Fracture toughness of the tensile and compressive fibre failure modes in laminated composites
TL;DR: In this paper, the fracture toughness associated with fiber tensile failure and compressive fibre kinking in a T300/913 carbon-epoxy laminated composite are measured using compact tension and "compact compression" tests respectively.
About: This article is published in Composites Science and Technology.The article was published on 2006-10-01. It has received 507 citations till now. The article focuses on the topics: Ultimate tensile strength & Compressive strength.
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TL;DR: In this article, the impact damage of composite laminates in the form of intra-and inter-laminar cracking was modelled using stress-based criteria for damage initiation, and fracture mechanics techniques to capture its evolution.
476 citations
TL;DR: In this article, the authors investigated failure in Carbon Fibre Reinforced Plastics CFRP using Acoustic Emission (AE) signals collected and post-processed for various test configurations: tension, Compact Tension (CT), Compact Compression (CC), Double Cantilever Beam (DCB), and four-point bend End Notched Flexure (4-ENF).
457 citations
TL;DR: In this paper, the authors examined the use of a continuum damage model to predict strength and size effects in notched carbon-epoxy laminates and found that the model is the most accurate technique to predict size effects.
430 citations
TL;DR: A bottom-up, multiscale modeling approach is presented to carry out high-fidelity virtual mechanical tests of composite materials and structures and the roadmap for the extension of the current strategy to include functional properties and processing into the simulation scheme is delineated.
Abstract: A bottom-up, multiscale modeling approach is presented to carry out high-fidelity virtual mechanical tests of composite materials and structures. The strategy begins with the in situ measurement of the matrix and interface mechanical properties at the nanometer-micrometer range to build up a ladder of the numerical simulations, which take into account the relevant deformation and failure mechanisms at different length scales relevant to individual plies, laminates and components. The main features of each simulation step and the information transferred between length scales are described in detail as well as the current limitations and the areas for further development. Finally, the roadmap for the extension of the current strategy to include functional properties and processing into the simulation scheme is delineated.
315 citations
TL;DR: In this paper, the impact damage resistance of composite laminates with dispersed stacking sequences is evaluated by using finite element simulation methods, and the accuracy achieved with this method increases the reliability of numerical methods in the simulation of impact loads enabling the reduction of the time and costs associated with mechanical testing.
300 citations
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TL;DR: In this article, the inplane compressive fracture behavior of a carbon fiber-epoxy laminate containing a single hole is examined. Failure is due to 0° fibre microbuckling surrounded by delamination.
Abstract: The inplane compressive fracture behaviour of a carbon fibre-epoxy laminate containing a single hole is examined. Failure is due to 0° fibre microbuckling surrounded by delamination. The microbuckl...
217 citations
"Fracture toughness of the tensile a..." refers methods in this paper
...[3,4] carried out a kink-band propagation test using a centrenotched compression specimen....
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TL;DR: In this article, the compressive fracture properties of carbon fiber/epoxy laminates were investigated in terms of existing theories of strength, and it was found that compressive failure is governed by plastic microbuckling of the 0° plies.
Abstract: We present an investigation into the compressive fracture properties of carbon fibre/epoxy laminates. Unnotched and notched strengths are reported for a wide range of ‘lay-ups’, and results are interpreted in terms of existing theories of strength. In all cases, we find that compressive failure is governed by plastic microbuckling of the 0° plies. For unnotched laminates, the failure strain is independent of lay-up configuration, suggesting that a critical strain to failure, or maximum strain criterion can predict the failure point adequately. In tests on notched panels, the growth of damage from the edge of a single hole is examined. For notched materials, the failure strength and damage zone size at failure support the prediction of the Soutis, Fleck and Smith model.
130 citations
"Fracture toughness of the tensile a..." refers methods in this paper
...[3,4] carried out a kink-band propagation test using a centrenotched compression specimen....
[...]
TL;DR: In this article, a new method is presented for the calculation of the fracture energy associated with fiber microbuckling, a parameter required in the Soutis et al. linear softening cohesive zone model for the prediction of the open hole compression strength.
Abstract: Cohesive zone models have had notable success in the prediction of damage from notches in engineering materials loaded in tension. They have also been used to determine the growth of fibre microbuckling from a hole in a composite laminate under compression, (Soutis C, Fleck NA, Smith PA. Failure prediction technique for compression loaded carbon fibre/epoxy laminate with an open hole. J Compos Mater, 1991;25(11):1476–1498). The usual strategy is to replace the inelastic deformation associated with plasticity or microbuckling with a line-crack and to assume some form of stress-displacement bridging law across the crack faces. For instance, in the Dugdale analysis of plastic deformation in metals from the root of a notch (Dugdale DS. Yielding of steel sheets containing slits, J Mech Phys Solids, 1960;8:100–104), it is assumed that the bridging normal traction across the crack faces equals the tensile yield strength of the solid. The material response elsewhere in the cracked structure is assumed to be linear elastic. In this paper, a new method is presented for the calculation of the fracture energy G c associated with fibre microbuckling, a parameter required in the Soutis et al. linear softening cohesive zone model for the prediction of the open hole compression strength. Theoretical results are found to be in good agreement with experimental data for several carbon fibre–epoxy laminates.
92 citations
TL;DR: In this article, the authors investigated the interlaminar and intralaminar fracture toughness of a thermoplastic and a toughened thermosetting polymer reinforced with aligned and cross-ply carbon fibres over a wide range of temperature.
87 citations
TL;DR: In this paper, the intralaminar mode I fracture toughness values for a M55J/M18 carbon/epoxy cross-ply laminate [0°/90°]15 (alternate 0 and 90° layers) and its constituent sub-laminates are theoretically evaluated on the basis of a modified crackclosure integral (MCCI) method corresponding to the fracture loads obtained by testing C(T) specimens.
84 citations