Abstract
This paper details the development and assessment of a new empirical creep model that belongs to the limited ranks of models reproducing full creep curves. The important features of the model are that it is fully standardised and is universally applicable. By standardising, the user no longer chooses functions but rather fits one set of constants only. Testing it on 7 contrasting materials, reproducing 181 creep curves we demonstrate its universality. New model and Theta Projection curves are compared to one another using an assessment tool developed within this paper.
Highlights
Over the last 50 years, creep modelling has become an area of significant expertise as components are being designed with more precision for increasingly extreme environments
By removing the need for a user to choose functions it is hoped a standardised approach to modelling creep curves is possible
Taking the raw creep dataset for a material, the normalised activation energy is obtained from the gradient of ln(tf) vs. 1/T for σ/σN = constant
Summary
Over the last 50 years, creep modelling has become an area of significant expertise as components are being designed with more precision for increasingly extreme environments. Engineers and scientists have endeavored to understand, describe and predict the phenomenon of creep focusing on the rupture time and minimum strain rate of a material [1] Predicting these two material properties is no longer sufficient as components are being designed to operate under specific constraints beyond these two points on the creep curve [2]. Few models exist that do this effectively, with the most well-known being Theta Projection [3], Wilshire Equations [4,5] and Uniaxial Creep Lifing [6] These creep curve models at some point in their implementation require a user to define functions from data trends [1]. By removing the need for a user to choose functions it is hoped a standardised approach to modelling creep curves is possible
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