Abstract
The deformation behavior of cold-rolled IF steel sheet under biaxial tension was investigated for a strain range from initial yielding to fracture. The test material was bent and laser welded to fabricate a tubular specimen. Multiaxial tube expansion tests were performed using a servo-controlled tension-internal pressure testing machine. Many linear stress paths in the first quadrant of stress space were applied to the tubular specimens to measure the counters of plastic work and the directions of the plastic strain rates. It was found the shapes of the work counters changed with an increase in ε^P_0 and the Yld2000-2d yield function could reproduce the differential work hardening behavior (DWH) of the test material by changing the material parameters and exponent as functions of ε^P_0. Finite element analysis of hydraulic bulge forming has verified the effectiveness of proposed DWH model based on Yld2000-2d yield function for improving the accuracy of the FEA.
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