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Research Papers: Design and Analysis

A Novel and Simple Approach for Predicting Creep Life Based on Tertiary Creep Behavior

[+] Author and Article Information
Khosrow Zarrabi

School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, NSW 2052, Australiak.zarrabi@unsw.edu.au

Lawrence Ng

School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, NSW 2052, Australialawrence̱ng̱ky@yahoo.com.au

J. Pressure Vessel Technol 130(4), 041201 (Aug 20, 2008) (10 pages) doi:10.1115/1.2967879 History: Received March 29, 2006; Revised June 11, 2007; Published August 20, 2008

The creep of materials is a research topic of major significance in the life assessment and design of many modern engineering components of advanced technology such as power generation plant, chemical plant, gas turbines, jet engines, spacecrafts, and components made of plastics and polymers. To predict the creep life of such components, one necessary ingredient is a creep damage model. The current creep damage models are either too cumbersome to be readily employed and/or not sufficiently accurate for practical applications. This paper describes a new multiaxial creep damage model that alleviates the major shortcomings of the existing models. Yet it is relatively simple and accurate and is readily applicable to industrial cases.

Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

A schematic presentation of the average total strain energy in damaged zone(s) versus time

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Figure 3

Uniaxial rupture data of the thick tube

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Figure 4

Hoop stress versus radial distance at various time points for the thick tube

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Figure 5

von Mises equivalent stress versus radial distance at various time points for the thick tube

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Figure 6

Average internal energy versus time for the thick tube

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Figure 8

Uniaxial rupture data of the thin tube

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Figure 9

Hoop stress versus radial distance at various time points for the thin tube

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Figure 10

von Mises equivalent stress versus radial distance at various time points for the thin tube

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Figure 11

Average internal energy versus time for the thin tube

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Figure 12

Modified Bridgman II notched bar

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Figure 13

Axial stress versus radial distance at various time points for the notched bar

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Figure 14

von Mises equivalent stress versus radial distance at various time points for the notched bar

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Figure 15

Average internal energy versus time for the modified Bridgman II notched bar

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