Empirical models for matrix cracking in a CFRP cross‐ply laminate under static‐ and cyclic‐fatigue loadings

Ogi, Keiji; Takahashi, Manabu; Yashiro, Shigeki

doi:10.1002/pc.21192

Cited by 3 publications

(2 citation statements)

References 28 publications

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“…Even slight perfection in the fabrication process can improve the laminate strength for a particular loading category. [29][30][31][32] Hence, the prediction accuracy of Anisomorphic CLD can vary with the fabrication technique and cannot be employed straight away for any random laminate or stacking sequence. Anisomorphic CLDs can be used after experimental cross-verification as it saves enormous money and effort behind a reliable life envelope prediction.…”

Section: Comparison Of Prediction Accuracymentioning

confidence: 99%

A modified piecewise linear constant life diagram for fatigue life prediction of carbon fiber/polymer multidirectional laminates

et al. 2022

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Prediction accuracy of constant life diagrams (CLDs) for fiber-reinforced plastics varies with the stacking, tensile/compression dominated failure, input S-N curves, the complexity of the plot, and so forth. The article's authors propose a modified piecewise linear CLD and compare its prediction accuracy with traditional piecewise and 2-segment anisomorphic CLD. The constant amplitude fatigue life data for three different carbon fiber reinforced polymer composites multidirectional laminates that is (+45, À45, +45, and À45) 2S , (+45, À45, 0, and 90) 2S , and (0, 90, 0, and 90) 2S were generated at five different stress ratios (R = σ min /σ max ) that is, R = 0.1 and 0.5 (T-T), À1 and critical stress ratio (T-C), and 5 (C-C). The proposed modified Piecewise linear CLD considers the critical stress ratio (UCS/UTS) as a definite input node. The prediction accuracy of the proposed CLD and others was evaluated using additional fatigue testing at random stress ratios and stress levels. The proposed CLD showed the highest prediction accuracy compared to Piecewise or Anisomorphic CLD. The non-linear CLD plotted using single S-N curve data may save time and effort but achieving absolute accuracy will ultimately depend on the stacking sequence.

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Section: Comparison Of Prediction Accuracymentioning

confidence: 99%

A modified piecewise linear constant life diagram for fatigue life prediction of carbon fiber/polymer multidirectional laminates

et al. 2022

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“…To study CFRP materials, X‐ray radiography has been used first. Various other techniques have been used since these pioneer works: optical microscopy, full‐field displacement measurements or high‐resolution visible camera . All of these different techniques cannot easily be used to monitor matrix cracking during a dynamic tensile test because of two major issues.…”

Section: Introductionmentioning

confidence: 99%

Passive infrared thermography measurement of transverse cracking evolution in cross‐ply laminates

Berthe

Ragonet

2018

Strain

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Over the last decades, various experimental methodologies have been used to study the matrix crack density evolution in cross-ply laminates. The main drawback of these techniques is their difficult use at intermediate and high strain rates. In this study, a new experimental protocol to evaluate matrix crack density evolution at intermediate strain rates is proposed and applied to [0∕90 3 ] s carbon/epoxy laminate. It is based on the use of passive infrared thermography to monitor the matrix cracking appearance. This methodology is used to first demonstrate that the crack appearance in the 90 • ply remains instantaneous from side to side with the increase of the strain rate. Finally, the rate insensitivity of the crack density as a function of the applied stress for the studied material in the studied range of strain rates (8.3 × 10 −4 up to 6.69 × 10 −2 s −1 ) is demonstrated. KEYWORDScomposite materials, crack density, infrared thermography, strain rate dependency, transverse cracking Strain. 2018;54:e12293.wileyonlinelibrary.com/journal/str

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Measurement of the in situ transverse tensile strength of composite plies by means of the real time monitoring of microcracking

Sebaey

Costa

Maimí

et al. 2014

Composites Part B: Engineering

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Empirical models for matrix cracking in a CFRP cross‐ply laminate under static‐ and cyclic‐fatigue loadings

Cited by 3 publications

References 28 publications

A modified piecewise linear constant life diagram for fatigue life prediction of carbon fiber/polymer multidirectional laminates

A modified piecewise linear constant life diagram for fatigue life prediction of carbon fiber/polymer multidirectional laminates

Passive infrared thermography measurement of transverse cracking evolution in cross‐ply laminates

Measurement of the in situ transverse tensile strength of composite plies by means of the real time monitoring of microcracking

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