Modelling of interlaminar fracture processes in composites using interface elements

Bianchi, Sauro; Corigliano, Alberto; Frassine, R.; Rink, M.

doi:10.1016/j.compscitech.2005.04.034

Cited by 14 publications

(7 citation statements)

References 20 publications

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“…In our analysis of cracking and delamination in carbon fibre-reinforced laminates, a bilinear traction separation law used by a number of researchers [17][18][19][20][21] to describe the damage and fracture behaviour, was employed. A schematic example of a bi-linear tractionseparation law is shown in Fig.…”

Section: Cohesive Law and Its Parametersmentioning

confidence: 99%

Interaction of Matrix Cracking and Delamination in Cross-ply Laminates: Simulations with Stochastic Cohesive Zone Elements

2010

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Two main damage mechanisms of laminates-matrix cracking and inter-ply delaminationare closely linked together (Joshi and Sun 1). This paper is focussed on interaction between matrix cracking and delamination failure mechanisms in CFRP crossply laminates under quasi-static tensile loading. In the first part of the work, a transverse crack is introduced in 90o layers of the cross-ply laminate [01/904/01], and the stresses and strains that arise due to tensile loading are analyzed. In the second part, the cohesive zone modelling approach where the constitutive behaviour of the cohesive elements is governed by traction-displacement relationship is employed to deal with the problem of delamination initiation from the matrix crack introduced in the 90o layers of the laminate specimen. Additionally, the effect of microstructural randomness, exhibited by CFRP laminates on the damage behaviour of these laminates is also accounted for in simulations. This effect is studied in numerical finite-element simulations by introducing stochastic cohesive zone elements. The proposed damage modelling effectively simulated the interaction between the matrix crack and delamination and the variations in the stresses, damage and crack lengths of the laminate specimen due to the microstructural randomness.

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Section: Cohesive Law and Its Parametersmentioning

confidence: 99%

Interaction of Matrix Cracking and Delamination in Cross-ply Laminates: Simulations with Stochastic Cohesive Zone Elements

2010

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“…Dal punto di vista fenomenologico si è evidenziata la presenza di due diversi meccanismi di frattura, uno dei quali responsabile di una parziale instabilità durante la propagazione. Si sono poi determinate le proprietà all'innesco in accordo con la MF ed è stato applicato un approccio numerico di modellazione coesiva [7,8]. Lo strumento di calcolo ha prodotto risultati in buon accordo con i dati sperimentali relativi all'innesco.…”

Section: Andena Marta Rink Roberto Frassineunclassified

Applicazione della meccanica della frattura viscoelastica alla previsione della vita di tubi in polibutene

Andena

Rink

Frassine

2008

Frattura Ed Integrità Strutturale

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Isotactic polybutene-1 (i-PB1) is a polymer used for the manufacturing of pressurized pipes.\ud In this work two grades of i-PB1 with a different degree of isotacticity have been investigated; they have\ud been supplied by Basell Polyolefins.\ud Fracture tests have been performed at various temperatures and testing speeds. Two configurations have\ud been used, single edge notch bending (SENB) and double cantilever beam (DCB), the latter only to study\ud crack propagation. Optical methods have been used to detect crack initiation and measure propagation\ud speed.\ud From the phenomenological point of view, the formation of highly stretched material regions has been observed\ud during crack propagation. A continuous tearing of these regions as the crack advances has often been\ud interrupted by their sudden rupture, with the load decreasing accordingly. This partial instability has been\ud observed on both material grades, with both testing configurations.\ud Results of the tests have been interpreted using the fracture mechanics framework; a time-temperature superposition\ud scheme has been adopted to represent viscoelastic behavior over several decades. An analytical\ud model has been applied to predict the lifetime of pressurized pipes. A good agreement has been reported between\ud model predictions and experimental data obtained from tests on polybutene pipes

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“…The law that affords the best agreement is the one selected by the inverse procedure. On the contrary, several authors (Andena et al 2006;Bianchi et al 2006;Slowik et al 2006) developed inverse methods to identify the best CL without any previous assumption about its shape.…”

Section: Introductionmentioning

confidence: 98%

Determination of cohesive laws in wood bonded joints under mode I loading using the DCB test

et al. 2013

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The cohesive laws (CLs) have been investigated by means of direct and inverse methods concerning wood bonded joints under pure mode I. The experimental results were obtained by tests with double cantilever beam. The direct method is based on the differentiation of the relation between strain energy release rate and crack opening displacement at the crack tip. An equivalent crack method was used to evaluate the strain energy release rate in the course of the test without monitoring the crack length, which is difficult to observe exactly. The crack opening displacement was determined by postprocessing local displacements measured by digital image correlation. The inverse method requires a previous assumption of the CL shape, and as such, a trilinear law with bilinear softening relationship was selected. The cohesive parameters were identified by an optimization procedure involving a developed genetic algorithm. The idea is to minimize an objective function that quantifies the difference between the experimental and the numerical load-displacement curves resulting from the application of a given law. A validation procedure was performed based on a numerical analysis with finite elements. Both methods in focus provided good agreement with the experimental data. It was observed that CLs adopted by the inverse method are consistent with the ones obtained with the direct method.

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Modelling of interlaminar fracture processes in composites using interface elements

Cited by 14 publications

References 20 publications

Interaction of Matrix Cracking and Delamination in Cross-ply Laminates: Simulations with Stochastic Cohesive Zone Elements

Interaction of Matrix Cracking and Delamination in Cross-ply Laminates: Simulations with Stochastic Cohesive Zone Elements

Applicazione della meccanica della frattura viscoelastica alla previsione della vita di tubi in polibutene

Determination of cohesive laws in wood bonded joints under mode I loading using the DCB test

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