Development of Non linear Elastic Plastic Theory and Isochronous curve for Creep-buckling

Abstract

The Development of the Non Linear Elastic plastic theory is the Need of the Worldfor the Materials which is Loaded in Creep Range and Buckling.Prime Focus is on the Coke Drum Skirt Material Failure. CokeDrum is Manufacturein Larson and Toubro Ltd, Hazira Works, Surat. this Drum is Used For the Cockingand Decoking of the Coal.Drum is the Rested on Skirt and Welded with toricone Shellsupport.So Due to Long Time Temprature and Pressure Variation and also Continu-ously working ,Skirt Material is subjected to Creep Buckling. This Report Comprisesthe Work Related to the Development of Isochronous Curve of the Skirt Material(1.25Cr-0.5Mo Alloy Steel) and Elastic Plastic Theory. similarly it can be developedfor other material also. by nding Isochronous curve We can found out MaximumAllowable Buckling Stress for the Material.Also by knowing Stress and Strain Values for particular Temperature and Given Load-ing Remaining life of the Component can be found out.After developing the isochronous curve we can know the allowable buckling Strengthof material,by calculating Tangent and Secant Modules at that stress by calculatingproof stress. Finally we can found out allowable compressive stress developed in theSkirt Material so that Failure of the Skirt can be avoided.These curves are particularly useful in evaluating in Creep Buckling potential ofcomponent.