S-N Curve Characterisation for Composite Materials and Prediction of Remaining Fatigue Life Using Damage Function

Kim, Ho Sung; Huang, Saijie

doi:10.3390/jcs5030076

Cited by 5 publications

(7 citation statements)

References 13 publications

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“…Kim and Huang [8] confirmed and verified a method for predicting the RFL with a new method for S-N curve characterisation applicable for time dependent materials, using the fatigue damage as a function of two independent variables at a single stress ratio (R) under tension-tension loading. As a natural progression, the prediction of the RFL using the fatigue damage as a function of three independent variables has been desired.…”

Section: Introductionmentioning

confidence: 85%

“…In fact, the breaking point is usually not obtainable from a fatigue testing machine because of the limited controllability, but it can be obtained from a universal testing machine. A practical method for using the value of 0.5 is proposed for time-dependent materials applicable to metallic materials [8].…”

Section: The Theorymentioning

confidence: 99%

“…A Matlab script for determining α and β is available in ref. [8]. The two parameters (α and β) in Equation (3) are determined by numerically differentiating an experimental fatigue data set for (1 − σ max /σ uT ) versus N f , followed by linearization by taking log on both sides of the differentiated data set.…”

Section: The Theorymentioning

confidence: 99%

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A Practical Procedure for Predicting the Remaining Fatigue Life at an Arbitrary Stress Ratio

Kim

2022

J. Compos. Sci.

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A practical procedure for predicting the remaining fatigue life at an arbitrary stress ratio is developed and verified. The procedure was based on the validated damage function, in conjunction with the Kim and Zhang S-N curve model. The damage function was used for finding various iso-damage points dependent on three independent variables (i.e., stress level, number of fatigue cycles, and stress ratio). The verification was conducted using Alclad 24S-T aluminium alloy, available in the literature for fatigue loading varied under three different loading schemes. The first scheme was for two different stress ratios, the second was for three different stress ratios, and the last was for a single stress ratio as a special case. The prediction accuracies were found to be in an error range of −0.1 to 5.6%, −0.5 to −0.6, and 1.5 to 1.7% for the 1st, 2nd, and 3rd schemes, respectively.

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Section: Introductionmentioning

confidence: 85%

Section: The Theorymentioning

confidence: 99%

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A Practical Procedure for Predicting the Remaining Fatigue Life at an Arbitrary Stress Ratio

Kim

2022

J. Compos. Sci.

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“…The classification societies' rules prescribe the procedure for obtaining S-N curves for composite materials. Various authors have reported results obtained in modeling S-N curves for composites [29,34,35] and the prediction of the fatigue life of composite structures [27,43,44]. A failure model for groups of similar glass/polyester composites, such as the ones used in this research, can be defined in the form:…”

Section: Structural Durability Assessmentmentioning

confidence: 99%

Prediction of the Deterioration of FRP Composite Properties Induced by Marine Environments

Vizentin

Vukelić

2022

JMSE

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In this paper, a model for the prediction of fatigue life degradation of fiber-reinforced (FRP) composite materials exposed for prolonged periods to real marine environments is proposed. The data collected during the previous phases of a more comprehensive research of real marine environment-induced changes of mechanical properties in FRP composites are used to assess the influence of these changes on the durability characteristics of composites. Attention is paid to the classification societies’ design and exploitation rules on this matter. The need for the modification of the process used for obtaining composite material S–N curves, considering the influence of the marine environment, is studied. A regression analysis of the experimental data is conducted, resulting in a mathematical model of strength degradation over time. The regression analysis shows an acceptable correlation value. The S–N curves for E-glass/polyester composites with three different fiber layout configurations are evaluated and modified to encompass the findings of this research.

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“…Indeed, a large experimental library can be found in the literature regarding fatigue testing of UD or cross-ply laminates, in which mainly uniaxial stress states are developed [3][4][5][6][7][8][9][10][11]. The damage response of [45 • /−45 • ] laminates during fatigue has been also investigated [12,13].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Different Lay-Up Parameters on the Fatigue Response of Carbon/Epoxy Laminates under Internal Multiaxial Stress States

2021

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The inherent anisotropy of composites complicates their damage response. The influence of multiaxiality, particularly in carbon-based composites, is not thoroughly understood due to obstacles related to damage monitoring during loading. In this study, the response of different carbon/epoxy laminates under fatigue is examined through dedicated in situ microscopic observations. By varying the orientation of off-axis layers, the impact of multiaxiality on the mechanical and damage response is evaluated. Furthermore, balanced and unbalanced laminates are compared, considering the limited information for the latter. The influence of the number of off-axis layers is finally assessed leading to important conclusions about optimal fatigue response. The fatigue response is evaluated in all cases considering both the mechanical properties and the damage characteristics. Significant conclusions are drawn, especially for the benefits of unbalanced laminates and the impact of shear stresses, allowing for the utilization of the obtained data as important input for the establishment of reliable fatigue damage models.

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S-N Curve Characterisation for Composite Materials and Prediction of Remaining Fatigue Life Using Damage Function

Cited by 5 publications

References 13 publications

A Practical Procedure for Predicting the Remaining Fatigue Life at an Arbitrary Stress Ratio

A Practical Procedure for Predicting the Remaining Fatigue Life at an Arbitrary Stress Ratio

Prediction of the Deterioration of FRP Composite Properties Induced by Marine Environments

The Influence of Different Lay-Up Parameters on the Fatigue Response of Carbon/Epoxy Laminates under Internal Multiaxial Stress States

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