Development of a methodology for determination of interface fracture toughness of laminate composites—the 0°/90° pair

Banks‐Sills, Leslie; Boniface, V.; Eliasi, Rami

doi:10.1016/j.ijsolstr.2004.06.025

Cited by 39 publications

(30 citation statements)

References 31 publications

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“…Banks-Sills, with several co-workers, focused on computational fracture mechanics using finite element analysis to study bimaterial interface fracture and compute complex stress intensity factors [64][65][66][67][68][69][70]. Over the past decade their research has also included the study of interlaminar fracture in composite laminates.…”

Section: A Methodology Based On a Conservative M-integralmentioning

confidence: 99%

“…Over the past decade their research has also included the study of interlaminar fracture in composite laminates. An approach for calculating the energy release rate and the phase angles along the delamination front as well as measuring the interface fracture properties of a composite materials [68][69][70] was developed.…”

Section: A Methodology Based On a Conservative M-integralmentioning

confidence: 99%

“…To date, validation of the method has only be established for 0°/90° and +45°/−45° interfaces. Details are given in reference [69]. Application examples for an embedded delamination in a cross-ply composite and through the width delaminations are presented in references [74,75].…”

Section: A Methodology Based On a Conservative M-integralmentioning

confidence: 99%

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Fracture Mechanics Analyses for Interface Crack Problems - A Review

Krueger

Shivakumar

Raju

2013

54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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Recent developments in fracture mechanics analyses of the interfacial crack problem are reviewed. The intent of the review is to renew the awareness of the oscillatory singularity at the crack tip of a bimaterial interface and the problems that occur when calculating mode mixity using numerical methods such as the finite element method in conjunction with the virtual crack closure technique. Established approaches to overcome the nonconvergence issue of the individual mode strain energy release rates are reviewed. In the recent literature many attempts to overcome the nonconvergence issue have been developed. Among the many approaches found only a few methods hold the promise of providing practical solutions. These are the resin interlayer method, the method that chooses the crack tip element size greater than the oscillation zone, the crack tip element method that is based on plate theory and the crack surface displacement extrapolation method. Each of the methods is validated on a very limited set of simple interface crack problems. However, their utility for a wide range of interfacial crack problems is yet to be established.

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Section: A Methodology Based On a Conservative M-integralmentioning

confidence: 99%

Section: A Methodology Based On a Conservative M-integralmentioning

confidence: 99%

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Fracture Mechanics Analyses for Interface Crack Problems - A Review

Krueger

Shivakumar

Raju

2013

54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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“…To this end, the Stroh formalism [3] was used to determine the first term of the asymptotic expressions for the stress and displacement fields in the neighborhood of the delamination front. Similar methods have been used for straight through delaminations in cross-plies [4,5].The experimental set-up consists of an Instron loading machine (no. 8872) with a load cell of maximum load 250 N. This small load cell is required since the maximum load at fracture is approximately 60 N. The Instron measures the load as a function of time.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

Delamination Tests of DCB Specimens Composed of Woven Composites

Banks‐Sills

Aboudi

Eliasi

et al. 2010

EPJ Web of Conferences

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In this investigation, quasi-static fracture tests double cantilever beam (DCB) woven composite specimens containing a straight through delamination are presented. The specimen is shown in Fig. 1. The fibers are carbon 300T which are transversely isotropic. The epoxy matrix is 913 and is isotropic. Each ply is a balanced plain weave of carbon fiber yarn in an epoxy matrix. The plies are laid up so that they alternate between a 0°/90° and a +45°/ − 45° weave. There are 15 plies with the delamination located between the seventh and eighth plies. Thus the interface is between a 0°/90° weave and a +45°/ − 45° weave. Each of these plies is anisotropic.Mechanical properties were calculated by means of the High Fidelity Generalized Method of Cells (HFGMC) [1]. The specimens are based on the ASTM Standard D5528-01 [2] which is used for testing unidirectional composites. In order to obtain a relation between the interface energy release rate Gi, the mode mixity phase angles, the applied load and crack length, finite element analyses were carried out. The stress intensity factors were determined by means of an interaction energy integral. To this end, the Stroh formalism [3] was used to determine the first term of the asymptotic expressions for the stress and displacement fields in the neighborhood of the delamination front. Similar methods have been used for straight through delaminations in cross-plies [4,5].The experimental set-up consists of an Instron loading machine (no. 8872) with a load cell of maximum load 250 N. This small load cell is required since the maximum load at fracture is approximately 60 N. The Instron measures the load as a function of time.

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An In Situ Experimental‐Numerical Approach for Characterization and Prediction of Interface Delamination: Application to CuLF‐MCE Systems

et al. 2012

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Prevention of delamination failures by improved design calls for accurate characterization and prediction of mixed‐mode interface delamination. In this paper, a combined in situ experimental‐numerical approach is presented to fully characterize the interface behavior for delamination prediction. The approach is demonstrated on two types of industrially‐relevant interface samples – coated copper lead frame‐black molding compound epoxy and uncoated copper lead frame‐white molding compound epoxy, – for which the delamination behavior is characterized in detail using a miniaturized in situ SEM mixed‐mode bending setup and simulated using a newly developed self‐adaptive cohesive zone (CZ) finite element framework. To this end, mixed‐mode load‐displacement responses, fracture toughness versus mode angle trends, and real‐time microscopic observations of the delamination front are analyzed to determine all CZ parameters. The various simulation results are found to be in agreement with experiments for the range of mode mixities accessible, demonstrating the ability of the characterization procedure to accurately obtain the cohesive properties of different interfaces, as well as the stability and efficiency of the self‐adaptive CZ framework.

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Development of a methodology for determination of interface fracture toughness of laminate composites—the 0°/90° pair

Cited by 39 publications

References 31 publications

Fracture Mechanics Analyses for Interface Crack Problems - A Review

Fracture Mechanics Analyses for Interface Crack Problems - A Review

Delamination Tests of DCB Specimens Composed of Woven Composites

An In Situ Experimental‐Numerical Approach for Characterization and Prediction of Interface Delamination: Application to CuLF‐MCE Systems

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