Effect of plasticity on the measurement of residual stresses using ultrasound technique

Torkaman, R.; Mahmoudi, A. H.; Ahmadi-Najafabadi, M.; Karbasian, A.

Abstract

Residual stresses can have detrimental effect on the life cycle of engineering components. They can
also alter the accuracy of the fatigue life prediction models. Therefore, it is important to measure such
stresses with accuracy. One of the issues with the destructive and semi-destructive methods of measuring
residual stresses is the damage they cause in components. In the non-destructive ultrasonic method, not
only does the piece remain intact, but it is also capable of measuring residual stresses even if there is no
portability. There are different waves in the ultrasonic method for measuring residual stresses. In this
study, longitudinal critically refracted (LCR) waves were used owing to their higher sensitivity, larger
area they scan, and lower sensitivity to texture effect, which shows the preference of LCR waves to other
waves. The purpose of this study was to investigate the effect of plasticity on the measurement of residual
stresses by the ultrasonic method. With this end in view, three stainless steel disks were quenched at
temperatures of 300 °C, 500 °C and 700 °C to induce different levels of residual stresses and
subsequently different levels of plasticity. The properties of the piece were required for the numerical
simulations and were obtained using the standard tensile test. The tensile test components were extracted
from the initial sheet to measure the yield stress and modulus of elasticity. In order to measure the
coefficient of acoustoelasticity, the tensile test specimens were applied to different stresses and the wave
flight time was recorded; subsequently, using the slope of yield stress and the corresponding equations,
the coefficient of acoustoelasticity was obtained for stainless steel 316L. Residual stresses were
experimentally measured using the ultrasonic and center-hole drilling methods and the results were
compared with those obtained from numerical analyses. Eventually, the results from center-hole drilling,
ultrasonic method, and numerical simulation were compared and discussed. The measured residual
stresses by the ultrasonic method illustrated a good compatibility with the center-hole drilling results in
different disks and with three different quenching temperatures at 300°C, 500°C and 700°C.

• Journal Article Type: Article
• Acceptance Date: Aug 5, 2023
• Online Publication Date: Jul 31, 2023
• Publication Date: Jul 31, 2023
• Deposit Date: Jan 2, 2025
• Publicly Available Date: Mar 18, 2025
• Journal: Journal of Design Against Fatigue
• Electronic ISSN: 2976-940X
• Publisher: Minerva ASET
• Peer Reviewed: Peer Reviewed
• Volume: 1
• Issue: 2
• Pages: 35-42
• Public URL: https://uwe-repository.worktribe.com/output/12896784
• Publisher URL: https://minerva-aset.com/articles-issues/volume-2/