Analytical Investigations on Stress Relaxation at Elevated Temperature

ISBN-13: 9786139987115 / Angielski / Miękka / 2019 / 184 str.

Suneel Donthamsetty

Opis

Stress relaxation is a phenomenon which occurs for components subjected to stress and temperature and natural creep is some how arrested. That the natural creep gets arrested due to prevailing constraints is a common experience and stress relaxation is almost always present. This subject of stress relaxation which is of concern in design of high temperature components is the theme of this research. Relaxation is studied next using these creep laws and a relaxation model. Five different relaxation models are considered and uniaxial (pure) relaxation is studied. A typical bolt material (x 22 crMo V 121) is used for analysis. The experimentally observed relaxation is used to evaluate various relaxation models. Larsen Miller parameter (LMP) which is quite commonly used in creep calculations is advantageously used to evaluate self-consistency of various creep laws and the relaxations derived there from. Practical cases of stress relaxation like relaxation under stress gradient and temperature gradient & pre tensioned bolt are studied. Some programs in the form of spread-sheet, Fortran, and ANSYS macros are also developed.

O autorze

Donthamsetty, Suneel
Prof.D.Suneel, a distinguished academician and a seasoned Mechanical Engg Professor is the Head of the Mechanical Department and Dean Academics in Narasaraopeta Engineering College, Narasaraopet. He received his Masters Degree from Sri Venkateswara University, Tirupati & Doctorate Degree from Andhra University, Visakhapatnam, India in the year 2010