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Investigation of Residual Stresses in Cold-Formed Steel Sections with Nonlinear Strain-Hardened Material Model
Journal Article
05-11-03-0022
ISSN: 1946-3979, e-ISSN: 1946-3987
Sector:
Topic:
Citation:
Chinnaraj, K., Sathya Prasad, M., Lakshmana Rao, C., and Ramasamy, P., "Investigation of Residual Stresses in Cold-Formed Steel Sections with Nonlinear Strain-Hardened Material Model," SAE Int. J. Mater. Manf. 11(3):229-240, 2018, https://doi.org/10.4271/05-11-03-0022.
Language:
English
Abstract:
In this article, forming residual stresses in cold-formed small-radius corner
sections are analytically predicted with the consideration of the shift in the
neutral axis and the nonlinear strain-hardened material model. The predicted
forming stress results in the transverse direction show a trend of increased
compressive residual stress in the outer surface and reduced tensile residual
stress in the inner surface, as the corner radius-to-thickness ratio increases
in small-radius bends. In the longitudinal direction, there is no significant
change in the residual stress values observed in the inner and outer surfaces
with respect to an increase in corner radius-to-thickness ratios. But a
considerable decrease in compressive residual stress and an increase in tensile
stress values are observed in the midsection areas, with an increase in the
corner radius-to-thickness ratio. It is observed that the analytical peak
compressive residual stress values are always higher than the experimental
results. Also, the through-thickness residual stress from the numerical model is
in close agreement with the analytical results. The magnitude of the maximum
compressive stress in the inner half thickness is observed to be more than the
magnitude of the maximum tensile stress in the outer half thickness of the
corner section. The shift in the neutral axis towards the inner corner surface
is much severe for lower corner radius-to-thickness ratio sections. The new
approach provides a more accurate definition of initial conditions for further
nonlinear structural behavior analysis of cold-formed structures.