냉간 압연된 전기강판의 응력-변형률 곡선 모델

초록

A constitutive equation of the electrical steel strip used for a raw material of transformer is proposed. The stress-strain behavior of electrical steel strip is quite different from that of common carbon steel and/or alloy steel. A series of tensile tests were performed with the specimens made from cold rolled strip. Several thicknesses of the strip were produced by a two-high (with upper and lower rolls) cold rolling pilot mill as reduction ratio increases from 10% to 90%. Its initial steel are examined through rolling direction. Ramberg-Osgood model and the proposed equation are combined to describe the total behavior of stress-strain including instability region. The stres-strain curves calculated from the present constitutive equation are compared with those from experimentaly obtained at each test condition of reduction ratios of specimen. Results show that the predicted stres-strain curves are in overall in a good agreement with measured ones.

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