Analyses on Transient Stresses and Deformations of Steel Strips Subjected to Local Heating (Continued Report)

Abstract

In the previous report, thermal stresses and deformation of a steel strip subjected to local heating were analysed by the finite element method, and useful knowledge on temperature, strain and stress distributions was obtained.
In this continued report, the effects of latent heat, the breadth of the strips and external restraint on these distributions were investigated.
The results obtained are as follows.
1) The temperature distribution in the vicinity of melting zone can be evaluated more accurately by considering latent heat.
2) The effects of latent heat on stress distributions as well as deformations of the strips are considerably small.
3) The maximum tensile residual stress occurs near the boundary of heated region, and shows a tendency to increase as the breadth of the strips increases.
4) The angular distortions of the strips can be evaluated simply by using the beam theory provided that an amount of inherent strain in the heated region is estimated properly.
5) Removing end restraints after the completion of thermal cycle, it is possible that a large amount of deflection may occur compared with that in free condition.