37. coupled thermal-mechanical-contact analysis of hot cracking in laser welded lap joints

Department: Structural Engineering
Research Institute Affiliation: Agile Center for Extreme Events Research (CEER)
Faculty Advisor(s): Jiun-Shyan Chen

Primary Student
Name: Qizhi He
Email: q9he@ucsd.edu
Phone: 310-383-8989
Grad Year: 2017

Student Collaborators
Haoyan Wei, h4wei@ucsd.edu

While laser welding plays an important role in automotive manufacturing, its application to lightweight Al-Mg-Si alloys is still limited due to the hot cracking formation. In the present work, a welding state based thermomechanical finite element model is developed for analysis of the hot cracking susceptibility. In the proposed approach, the phase transitions are presented by introducing a new irreversible melting state variable into the thermal and mechanical contact models. The simulation results of this computational framework reveal that crack initiation location is close to the free edge side of the specimen, which agrees with previous experimental observations. The influences of various processing parameters on the cracking susceptibility, including the boundary constraints and laser beam location have also been identified in this study.

Industry Application Area(s)
Civil/Structural Engineering | Materials

Related Files:

  1. 2017.02GM_QZ_v2.pdf

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