
Nondestructive Evaluation of Fracture Toughness in 4130 Steel Using Nonlinear Ultrasonic Testing
The knowledge of ‘plane strain fracture toughness’ (KIC) is essential to the operational safety of fracture-critical systems. However, it is not yet possible to quantify KIC in-service due to the destructive nature of KIC testing. Here, we investigate nonlinear ultrasonic testing (UT) as a nondestructive alternative. We hypothesize a correlation between the nonlinear ultrasonic parameters and KIC of a material due to their mutual dependence on materials’ microstructure. Using second harmonic generation, both surface and bulk wave modes are used to estimate the classical nonlinearity parameter (β) for tempered 4130 steel samples. We also report wave velocity and exponent, a new parameter describing the relationship between the second and fundamental harmonic amplitudes. Corresponding coupons are tested for their KIC characteristics using Charpy V-Notch (CVN) testing, providing a novel direct comparison between destructive and nondestructive tests. Results of nonlinear bulk wave testing indicate a monotonic relation between β and CVN absorbed energy values. The surface wave test results show a different non-monotonic trend. Bulk wave speed and exponent show no correlations with absorbed energy, while surface wave speed and exponent show similar relations. The differences between bulk and surface wave test results are attributed to sample heterogeneity and different wave structures of the two wave modes. Our findings demonstrate the potential of nonlinear UT for in-situ KIC estimation.
Files
Penn State Only
Files are only accessible to users logged-in with a Penn State Access ID.
Metadata
Work Title | Nondestructive Evaluation of Fracture Toughness in 4130 Steel Using Nonlinear Ultrasonic Testing |
---|---|
Access | |
Creators |
|
Keyword |
|
License | In Copyright (Rights Reserved) |
Work Type | Article |
Publisher |
|
Publication Date | January 22, 2022 |
Subject |
|
Language |
|
Publisher Identifier (DOI) |
|
Deposited | March 29, 2023 |
Versions
Analytics
Collections
This resource is currently not in any collection.