Volume 04,Issue 04

Creep Analysis of the Autofrettage and Non- autofrettage Inconel 100 Super Alloy Thick-walled Spherical Pressure Vessel

Authors

Nabard Habibi, Danial Wahdatpanah

Abstract
As it is clear, one of the most challenging issues in the beams and spherical vessels are the creeps, which can have significant effects in temperature-dependent tests. This parameter is highly dependent on temperature and stress factors. It can be illustrated that we would use an analytical method and linearizing general creep equation namely Norton's law to extract relative constants (n, B) according to results and getting creep amount in a spherical pressure vessel in a non-autofrettage and then in an autofrettage mode by putting mentioned constants in non autofrettage and autofrettage stresses formula. It should be noted that the stress formulas in autofrettage mode are obtained by the linearization stress-strain curve in both elastic and plastic sections. The effects of autofrettage process in the entire spherical pressure vessel are observed at various pressures and temperatures, which can be seen in the following article. It can be concluded that applying the autofrettage process in the super-alloyed nickel thick-walled spherical vessel, reduces the creep amount by at least 10 times in the internal radius and 10000 times in the external radius of the vessel. By comparing creep values, we can observe that the autofrettage of spherical vessels is a very practical process in the prevention and immunization of thick-walled spherical vessels so that it can control or eliminate destructive actions such as creep.

Keyword: Spherical vessel, Creep, Critical Pressure, Autofrettage, Stress-strain.

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