled structure.

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Section: Welding Parameters Of Electric Arc Weldingmentioning

confidence: 99%

Research on extending the fatigue life of railway steel bridges by using intelligent control

Liu

Nikitas

et al. 2018

Construction and Building Materials

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“…If one could a priori assume the main stress axis orientation, the presented set of data would be satisfactory (it is e.g. the case of point [1,3] where on the basis of welding thermodynamics models one expects tension parallel to the seam [20]). In a general case, however, one has to know the set of three values (e.g.…”

Section: Case Study-strain and Stress Distribution Determination In Tmentioning

confidence: 99%

A fast procedure of stress state evaluation in magnetically anisotropic steels with the help of a probe with adjustable magnetizing field direction

Chmielewski

Piotrowski

Augustyniak

2017

Meas. Sci. Technol.

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components (tanks, girders etc). The surface stress components i.e. the values and directions of the main stresses (σ 1 , σ 2) may be determined with the help of the hole drilling method, or x-ray diffraction analysis [1]. The information obtained in such a way is 'local' and the measurement time in both cases is relatively long. Being so, neither one of those methods can be recommended for the analysis of the spatial distribution of the stress state (obtaining a dense enough matrix of data in an acceptable amount of time). The search for the method that

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“…As the mushy zone solidifies, the base metal thermo-mechanically reacts to the thermal shrinkage and solidification shrinkage of the weld, and also temperature variations in the heat affected zone, evolving a transient thermo-mechanical force field that distorts the mushy zone [7,[33][34][35]. Concurrently, the mushy zone can deform as a result of the restraining forces applied to the base metal [36].…”

Section: Calculation Of the Global Strain Ratementioning

confidence: 99%

3-D multi-scale modeling of deformation within the weld mushy zone

Rajani

Phillion

2016

Materials & Design

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The deformation of the fusion weld mushy zone, as a critical factor in solidification cracking, has been simulated by combining a 3D multi-scale model of solidification and microstructure with a deformation model that includes the effects of solidification shrinkage, thermo-mechanical forces and restraining forces. This new model is then used to investigate the role of welding parameters on the deformation rate of micro liquid channels during Gas Tungsten Arc welding of AA6061. It is shown that the internal normal deformation rate due to solidification shrinkage and also the external normal deformation rate caused by external forces are both highest for the micro liquid channels at the center of the mushy zone where solidification cracks usually occur. Furthermore, the model shows that welding travel speed and welding current strongly influence the deformation rate of the weld mushy zone and consequently the solidification cracking susceptibility of the weld. The model can be also used to link micro-scale phenomena with the macro-scale characteristics of solidification cracking during welding.

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Investigation of welding residual stress distribution in a thick-plate joint with an emphasis on the features near weld end-start

Cited by 51 publications

References 20 publications

Research on extending the fatigue life of railway steel bridges by using intelligent control

Research on extending the fatigue life of railway steel bridges by using intelligent control

A fast procedure of stress state evaluation in magnetically anisotropic steels with the help of a probe with adjustable magnetizing field direction

3-D multi-scale modeling of deformation within the weld mushy zone

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