Closure to “Discussion of â€کMechanics of Confined Thin Walled Cylinders Subjected to External Pressure,’†(Vasilikis, D., and Karamanos, S., 2014, Appl. Mech. Rev., 66(1), p. 010801)
Abstract
In the course of our study, we examined several parameters that affect buckling behavior of confined thinwalled cylindrical shells. Nevertheless, a few additional parameters are stated by Prof. Gresnigt, namely residual stresses, Bauschinger effect, and heat treatment that may influence the mechanical properties. Residual stresses and the Bauschinger effect are mainly related to the manufacturing process. For largediameter, thinwalled cylinders (D/t > 100), the most popular manufacturing method is spiral welding of a steel coil. Unfortunately, there exists little information on the residual stresses of such pipes. In the course of a European research program, the authors are currently working on the finite element simulation of spiralwelding pipemanufacturing process to determine residual stresses, including the effects of decoiling. Furthermore, residual stress measurements are also performed for comparison purposes. By completion of this research, information on the distribution of residual stresses will be available and appropriate stress distribution can be considered as the initial stress state for external pressure analysis under confined conditions.