Gómez-Gamboa, E.; Díaz-Rodríguez, J.G.; Mantilla-Villalobos, J.A.; Bohórquez-Becerra, O.R.; Martínez, M. del J. Experimental and Numerical Evaluation of Equivalent Stress Intensity Factor Models under Mixed-Mode (I+II) Loading. Infrastructures 2024, 9, 45, doi:10.3390/infrastructures9030045.
Gómez-Gamboa, E.; Díaz-Rodríguez, J.G.; Mantilla-Villalobos, J.A.; Bohórquez-Becerra, O.R.; Martínez, M. del J. Experimental and Numerical Evaluation of Equivalent Stress Intensity Factor Models under Mixed-Mode (I+II) Loading. Infrastructures 2024, 9, 45, doi:10.3390/infrastructures9030045.
Gómez-Gamboa, E.; Díaz-Rodríguez, J.G.; Mantilla-Villalobos, J.A.; Bohórquez-Becerra, O.R.; Martínez, M. del J. Experimental and Numerical Evaluation of Equivalent Stress Intensity Factor Models under Mixed-Mode (I+II) Loading. Infrastructures 2024, 9, 45, doi:10.3390/infrastructures9030045.
Gómez-Gamboa, E.; Díaz-Rodríguez, J.G.; Mantilla-Villalobos, J.A.; Bohórquez-Becerra, O.R.; Martínez, M. del J. Experimental and Numerical Evaluation of Equivalent Stress Intensity Factor Models under Mixed-Mode (I+II) Loading. Infrastructures 2024, 9, 45, doi:10.3390/infrastructures9030045.
Abstract
This study determines the equivalent stress intensity factor (SIF) model that best fits the experimental behavior of low-carbon steel under mixed mode (I and II). The study assessed Tanaka, Richard, and Pook's equivalent SIF models. The theoretical values used for comparison correspond to experimental results in a modified C(T) geometry by machining a hole ahead of the crack tip subjected to fatigue loads with a load ratio of R = 0.1. The comparison involved the SIF for six experimental points and the values computed through the numerical simulation. The Paris, Klesnil, and modified Forman-Newman crack growth models were used with each equivalent SIF to analyze the prediction in the estimated number of cycles. The Klesnil model showed the closest prediction since the error between the calculated and experimentally recorded number of cycles is the lowest. However, the material behavior reflects a reduced crack propagation rate attributed to plasticity in the crack tip. Results suggest that Asaro equivalent SIF conservatively estimates the element lifespan with increasing errors from 2.3% at the start of growth to 27 % at the end of the calculation.
Keywords
Equivalent Stress Intensity factor; Low-carbon steel; Mixed Mode I/II; Finite element method (FEM); Boundary element method
Subject
Engineering, Mechanical Engineering
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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