Islam Md Nurul, Arai Yoshio, Araki Wakako
Department of Mechanical Engineering, Rajshahi University of Engineering and Technology, Rajshahi 6204, Bangladesh.
Department of Mechanical Engineering, Saitama University, Japan.
Ultrasonics. 2015 Feb;56:354-60. doi: 10.1016/j.ultras.2014.09.001. Epub 2014 Sep 17.
The present study proposes the use of ultrasonic back-reflected waves for evaluating low cycle fatigue crack growth from persistent slip bands (PSBs) of stainless steel under block loading. Fatigue under high-low block loading changes the back-reflected intensity of the ultrasonic wave that emanates from the surface. Measuring the change in ultrasonic intensity can predict the start of crack growth with reasonable accuracy. The present study also proposes a modified constant cumulative plastic strain method and a PSB damage evolution model to predict the onset of crack growth under block loads.
