Modeling and validation of residual stress distribution in an HSLA-100 disk [electronic resource].
- Washington, D.C. : United States. Dept. of Defense, 1995.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- 6 pages : digital, PDF file
- Additional Creators:
- Oak Ridge National Laboratory
United States. Department of Defense
United States. Department of Energy. Office of Scientific and Technical Information
- The residual stress distribution in a GTA spot we 100 steel disk was analyzed using thermomechanically uncoupled and semi-coupled finite element (FE) formulations and measured with the neutron diffraction technique. The computations used temperature-dependent the and mechanical properties of the base metal. The thermal analysis was based on the heat conduction formulation with the Gaussian heat input from the arc. The semi-coupled approach is an effective alternative to the fully coupled approach in which the incompatibility in the thermal and mechanical time increments often leads to numerical convergence difficulties. Convergence was achieved in the semi-coupled approach where a larger time increment for temperature calculation was automatically divided into some sub-intervals for the thermal stress calculation. The temperature, deformation configurations, and state variables were updated at the end of the temperature increment. The predictions from the FE models are in very good agreement with the neutron measurement results in the far heat-affected zone (HAZ) and in the base metal. Both models over-predicted the residual stress field in the fusion zone and near HAZ as measured by the neutron diffraction method. The discrepancy could be attributed to the changes in microstructures and material properties in the HAZ and fusion zone due to phase transformations during the welding thermal cycle. The formation of cracks in the fusion zone is another factor that possibly contributes to the lower measured residual stress values.
- Published through SciTech Connect.
4. international conference on trends in welding research, Gatlinburg, TN (United States), 5-9 Jun 1995.
Fields, R.J.; Blackburn, J.M.; Feng, Z.; Zacharia, T.; Zhu, Y.Y.; Brand, P.C.; Prask, H.J.
- Funding Information:
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