Investigation of Stresses in U-Shaped Metal Bellow Using EJMA Standards

Metal Bellows finds wide application in expansion joints, which are used in aerospace, chemical plants, power system, heat exchangers, automotive vehicle parts, piping system, petrochemical plant, refineries, etc. During service they are subjected to various stresses and exposed to different environments, which leads to failure. Hence there is a need for proper design of metal bellow as per the application. The main objective of the paper is to evaluate the stresses generated in the metal bellow and the cycle life working at different working pressures. In this paper, the stresses are calculated using Expansion Joint Manufacturing Association (EJMA) standards and compared with the results obtained using ANYS software for two different materials namely Inconel ۶۲۵ and Inconel ۷۱۸ for the pressure values ranging from ۲۰ to ۴۰ bar. 

Keywords:

EJMA , Expansion joints , Metal bellow