A model for creep life prediction of thin tube using strain energy density as a function of stress triaxiality under quasi-static loading employing elastic-creep & elastic-plastic-creep deformation

doi:10.1007/s11465-013-0257-7

Front Mech Eng

2013, Vol. 8

Issue (2) : 181-186 https://doi.org/10.1007/s11465-013-0257-7

RESEARCH ARTICLE

A model for creep life prediction of thin tube using strain energy density as a function of stress triaxiality under quasi-static loading employing elastic-creep & elastic-plastic-creep deformation

Tahir MAHMOOD^1,2(

), Sangarapillai KANAPATHIPILLAI¹, Mahiuddin CHOWDHURY¹

1. School of Mechanical and Manufacturing Engineering, The University of New South Wales (UNSW), Sydney, NSW 2052, Australia; 2. L&A Pressure Welding Pty Ltd., Sydney, NSW 2212, Australia

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Abstract

This paper demonstrates the application of a new multiaxial creep damage model developed by authors using stress traixiality to predict the failure time of a component made of 0.5%Cr-0.5%Mo-0.25%V low alloy steel. The model employs strain energy density and assumes that the uniaxial strain energy density of a component can be easily calculated and can be converted to multi-axial strain energy density by multiplying it to a function of stress trixiality which is a ratio of mean stress to equivalent stress. For comparison, an elastic-creep and elastic-plastic-creep finite element analysis (FEA) is performed to get multi-axial strain energy density of the component which is compared with the calculated strain energy density for both cases. The verification and application of the model are demonstrated by applying it to thin tube for which the experimental data are available. The predicted failure times by the model are compared with the experimental results. The results show that the proposed model is capable of predicting failure times of the component made of the above-mentioned material with an accuracy of 4.0%.

Keywords elastic-creep elastic-plastic-creep stress triaxiality life prediction pressure vessels finite element analysis (FEA)

Corresponding Author(s): MAHMOOD Tahir,Email:tahir.mahmood@student.unsw.edu.au

Issue Date: 05 June 2013

Cite this article:

Mahiuddin CHOWDHURY,Tahir MAHMOOD,Sangarapillai KANAPATHIPILLAI. A model for creep life prediction of thin tube using strain energy density as a function of stress triaxiality under quasi-static loading employing elastic-creep & elastic-plastic-creep deformation[J]. Front Mech Eng, 2013, 8(2): 181-186.

URL:

https://academic.hep.com.cn/fme/EN/10.1007/s11465-013-0257-7
https://academic.hep.com.cn/fme/EN/Y2013/V8/I2/181

Fig.1 Axisymmetric finite element model of the thin-walled cylinder

Fig.2 Uniaxial stress-strain curve of 0.5%Cr-0.5%Mo-0.25%V steel at 565°C []

Fig.3 Hoop stress versus radial distance at various time points computed using an elastic-creep analysis

Fig.4 Von Mises equivalent stress versus radial distance at various time points computed using an elastic-creep analysis

Fig.5 Hoop stress versus radial distance at various time points computed using an elastic-plastic-creep analysis

Fig.6 Von Mises equivalent stress versus radial distance at various time points computed using an elastic-plastic-creep analysis

Fig.7 Comparison of triaxiality factor, uniaxial and multi-axial strain energy density for elastic-creep analysis

Fig.8 Comparison of triaxiality factor, uniaxial and multi-axial strain energy density for elastic-plastic-creep analysis

Tab.1 Comparison of the life of the vessel using various models

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