Investigation of Residual Stresses in Cold-Formed Steel Sections with Nonlinear Strain-Hardened Material Model
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...The neutral axis generally located in the middle between inner and outer surfaces, in a bending process, can be shifted to the inner surface when the tube corner radius-to-thickness (r/t) ratio decrease.(32,33) The identification of the repositioned neutral axis location in the tube after hydroforming process is essential since it permits to identify the area within the tube under tensile (expansion) and compressive (compressed) stresses....
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...This result is also in a good agreement with the analytical results found by Chinnaraj and Ramasamy.(32,33) In addition, it is clear that the COF affects significantly the values of the residual stresses principally in the corner zone (Figure 11)....
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...This result is also in a good agreement with the analytical results found by Chinnaraj and Ramasamy.32,33 In addition, it is clear that the COF affects significantly the values of the residual stresses principally in the corner zone (Figure 11)....
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