Fatigue crack growth and life prediction under mixed-mode loading

Sajith, S.; Murthy, K.S.R.K.; Robi, P. S.

doi:10.1063/1.5029644

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…A more detailed model, the Modified Forman-Newman, can describe the three regions of crack growth by incorporating the threshold and fracture toughness, K c , as depicted in Equation (6).…”

Section: Crack Growth Modelsmentioning

confidence: 99%

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Experimental and Numerical Evaluation of Equivalent Stress Intensity Factor Models under Mixed-Mode (I+II) Loading

Gómez-Gamboa,

Díaz-Rodríguez,

Mantilla-Villalobos

et al. 2024

Infrastructures

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This study determines the equivalent stress intensity factor (SIF) model that best fits the experimental behavior of low-carbon steel under mixed modes (I and II). The study assessed Tanaka, Richard, and Pook’s equivalent SIF models. The theoretical values used for comparison correspond to the 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. The 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. This study sheds light on the accuracy and limitations of different equivalent SIF models, providing valuable insights for structural integrity assessments in engineering applications.

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“…A more detailed model, the Modified Forman-Newman, can describe the three regions of crack growth by incorporating the threshold and fracture toughness, K c , as depicted in Equation (6).…”

Section: Crack Growth Modelsmentioning

confidence: 99%

“…Consequently, it is necessary to identify the K eq models that best account for the combination loading modes [5]. Therefore, when more than one loading is present, the choice of K eq impacts the crack growth rate [6]. Previous studies [7,8] suggest a significant decrease in the toughness of metals when mixed-mode failures occur.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Evaluation of Equivalent Stress Intensity Factor Models under Mixed-Mode (I+II) Loading

Gómez-Gamboa,

Díaz-Rodríguez,

Mantilla-Villalobos

et al. 2024

Infrastructures

View full text Add to dashboard Cite

show abstract

“…A more detailed model, the modified Forman-Newman, can describe the three regions of crack growth by incorporating the threshold and fracture toughness, Kc, as depicted in Equation (6).…”

Section: Crack Growth Modelsmentioning

confidence: 99%

“…So, it is necessary to identify the Keq models that best account for the combination loading modes [5]. Therefore, when more than one loading is present, the choice of Keq impacts the crack growth rate [6]. Based on previous studies [7], [8] suggesting a significant decrease in the toughness of metals when mixed mode failures occur, this paper tests three Keq models using two different numerical approaches in combination with three fatigue crack growth rules.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Evaluation of Equivalent Stress Intensity Factor Models under Mixed-Mode (I+II) Loading

Gómez-Gamboa,

Díaz-Rodríguez,

Mantilla-Villalobos

et al. 2024

Preprint

View full text Add to dashboard Cite

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.

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Accurate Estimation of Mixed-Mode Stress Intensity Factors Using Crack Flank Displacements

Sajith

Murthy

Robi

2020

Lecture Notes in Mechanical Engineering

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Fatigue crack growth and life prediction under mixed-mode loading

Cited by 5 publications

References 8 publications

Experimental and Numerical Evaluation of Equivalent Stress Intensity Factor Models under Mixed-Mode (I+II) Loading

Experimental and Numerical Evaluation of Equivalent Stress Intensity Factor Models under Mixed-Mode (I+II) Loading

Experimental and Numerical Evaluation of Equivalent Stress Intensity Factor Models under Mixed-Mode (I+II) Loading

Accurate Estimation of Mixed-Mode Stress Intensity Factors Using Crack Flank Displacements

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