Experimental observations of reversible transformation toughening

SCRIPTA MATERIALIA

卷:191

Article

Makkar, J.¹  Young, B.²  Karaman, I²  Baxevanis, T.¹ 

[1] Univ Houston, Dept Mech Engn, Houston, TX 77204 USA

[2] Texas A&M Univ, Dept Mat Sci & Engn, College Stn, TX 77843 USA

关键词: Fracture;    Toughness;    Martensitic phase transformation;    Shape memory alloys;   

DOI  :  10.1016/j.scriptamat.2020.09.018

来源: Elsevier

【 摘 要 】

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. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free