Two-step phase shifting interferometry technique for evaluation of fatigue process zone parameters in notched specimens

Leonid I. Muravsky; Pascal Picart; Arkady B. Kmet'; Taras I. Voronyak; Orest P. Ostash; Ihor V. Stasyshyn

doi:10.1117/12.2236456

28 August 2016 Two-step phase shifting interferometry technique for evaluation of fatigue process zone parameters in notched specimens

Leonid I. Muravsky, Pascal Picart, Arkady B. Kmet', Taras I. Voronyak, Orest P. Ostash, Ihor V. Stasyshyn

Author Affiliations +

Proceedings Volume 9960, Interferometry XVIII; 996011 (2016) https://doi.org/10.1117/12.2236456
Event: SPIE Optical Engineering + Applications, 2016, San Diego, California, United States

Abstract

A new two-step phase shifting interferometry technique for evaluation of a fatigue process zone (FPZ) in notched metal and alloy specimens is proposed. In comparison with well-known destructive and nondestructive methods evaluating FPZ, this technique possesses higher accuracy and performance and allows defining the FPZ size for notched specimens made of metals and alloys with low, moderate or high plasticity. The technique is fulfilled by retrieval of a total surface relief of a studied notched specimen, extraction of surface roughness and waviness phase maps from the retrieved surface relief, calculation of a surface roughness parameter R_a spatial distribution and definition of the FPZ size by using an extracted surface roughness phase map. Obtained experimental results have confirmed assumption that the surface roughness of notched specimens after cyclic loading reaches its maximum values at the FPZ boundary. This boundary is produced as the narrow strip containing pixels possessing the maximum values on the spatial distribution of the roughness parameter Ra near a notch root. The basic distances d* defining the FPZ sizes were measured for notched specimens made of a low-carbon steel and aluminum alloys 2024–Т6 and 7075–T3. Results of the distances d* measurement are very close to respective results obtained with the help of other methods for the FPZ evaluation.

Citation Download Citation

Leonid I. Muravsky, Pascal Picart, Arkady B. Kmet', Taras I. Voronyak, Orest P. Ostash, and Ihor V. Stasyshyn "Two-step phase shifting interferometry technique for evaluation of fatigue process zone parameters in notched specimens", Proc. SPIE 9960, Interferometry XVIII, 996011 (28 August 2016); https://doi.org/10.1117/12.2236456

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available