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High Throughput Determination of Creep Parameters Using Cantilever Bending: Part I - Steady-State

Published online by Cambridge University Press:  19 February 2020

Syed Idrees Afzal Jalali ,
Praveen Kumar  and
Vikram Jayaram
Syed Idrees Afzal Jalali*
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
Praveen Kumar*
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
Vikram Jayaram*
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
*
a)Address all correspondence to these authors. e-mail: ali.idrees2@gmail.com
b)e-mail: praveenk@iisc.ac.in
c)e-mail: qjayaram@iisc.ac.in
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Abstract

Variation of stress across the length and thickness of a cantilever during creep allows obtaining multiple pairs of strain rates and stress under steady-state condition. This work applies digital image correlation (DIC) and conjugate analytical models to obtain several such “strain rate–stress” pairs during steady-state creep by testing a single cantilever at a constant applied load. Furthermore, these strain rate–stress pairs are used to accurately determine the stress exponent of the material (e.g., Al and Pb). In addition, an empirical observation of plotting strain rate as a function of stress at fixed strain during primary creep for estimating stress exponent is extended to bending creep, wherein strain rates of the points in the cantilever lying on an iso-strain contour were plotted against the moment at the point to determine stress exponent. This study, thereby, proves that the “bending creep–DIC” combination is a high throughput test methodology for studying steady-state creep.

Keywords

bending creepdigital image correlationhigh throughput testingsteady-state creepstress exponent

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Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 4 , 28 February 2020 , pp. 353 - 361
Copyright
Copyright © Materials Research Society 2020

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