R-curve behaviour of the mixed-mode I/II delamination in carbon/epoxy laminates with unidirectional and multidirectional interfaces
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TLDR
In this article, the authors investigated the complete R-curve behavior of the unidirectional and multidirectal carbon/epoxy composite laminates and proposed a semi-empirical expression to predict the mixed-mode I/II delamination behavior.About:
This article is published in Composite Structures.The article was published on 2019-09-01 and is currently open access. It has received 49 citations till now. The article focuses on the topics: Fracture toughness & Composite laminates.read more
Figures
Fig. 5. Fracture toughness versus the delamination growth length for the +22.5°/-22.5° interface. 
Fig. 6. Fracture toughness GI versus GII for the (a) 0°/0° and (b) +22.5°/-22.5° interfaces. Note: a constant mode II fracture toughness is used for each interface. 
Fig. 8. Comparison of the experiment MMB R-curves and the predicted ones by Eq. (13), (a) 0°/0° interface and (b) +22.5°/-22.5° interface. 
Fig. 7. Initiation and steady-state propagation failure loci for the (a) 0°/0° and (b) +22.5°/-22.5° interfaces. 
Table 1 Values of the lever length c for the MMB tests (Unit: mm). 
Table 2 Detailed values of lbz, GInit and GProp for each interface and φ-ratio.
Citations
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Journal ArticleDOI
A modified mode I cohesive zone model for the delamination growth in DCB laminates with the effect of fiber bridging
TL;DR: In this paper, a physical-based three-linear CZM superposed by two bilinear CZMs was proposed to represent two different phenomena including the quasi-brittle matrix fracture characterized by a higher peak stress and a shorter critical opening displacement.
Journal ArticleDOI
A novel four-linear cohesive law for the delamination simulation in composite DCB laminates
TL;DR: In this paper, a novel four-linear cohesive law is proposed, which is physically established based on the realistic failure mechanism during the delamination process and the required parameters in this law can be determined by experiments, expect for the fracture toughness ratio, which was introduced to present the non-linear softening behavior of the bridging fibers in a simple way and make the cohesive law easy to be implemented in FEM.
Journal ArticleDOI
Delamination in carbon fiber epoxy DCB laminates with different stacking sequences: R-curve behavior and bridging traction-separation relation
TL;DR: In this paper, the effect of stacking sequence on the R -curve and traction-separation relation in unidirectional and multidirectal CFRP DCB laminates with designed generic + θ°/−θ° and 0°/ǫ° interfaces were systematically investigated, and interpreted combining with the fractographical analysis of failed fracture surface.
Journal ArticleDOI
A simple procedure for determining the mode I bridging stress of composite DCB laminates without measuring the crack opening displacement
TL;DR: In this article, a simple procedure is proposed for the determination of mode I bridging law in composite double cantilever beam (DCB) specimens, where the crack opening displacement at the initial pre-crack tip is obtained by a numerical method based on the experimental R-curve from standard DCB tests.
Journal ArticleDOI
Experimental and numerical investigations on the mode I delamination growth behavior of laminated composites with different z-pin fiber reinforcements
TL;DR: In this paper , the effect of elastic modulus of z-pins on the delamination behavior of two kinds of Z-pinned laminates is experimentally and numerically studied.
References
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Journal ArticleDOI
Measurement of mixed-mode delamination fracture toughness of unidirectional glass/epoxy composites with mixed-mode bending apparatus
Malk Benzeggagh,M. Kenane +1 more
TL;DR: In this paper, the authors evaluated the initiation of cracking and delamination growth in a unidirectional glass/epoxy composite under mode I, mode ZZ, and mixed mode I + II static loading.
Journal ArticleDOI
Delamination fracture of multidirectional carbon-fiber/epoxy composites under Mode I, Mode II and Mixed-Mode I/II loading
TL;DR: In this paper, the authors considered the variation of the interlaminar failure energy, GC, with the extent of crack jumping, and ensuing fiber bridging, which arises during the growth of the delamination in the multidirectional-laminates under the various modes of loading.
Journal ArticleDOI
Simulation of delamination growth in multidirectional laminates under mode I and mixed mode I/II loadings using cohesive elements
TL;DR: In this article, a numerical model for accurately predicting the delamination propagation in multidirectional laminates under mode I and mixedmode I/II loadings using the cohesive element is proposed.
Journal ArticleDOI
Finite element modeling of mode I delamination growth in laminated DCB specimens with R-curve effects
TL;DR: In this article, a three-linear cohesive zone model (CZM) is proposed to capture the mode I delamination initiation and propagation behavior of unidirectional DCB specimens under large-scale fiber bridging conditions.
Journal ArticleDOI
A mixed-mode failure criterion derived from tests on symmetric and asymmetric specimens
F. Ducept,D. Gamby,Peter Davies +2 more
TL;DR: In this article, the authors used the double cantilever beam (DCB) specimen for mode I, end-notched flexure (ENF) for mode II and mixed-mode bending (MMB) for I/II mixedmode loading.