A modified Paris relation for fatigue delamination with fibre bridging in composite laminates

Yao, Liaojun; Sun, Yi; Guo, Licheng; Zhao, Minghua; Jia, Liyong; Alderliesten, R.C.; Benedictus, Rinze

doi:10.1016/j.compstruct.2017.05.070

Cited by 35 publications

(34 citation statements)

References 33 publications

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“…All these studies indicate the SERR applied on crack front seems a reasonable parameter in representing the similitude in fibre-bridged fatigue crack growth. The same conclusion was also made by Yao et al [25,26], via energy dissipation analysis and damage mechanism examinations on fibre-bridged FDG. Accordingly, a modified Paris relation has been proposed to appropriately explore fibre-bridged fatigue delamination behaviors [26].…”

Section: Introductionsupporting

confidence: 79%

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Fibre-bridged fatigue delamination in multidirectional composite laminates

Yao

Cui

Sun

et al. 2018

Composites Part A: Applied Science and Manufacturing

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The influence of fibre bridging on delamination failure in multidirectional composite laminates with different thickness scales is characterized, and the dependence of fibre bridging significance on laminate thickness as well as loading regime is investigated in this paper. Both quasi-static and fatigue resistance curves (R-curve) are experimentally determined to quantify the significance of fibre bridging in delamination growth. The results clearly demonstrate that thickness has effect on the amount of fibre bridging in quasi-static delamination. And the significance of fibre bridging decreases with the increase in laminate thickness. However, the situation for fatigue delamination growth (FDG) is much more complicated. The difference in fibre bridging generation seems to be insignificant in short fatigue cracks and at the plateau state, whereas more bridging fibres can be present in a thinner laminate in-between state. Loading regimes also have significant effect on the amount of fibre bridging. The results clearly demonstrate that more bridging fibres can be generated in quasi-static delamination compared to fatigue. A modified Paris relation proposed by the authors in previous studies is employed in present study to determine fibre-bridged FDG behaviors in multidirectional composite laminates with various thickness scales. All fatigue data locate in a relatively narrow band region of the resistance graph, resulting in a master resistance curve in determining fatigue delamination behaviors. This clearly demonstrates that neither thickness nor fibre bridging has significant effect on fatigue delamination behaviors, if the similarity is well represented.

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Section: Introductionsupporting

confidence: 79%

“…According to our previous experimental experience in this field [25,26,29], a special test procedure was programed to determine fatigue delamination with different amounts of fibre bridging. DCB specimens were repeatedly tested for several times with different pre-crack lengths, but keeping R-ratio the same.…”

Section: (B)mentioning

confidence: 99%

Fibre-bridged fatigue delamination in multidirectional composite laminates

Yao

Cui

Sun

et al. 2018

Composites Part A: Applied Science and Manufacturing

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“…This seems further illustrated by Yao et al [27] when proposing an alternative effective SERR parameter after [37], defined as where G 0 is derived from extrapolating the trend illustrated in Figure 3 back to a-a 0 = 0, while the denominator relates to any point on the trend line of Figure 3. This approach is very simple, and technically performs an analogous or similar procedure as proposed above.…”

Section: Ways Forward To Standardizationmentioning

confidence: 99%

“…Note that the average value of ∆√G T at an arbitrary value of da/dN = 4.5⋅10 -7 m/cycle plotted against the corresponding crack increment a-a 0 yields a nonlinear relationship that either can be approximated with a bilinear presentation [27], or with a second order polynomial function of a-a 0 . The reason for the curve to approximately become horizontal is attributed to full saturation or full y = 7.0499E-27x 9.4103E+00 y = 1.3617E-28x 9.7399E+00 y = 3.0676E-28x 8.9034E+00 y = 3.3583E-27x 8.1226E+00 y = 6.3399E-31x 9.3234E+00 y = 2.8801E-29x 8.6663E+00…”

Section: Data Evaluationmentioning

confidence: 99%

“…Here, it is assumed to represent a polynomial relationship gradually developing to a horizontal asymptote imposed by full fibre bridging development, while in [27] a bilinear relationship is assumed. Further scrutiny of the results is required to decide which type of relationship is preferred before fatigue delamination experiment can be standardized following these procedures.…”

Section: Ways Forward To Standardizationmentioning

confidence: 99%

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