Elsevier

Scripta Materialia

Volume 191, 15 January 2021, Pages 81-85
Scripta Materialia

Experimental observations of “reversible” transformation toughening

https://doi.org/10.1016/j.scriptamat.2020.09.018Get rights and content

Abstract

Materials with the propensity to undergo irreversible deformation display an increasing resistance to progressive crack advance, i.e., stable crack growth. A one-parameter description of stable crack growth by a fracture toughness vs. crack advance (resistance) curve is possible under specific conditions. Here, experimental observations are reported to (i) demonstrate that the toughness enhancement due to crack advance in hysteretic materials may be “reversed” by partial unloading, which has implications on the evaluation of the resistance curve and its validity conditions, and (ii) provide an experimental verification of the theoretical insight into the mechanics of stable crack growth.

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Declaration of Competing Interest

Authors declare that they have no conflict of interest.

Acknowledgments

This study was supported by the US Air Force Office of Scientific Research under grant no. FA9550-15-1-0287, the National Science Foundation under grants no. CMMI-1917441 and CMMI-1917367, and by NASA-ULI under grant no. NNX17AJ96A.

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    These authors have contributed equally to this letter.

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