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Experimental Results and Discussions
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150 degrees 90 degrees angle of bend bend angle bend decreases bend line bend radius calculated cold-bent plate Coupons curvature Dat's equations degree of springback drilling due to cold-bending gages were applied high-elongation strain gages hole hole-drilling method HY-100 steel plates IIID COMP inner surface kip-in loading magnitude MATERIAL PROPERTIES maximum surface strain measured residual strains measured strains measuring residual stress neutral surface obtained by sectioning percentage of springback plane strain plastic plastic bending plate surface plate thickness Poisson's ratio predicted values present investigation punch radius and bend radius of bend residual strains measured residual stresses due RESIDUAL STRESSES KSI residual stresses obtained results obtained sectioning method shown in Fig shown in Table Springback after Unloading strain gage rosette strain hardening surface residual strains surface residual stresses surface strain due tangential residual stresses tension residual stress test results thick plate THICKNESS OF PLATE welding yield strength yield stress Young's modulus