A Method for the Evaluation of Crack Tip Opening Loads Based on Strip Yield Modeling of a Propagating Crack
Date
2025
Authors
Khanna, A.
Vidler, J.
Hughes, J.
Ng, C.
Kotousov, A.
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Advisors
Journal Title
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Volume Title
Type:
Journal article
Citation
Fatigue & Fracture of Engineering Materials & Structures (FFEMS), 2025; 48(8):3338-3352
Statement of Responsibility
Aditya Khanna, James Vidler, James Hughes, Ching Tai Ng, Andrei Kotousov
Conference Name
Abstract
Based on the strip yield model for propagating cracks, the current paper proposes a new method for the evaluation of crack tip opening loads. It is based on the theoretical analysis of shapes of the compliance offset curves for various applied stress levels and R ratios, which indicates that the inflection point of the curve is a good approximation of the initiation of the crack tip opening. The method avoids uncertainties and drawbacks associated with the selection of empirical thresholds or criteria to identify the value of the opening load, which is often utilized to calculate the effective stress intensity factor range or fatigue crack driving force. Careful experimental studies also confirm the ability of this proposed method to negate the R ratio effect on fatigue crack growth rates for a wide range of loading conditions.
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Dissertation Note
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© 2025 The Author(s). Fatigue & Fracture of Engineering Materials & Structures published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.