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Hosford,William F.,전기찬 대한금속재료학회(대한금속학회) 1986 대한금속·재료학회지 Vol.24 No.12
Physical effects resulting from strain-path changes from cold rolling to uniaxial tension were studied on two sheet steels; a aluminum-killed steel and a normalized aluminum-killed steel. Cold rolling caused a unusually large decrease in uniform strain and in total strain to failure in all orientations in subsequent tension. The prestrained sheets showed three stages of deformation; initial rapid work hardening, work softening and low-work hardening stage.
전기찬,Hosford,W. F. 대한금속재료학회(대한금속학회) 1987 대한금속·재료학회지 Vol.25 No.11
Several new test procedures were tried to measure flow behavior of sheet metals under combined stress stales utilizing a normalized aluminum-killed steel which was nearly isotropic. Equibiaxial stress condition was obtained From a through-thickness compression test on a disk-slacked circular cylinder. Plane strain and pure shear conditions were obtained by plane strain compression tests, in which one of in-plane strains or the thickness strain is zero. Experimental Flow stresses of the steel were slightly higher in the equibiaxial loading path, and slightly lower in the plane-strain path than the expected values from the Mises theory. Experimental flow stresses in the pure shear path fitted well with the theoretical values.
전기찬,Hosford, William F. 대한금속재료학회(대한금속학회) 1986 대한금속·재료학회지 Vol.24 No.1
Three sheet steels were uniaxially prestrained and tension tested in 15˚intervals to the prestrain axis In the subsequent tests after prestrains higher than about 7%, the residual uniform strains were very small in orientations beyond 30˚ to the prestrain axis. Total strains to failure also decreased in these noncoaxial orientations but the tendency was not as marked as in the uniform strain. The subsequent flow curves in the noncoaxial directions skewed no sharp yield points. The work-hardening rate was initially very high but decreased rapidly, which resulted in a large decrease in uniform strain.