Tuesday  |  Frick  |  02:20 PM–02:40 PM

#13545, Nondestructive Estimation of Residual Stresses from In-Situ Deformation Measurement and Stress Determination

In this investigation, we study the evolution of both the deformation and the stress in a notched metallic thin sheet subject to tension. The deformation over the sample surface is obtained using the optical technique of Digital Image Correlation (DIC), which maps out the full-field displacement over a two-dimensional (2D) domain. The (nonuniform) stress field associated with the measured deformation is determined using the technique developed by Liu (Journal of Applied Mechanics, 88:071005, 2021), where it was shown that the stresses can be computed based on the measured deformation by solving the equation of equilibrium together with appropriate traction boundary conditions, provided the mechanical response of the deforming material remains isotropic. Thus, detailed knowledge of the constitutive behavior of the deforming solid is not required. We then focus on the situation when the external tensile load is completely removed and some permanent deformation remains within the notched sheet. The stresses associated with such permanent deformation (the residual stress) is estimated. The features of the residual stress field and the feasibility of the technique proposed in Liu (2021) for determining/estimation of residual stresses will be studied and discussed.

Cheng Liu   Los Alamos National Laboratory
Matthew Lewis   Los Alamos National Laboratory
Nathan Miller   Los Alamos National Laboratory
Darby Luscher   Los Alamos National Laboratory
Michael Prime   Los Alamos National Laboratory