Alternative test method for interlaminar fracture toughness of composites

Gunderson, Joshua D.; Brueck, John F.; Paris, Anthony J.

doi:10.1007/s10704-007-9063-8

Cited by 45 publications

(19 citation statements)

References 4 publications

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“…the loading angle). Although a few experimental setups exist in literature for determination of the interface fracture toughness over the full range of mode mixities,10–18 simultaneous in situ microscopic visualization of the fracture process zone is crucial to identify the delamination mechanism(s) and to measure mechanical interface data such as the strain field around the crack tip. Moreover, deduction of relevant interface parameters from the mechanical measurements requires a dedicated simulation‐based parameter identification procedure.…”

mentioning

confidence: 99%

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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confidence: 99%

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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“…Experimental methods based on linear elastic fracture mechanics (LEFM) approaches [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] are widely used in the literature for delamination studies. The critical load for delamination together with information about the crack length are the only values required from the experiment to obtain the interface toughness using existing LEFM approaches (assuming the geometry and material properties of the adherent layers are known).…”

Section: Resultsmentioning

confidence: 99%

An in-situ experimental-numerical approach for interface delamination characterization

Hoefnagels

Kolluri

Dommelen

et al. 2011

Experimental and Applied Mechanics, Volume 6

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Interfacial delamination is a key reliability challenge in composites and micro-electronic systems due to (high density) integration of dissimilar materials. Predictive finite element models are used during the design and optimization stage to minimize delamination failures, however, they requires a relevant interface model to capture the (irreversible) crack initiation and propagation behavior observed in experiments. Therefore, a set of experimental-numerical tools is presented to enable accurate characterization of delamination mechanism(s) and prediction of the interface mechanics. First, a novel Miniature Mixed Mode Bending (MMMB) delamination setup is presented that enables in-situ SEM characterization of interface delamination mechanisms while sensitively measuring global load-displacement curves for the full range of mode mixities. Accurate determination of the critical energy release rate from the global load-displacement curve requires, however, identification and separation of bulk plastic contributions from the measured total energy dissipation; to this end, an analytical procedure is presented. Finally, a cohesive zone model suitable for mixed mode loading with realistic coupling is presented that can capture the range of interface failure mechanisms from damage to plasticity, as observed in-situ with SEM, as well as a parameter identification procedure. The set of experimental-numerical tools is validated on delamination measurements of a glue interface.

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“…The total energy release rate (G T ) was calculated by equations (15), (16) and (17), and the ratio mixity given by equation (18). The J MMB was evaluated using equation (9). The values of mixed-mode interlaminar fracture toughness obtained from both methods are presented in Figure 7(b), and good agreement was found in all mode mixities.…”

Section: Mixed-mode I/ii Interlaminar Fracture Toughnessmentioning

confidence: 97%

“…A closed form solution of J-integral for the DCB specimen was derived by Anthony and Paris 11 to evaluate the mode I interlaminar fracture toughness. Following this work, Gunderson et al 9 performed the DCB tests on GFRP specimens using both the J-integral method and the ASTM standard procedure. A video camera and transducers were used to monitor the delamination length and record the beam angles at the loading points, respectively.…”

Section: Introductionmentioning

confidence: 99%

Measurement of interlaminar fracture properties of composites using the J-integral method

Zhao

Seah

Chai

2016

Journal of Reinforced Plastics and Composites

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This study explored the use of J-integral approach for characterizing mode I, mode II and mixed-mode I/II interlaminar fracture toughness of composites materials. Delamination tests were conducted to measure the fracture toughness and the resistance curve (R-curve) for double cantilever beam, end-notched flexure and mixed-mode bending specimens. The J-integral approach and the well-established ASTM standard methods based on LEFM were compared in this work. The results obtained from both methods are in very good agreement. However, the J-integral method has the advantages of being applicable to materials with large fracture process zone (e.g., composites with fiber bridging) and provides a simpler experimental procedure with fewer inputs. More importantly, the presented method avoids the ambiguity in visual measurements of delamination length required by the ASTM standard methods. In this study, an image-processing program based on Hough transform was developed to obtain the rotation angles of the specimen. The method provides good accuracy and has lower requirements for image resolution, light and material surface compared to previous methods.

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Alternative test method for interlaminar fracture toughness of composites

Cited by 45 publications

References 4 publications

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

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

An in-situ experimental-numerical approach for interface delamination characterization

Measurement of interlaminar fracture properties of composites using the J-integral method

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