An experimental investigation into size effects in quasi-isotropic carbon/epoxy laminates with sharp and blunt notches

Xu, Xiaodong; Wisnom, Michael R; Mahadik, Yusuf; Hallett, Stephen R.

doi:10.1016/j.compscitech.2014.06.002

Cited by 67 publications

(61 citation statements)

References 18 publications

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“…For very large holes (25.4 mm and 50.8 mm), it was found that the stress blunting effect of the 0° splitting is eliminated, and the strength is asymptotic to a Weibull strength scaling line [13]. The implication is that the specimens need to be sufficiently large to be representative of the scaling behaviour at even larger sizes [13].…”

Section: Introductionmentioning

confidence: 99%

“…The hole diameter-to-width ratio was kept constant (0.2) for the previous specimens. A larger Scale 16 open-hole specimens (D = 50.8 mm) was also tested [13], with only the width and hole diameter of the specimen being scaled up, while the gauge length was kept the same as the one-size-smaller Scale 8 specimen (D = 25.4 mm). This was due to the limitations of the testing and manufacturing facilities.…”

Section: Test Setupmentioning

confidence: 99%

“…The implication is that the specimens need to be sufficiently large to be representative of the scaling behaviour at even larger sizes [13]. However, the previous Weibull strength scaling line was drawn through the point representing the largest open-hole specimens [13], and only its slope was predicted. Very small holes, less than 1 mm-diameter have not been studied before.…”

Section: Introductionmentioning

confidence: 99%

“…It has been shown that Weibull strength scaling theory applies for unidirectional (UD) laminates [1], and for large quasi-isotropic laminates with open holes [13], with the same Weibull modulus applicable in both cases. The current study demonstrates that the same Weibull strength scaling law also applies to unnotched quasi-isotropic laminates, and shows the relationship to the UD strength and scaling.…”

Section: Introductionmentioning

confidence: 99%

“…To better understand the phenomena of stress concentrations arising due to the introduction of different sized holes, the strength scaling in open-hole quasi-isotropic laminates under tensile loads has been investigated [11][12][13][14]. The hole diameters of the quasiisotropic open-hole specimens were from 1 mm to about 50 mm.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Unification of strength scaling between unidirectional, quasi-isotropic, and notched carbon/epoxy laminates

Wisnom

Chang

et al. 2016

Composites Part A: Applied Science and Manufacturing

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Section: Introductionmentioning

confidence: 99%

Section: Test Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Unification of strength scaling between unidirectional, quasi-isotropic, and notched carbon/epoxy laminates

Wisnom

Chang

et al. 2016

Composites Part A: Applied Science and Manufacturing

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2017

Mechanics of Aeronautical Composite Materials

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Tensile and flexural damage response of symmetric angle‐ply carbon fiber‐reinforced epoxy laminates: Non‐linear response and effects of thickness and ply‐stacking sequence

et al. 2019

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Advanced fiber reinforced composites have excellent specific strength and stiffness properties, but tend to be limited by linear elastic response and sudden, brittle failure. This lack of ductility greatly limits the structural efficiency of reinforced composite designs. Hence, achieving some non-linear behavior is desirable and it can help composite structures to maintain functionality even when they are overloaded to improve safety and reduce the applied safety factors. The aim of this study is to characterize and assess the effect of laminate thickness and the type of scaling technique on the damage response of symmetric angle-ply carbon fiber-reinforced polymer (CFRP) composite laminates subjected to tensile and flexural loading. This study considers the different behavior of the composite material under tension and compression in order to evaluate their influence on the failure modes. Tensile and three-point bending tests were carried out to determine the mechanical response in terms of strength and stiffness of the different CFRP laminates. Optical micrographs of failed samples were used to assess damage mechanisms of the different configurations. It was observed that non-linear behavior and high strains to failure could be achieved with angle-ply laminates. Furthermore, the maximum flexural strength increased and maximum flexural strain decreased as laminate thickness increased. Finally, the results obtained demonstrate that introducing ply clustering had a negative effect on the mechanical performance and pseudo-ductility exhibited by angle-ply laminates. POLYM. COMPOS., 40:3678-3690, 2019. FIG. 8. Average flexural stress-strain curves of the angle-ply samples and cross-sectional micrographs of the failed regions. (a) Average flexural stress-strain curves for the sublaminate angle-ply samples as a function of the laminate thickness. (b) Average flexural stress-strain curves for the ply-level angle-ply samples as a function of the laminate thickness. (c) Comparative of average flexural stress-strain curves as a function of the type of scaling. [Color figure can be viewed at wileyonlinelibrary.com]

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An experimental investigation into size effects in quasi-isotropic carbon/epoxy laminates with sharp and blunt notches

Cited by 67 publications

References 18 publications

Unification of strength scaling between unidirectional, quasi-isotropic, and notched carbon/epoxy laminates

Unification of strength scaling between unidirectional, quasi-isotropic, and notched carbon/epoxy laminates

Bibliography

Tensile and flexural damage response of symmetric angle‐ply carbon fiber‐reinforced epoxy laminates: Non‐linear response and effects of thickness and ply‐stacking sequence

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