Start | At-A-Glance | Browse by Day | Author Index

GEN-14.4 Characterization of Residual Strain in the Stop Region of a Titanium Laser Weld

Tuesday, June 5, 2012: 9:45 AM
Cyperus 1 (Hilton Chicago/Indian Lakes Resort)
Dr. Thomas Lienert , Los Alamos National Laboratory, Los Alamos , NM
Mr. John O. Milewski , Los Alamos National Laboratory, Los Alamos, NM
Dr. Ching-Fong Chen , Los Alamos National Laboratory, Los Alamos, NM
Mr. William S. Stellwag Jr. , Los Alamos National Laboratory, Los Alamos, NM
Dr. Bjørn Clausen , Los Alamos National Laboratory, Los Alamos, NM
Dr. Donald W. Brown , Los Alamos National Laboratory, Los Alamos, NM
Elastic residual strains were measured along the weld termination region of a laser welded titanium ring using neutron diffraction.  These measurements were compared to calculations obtained from simulation of the residual stress near the weld stop region using SYSWELD ® and converted to strain values. The calculated strains were in general agreement with the measurement results.  Large highly localized regions of axial compressive strain are confirmed to extend beyond the weld stop, while localized regions of tensile axial strain trail the stop region in comparison to regions away from the weld stop.  Tensile hoop strains are largest in magnitude and dominate near to the weld centerline but vary the least rotationally along the stop region. This degree of model validation allows study of regions not easily accessible to neutron diffraction strain measurement.  Further analysis of the simulation results provides insight into the spatial extent of the residual stress response such as the near surface or spatial gradients in regions smaller than the gauge volume of the neutron measurement.
See more of: Session 14 - Residual Stress III
See more of: Online Submissions