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Arteiro, A., C. Catalanotti, J. Xavier, and P. P. Camanho. "Notched response of non-crimp fabric thin-ply laminates: analysis methods." Composites Science and Technology. 88 (2013): 165-171. Abstract
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Arteiro, A., G. Catalanotti, J. Xavier, P. Linde, and P. P. Camanho. "A strategy to improve the structural performance of non-crimp fabric thin-ply laminates." Composite Structures. 188 (2018): 438-449. AbstractWebsite

The enhanced mechanical performance of thin-ply laminates results from their ability to delay the onset of damage typically observed in composite materials. However, in notched structures, subcritical damage growth causes beneficial stress redistributions in the vicinity of the notch, blunting the stress concentration. Precluding these damage mechanisms, as in thin-ply laminates, may potentially lead to inferior notched responses. To obviate this limitation of thin-ply laminates, a strategy based on the combination of standard grade 0� plies and thin transverse and off-axis plies is analysed in this paper. A detailed study of the effect of 0� ply blocking is carried out, with particular emphasis on the blunting mechanisms and notched response. Tests on scaled notched panels loaded in tension, with notch sizes between 6?mm and 30?mm, show that the combination of standard grade 0� ply blocks with thin transverse and off-axis plies promotes localised fibre-matrix splitting, which acts as an important notch blunting mechanism, while preventing matrix cracking and delamination. This results in an improved notched response and superior large damage capability. It is also shown that thicker 0� ply blocks provide higher stability in composite bolted joints, while the thin transverse and off-axis plies contribute for matrix-dominated damage suppression, resulting in an improved bolt-bearing response. The improvements of the large damage capability and bolt-bearing performance are obtained without compromising the superior unnotched tensile and compressive strengths intrinsic to thin-ply laminates.

Arteiro, A., G. Catalanotti, J. Xavier, and P. P. Camanho. "A Finite Fracture Mechanics Model for the Prediction of the Notched Response and Large Damage Capability of Composite Laminates." Advances in Fracture and Damage Mechanics XIII. Vol. 627. Key Engineering Materials, 627. Trans Tech Publications, 2015. 13-16. Abstract

A new model based on Finite Fracture Mechanics (FFMs) has been proposed to predict the open-hole tensile strength of composite laminates [1]. Failure is predicted when bothstress-based and energy-based criteria are satisfied. This model is based on an analytical solution, and no empirical adjusting parameters are required, but only two material properties: the unnotched strength and the fracture toughness. In the present work, an extension of the proposed FFMs model to predict the notched response of composite laminates with notch geometries other than a circular opening [2] is presented and applied to the prediction of size effects on the tensile and compressive notched strength of composite laminates. The present model is also used to assess the notch sensitivity and brittleness of composite laminates by means of versatile design charts and by the identification of a dimensionless parameter designated as notch sensitivity factor. A further extension of the FFMs model is proposed, which takes into account the crack resistance curve of the laminate in the model's formulation, and it is used to predict the large damage capability of a non-crimp fabric thin-ply laminate [3].

Arteiro, A., G. Catalanotti, J. Xavier, and P. P. Camanho. "Large damage capability of non-crimp fabric thin-ply laminates." Composites Part A: Applied Science and Manufacturing. 63 (2014): 110-122. AbstractWebsite
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Arteiro, A., G. Catalanotti, J. Xavier, and P. P. Camanho. "Notched response of non-crimp fabric thin-ply laminates." Composites Science and Technology. 79 (2013): 97-114. Abstract
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