抄録
The amount of back stress formed in work-hardened IF steel was examined. The stress-strain curves of tension and those of compression tests were obtained by four-bending test, which used two strain gauges glued on the top surfaces to measure the fiber stresses there. Pre-strained bars after tensile deformation of 0.5,1,2,3,4, 10,20,30% strain were prepared, and subjected to the bending test. The result showed that the Bauschinger effect in subsequent compression was almost absent in the specimens prestrained below 4%. However, the effect was developed in specimens prestrained larger than 10% strain.
