Analysis of Residual Stress in Rolled H-beam

Abstract

To analyze residual stress in rolled H-beams, a numerical method for the prediction of temperature and thermal stress has been developed by taking phase transformation into account. Temperature during cooling and residual stress calculated by the present method agree well with the measured ones.
The infulence of finishing temperature and sectional size on residual stress is investigated by using the method. The results obtained are as follows;
(1) The larger the thickness ratio of flange to web (tf/tw) is, the higher the stress is.
(2) The larger the difference in finishing temperature between web and flange (Tfo-Two) is, the higher the stress is.
(3) The larger the ratio of sectional area of flange to web (Sf/Sw) is, the lower the tensile stress in flange is and the larger the compressive in web is.
(4) The smaller the amount of non-transformed phase (austenitc amount) in web is and the larger the amount in flange is at finishing rolling, the higher the stress is.
(5) The larger the compressive stress in web is and the larger the ratio of inner width to thickness in web (Bw/tw) is, the more frequently the web buckling occurs.