Development of Finite Element Forulations for High-Fidelity Polycrystals and Damage Avoidance in Friction Stir Welding
Abstract
The research funded under this grant had two primary objectives. The first objective focused on advancing the technology of friction stir welding (FSW) in shipbuilding. We developed finite element based simulation methods that can help identify those conditions conducive to defect development in the welded joint. Our objective was to identify processing windows that avoid conditions that promote macroscopic defects called "wormholes." The second objective focused on advancing micromechanical models for plastic deformation of structural alloys used in ship building. We are addressing two aspects of the mechanical behavior: the stress distribution as the metal yields under different states of stress and the yield asymmetry that develops between tension and compression following plastic deformation. As part of this objective, we developed neutron diffraction experiments with in situ biaxial loading that permit us to better motivate and critique the micromechanical models.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 26, 2010
- Accession Number
- ADA524918
Entities
People
- Paul R. Dawson
Organizations
- Sibley School of Mechanical and Aerospace Engineering