scholarly journals Measurement of Welding Residual Stress in a 25-mm Thick Butt Joint using Inherent Strain Method

2013 ◽  
Vol 31 (4) ◽  
pp. 67-72 ◽  
Author(s):  
Jeong-Ung Park ◽  
Gyu-Baek An ◽  
Wanchuck Woo ◽  
Seung-Min Heo
Keyword(s):  
Residual Stress ◽  
Butt Joint ◽  
Welding Residual Stress ◽  
Inherent Strain ◽  
Inherent Strain Method ◽  
Strain Method

Research on Deformation Prediction Method of Laser Melting Deposited Large-Sized Parts Based on Inherent Strain Method

2021 ◽  
Vol 871 ◽  
pp. 65-72
Author(s):  
Cheng Hong Duan ◽  
Xian Kun Cao ◽  
Ming Huang Zhao ◽  
Xiang Peng Luo
Keyword(s):  
Residual Stress ◽  
Laser Energy ◽  
Layer By Layer ◽  
Laser Melting ◽  
Forming Process ◽  
Deformation Prediction ◽  
Metal Parts ◽  
Inherent Strain ◽  
Inherent Strain Method ◽  
Strain Method

In the process of metal parts fabricated by Laser Melting Deposition (LMD), a high temperature gradient will generate due to the instantaneous high laser energy input, which will cause residual stress in the formed part of metal parts, the residual stress will result in defects like warping deformation or even cracking. In this paper, a finite element method based on inherent strain method is proposed to predict the deformation of metal parts fabricated by LMD. Firstly, combing with the birth and death element technology, a local model is established to simulate the layer-by-layer deposition in the LMD forming process, and the values of inherent strain is obtained. Secondly, the obtained inherent strain values is applied to large-sized part layer by layer, and the final deformation of large-sized part is calculated. Based on the proposed method, the efficiency of deformation prediction of large-sized metal parts fabricated by LMD could be effectively improved.

Effect of welding residual stress on plastic buckling of axially compressed cylindrical shells with patterned welds

2012 ◽  
Vol 226 (10) ◽  
pp. 2381-2392 ◽  
Author(s):  
Chulin Yu ◽  
Zhiping Chen ◽  
Ji Wang ◽  
Shunjuan Yan ◽  
Licai Yang
Keyword(s):  
Residual Stress ◽  
Cylindrical Shells ◽  
Welding Residual Stress ◽  
Displacement Curve ◽  
Residual Stress Field ◽  
Plastic Buckling ◽  
Circumferential Welds ◽  
Stress Variation ◽  
Inherent Strain ◽  
Inherent Strain Method

An experimental–numerical investigation of the effect of welding residual stress on plastic buckling of axially compressed cylindrical shells with patterned welds is carried out. Two cylindrical shell specimens with different pattern of welds are made according to manufacturing process used in engineering. Their initial geometric imperfections, axial and circumferential strain, buckling load, etc., are experimentally obtained. Inherent strain method used for simulating welding residual stress field is presented. Two different numerical modeling methods for the purpose of evaluating the effect of welding residual stress on plastic buckling are illustrated and the validity is verified by experiment. It is found that, load–displacement curve before buckling is altered, plastic buckling critical load is decreased to some extent, and the buckling deformation such as the number and the uniformity of waveforms of circumferential welds are changed when welding residual stress exists. For the above phenomena, the reason why welding residual stress has an influence on plastic buckling is also quantitatively analyzed from the point of stress variation.

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