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In-plane shrinkage strains and their effects on welding distortion in thin-wall structures

Cheng, Wentao
http://rave.ohiolink.edu/etdc/view?acc_num=osu1124049585

Abstract Details

2005, Doctor of Philosophy, Ohio State University, Welding Engineering.
It is difficult to achieve both fast and accurate distortion predictions in large welded structures. This research work was conducted to obtain better understanding and characterization of the plastic deformation that leads to in-plane shrinkage in thin-wall structures. It also aimed to develop a fast and accurate approach for predicting the welding distortion in large thin-wall structures, such automotive body structures. The finite element analysis (FEA) was the tool used in this work to study welding plastic deformation. Before finite element (FE) simulations were carried out for this purpose, a proper FE model was formulated and verified with experiments so that it was capable of rendering accurate distortion computation as well as capturing all the data necessary to investigate the plastic deformation. After verified by the experimental results, the FE model was utilized to perform the welding simulations of three types of simple joints including butt-welded plates, Tee joint, and plate with slot weld. The analysis results were extracted and analyzed to study the in-plane shrinkage and plastic behaviors. The plastic strain distributions were examined in combination with the peak temperatures experienced during welding and the material softening at elevated temperatures. The in-plane shrinkage was correlated to the distribution characteristics of plastic strains, and furthermore the relationships between the plastic strains and their influencing factors were established. The engineering approach was developed based on the findings obtained from the study described above. The research issue of central importance in developing the engineering approach was how to introduce the plastic deformation equivalent to the actual one into the FE model. Temperature load was used in this study and then the central issue became formulating the temperature load, namely its distribution including area of application and magnitude. The engineering approach was then used to predict the welding distortions of two automotive body structures. The predicted distortions were compared with the measurements and excellent agreements existed between them.
Chon Tsai (Advisor)
268 p.
Engineering, Mechanical
Computational welding mechanics; Welding structural design; Finite element analysis; Welding distortion; Distortion prediction; Welding process simulation

Recommended Citations

Citations

  • Cheng, W. (2005). In-plane shrinkage strains and their effects on welding distortion in thin-wall structures [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1124049585

    APA Style (7th edition)

  • Cheng, Wentao. In-plane shrinkage strains and their effects on welding distortion in thin-wall structures. 2005. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1124049585.

    MLA Style (8th edition)

  • Cheng, Wentao. "In-plane shrinkage strains and their effects on welding distortion in thin-wall structures." Doctoral dissertation, Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1124049585

    Chicago Manual of Style (17th edition)

osu1124049585
8,103
© 2005, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.