In-situ observation of tensile experiments on austenitic stainless steel by ESPI

Manabu Tominaga; Satoru Toyooka; Hisanori Taniyama; Qing-Chuan Zhang

doi:10.1117/12.427023

8 May 2001 In-situ observation of tensile experiments on austenitic stainless steel by ESPI

Manabu Tominaga, Satoru Toyooka, Hisanori Taniyama, Qing-Chuan Zhang

Proceedings Volume 4416, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001); (2001) https://doi.org/10.1117/12.427023
Event: Optical Engineering for Sensing and Nanotechnology (ICOSN '01), 2001, Yokohama, Japan

Abstract

A dynamic process of tensile experiment of austenitic stainless steel was observed by electronic speckle pattern interferometry (ESPI) which enables us to observe entire process of whole field deformation. In plastic deformation state, localized deformation appeared as concentrated correlation fringes in a narrow band, which run over the specimen repeatedly. Correspondingly, a stress curve took zigzag variation. In microscopic surface observation of fractured samples, martensite were found together with crashed grain. Increase of hardness was also confirmed. It means that strain induced martensitic transformation generates in part in heterogeneous structure of the material. These phenomena vary depending on carbon content and tensile speed. Correspondingly, propagating behavior of the band observed by ESPI, e.g. band propagating speed varies. It suggests that ESPI observation makes it possible to diagnose material degradation under in situ condition.

Citation Download Citation

Manabu Tominaga, Satoru Toyooka, Hisanori Taniyama, and Qing-Chuan Zhang "In-situ observation of tensile experiments on austenitic stainless steel by ESPI", Proc. SPIE 4416, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001), (8 May 2001); https://doi.org/10.1117/12.427023

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