Papers by Keyword: Bending Curvature

Abstract: The flexion solicitation induces in a bent beam a non-uniform stress field. The problem becomes more challenging when the material has a complex behavior, because the material may have different response from one area to another according to the local stress state. In the present work, it is considered, a six parameters rheological model to simulate the behavior of an elastoviscoplastic material. The mathematical law of the behavior is established; thereafter one must determine the beam bending curvature which is an essential and capital parameter for the flexion. Indeed, the bending curvature allows knowing the stress field in the beam. In viscoelastic step, the curvature is obtained by an analytical integration. While in the elastoviscoplastic step, two zones of different behaviors coexist which are namely viscoelastic and elastoviscoplastic, then a numerical integration is required. The numerical integration is achieved, and then the stress field is obtained through the beam and over the time.

Abstract: When rolled heavy rail is on the cooling bed for natural cooling, the heat transfer coefficient has important effect on the bending and section sizes of cooled heavy rail. In the paper, the heat-stress couple module of ANSYS software is adopted to carry on numerical simulation on the cooling process of 60kg/m U75V heavy rail, and we obtain the change rule that heat transfer coefficient has effect on bending curvature and section sizes of cooled heavy rail. This study is of great reference value on cooling bed design and the formulation of cooling technological parameters for high speed heavy rail.

Abstract: Using finite element method (FEM), the results of bending conditions of the intermediate plate at the bending rolls of a coilbox between the roughing and finishing stands in a hot strip mill were obtained. The intermediate plate was coiled in a coilbox, which effectively overcame the problem of temperature drop by reducing surface area exposed to radiant heat loss during the waiting period. Different states of the plate in the coilbox were simulated by FEM, and the mathematical model of the bending rolls was established, which was in accord with the simulation results that the plate was coiled. As the bending shape of the front end of the intermediate plate is crucial to coiling process, the curvatures of the plate were predicted through FEM. In addition, the roll diameter and arrangement affect the optimum curvature, thus the parameters for bending rolls were determined without many adjustments. The developed bending model has been applied to actual coilbox in plant.