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High Throughput Determination of Creep Parameters Using Cantilever Bending: Part II - Primary and Steady-State through Uniaxial Equivalency

Published online by Cambridge University Press:  18 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

The stress and hence strain fields in a cantilever deforming as per power-law creep vary across the length and thickness of the sample, which allow obtaining multiple stress–strain pairs from a single test. Here, a high-throughput method is described to quantify the primary-cum-steady-state creep response of materials by testing a single cantilever sample in bending and mapping strain fields using digital image correlation. The method is based on the existence of stress invariant points in a cantilever, where the value of stress does not change during creep. It is demonstrated that strain evolution throughout primary and steady-state stages at these points is identical to the creep response obtained under uniaxial tests. Furthermore, the gained insights were exploited to obtain various parameters of a power-law type primary-cum-steady-state creep equation by testing only one cantilever sample. The developed method allows obtaining uniaxial creep curves at multiple stresses by testing a single cantilever, thereby reducing the time and number of samples required to understand the creep behavior of a material. The method has been validated by performing bending tests on Al and comparing the results with those of corresponding uniaxial tests.

Keywords

stress invariant locationsbending creepprimary and steady-state creepuniaxial creep parametersalternate creep testing methodologies
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 4 , 28 February 2020 , pp. 362 - 371
Copyright
Copyright © Materials Research Society 2020

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References

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