Influence of the Mode Mix of Precracking on the Delamination Toughness of Laminated Composites

Davidson, Barry D.; Koudela, Kevin L.

doi:10.1177/073168449901801504

Cited by 10 publications

(6 citation statements)

References 11 publications

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“…Here, the mode I data indicates extensive fiber bridging. Thus, instead of considering these data (which, as indicated in Table 1, were precracked under 75% mode I conditions), one could follow ASTM D5528 [7] to determine G Ic , and perform precracking under the mode mix of interest for the remaining tests [10,28].…”

Section: Discussionmentioning

confidence: 99%

“…Precracks created under high mode I conditions may invalidate delamination toughness data due to fiber bridging. Further, if precracks for all the mode ratios are created under a single mode mix, this may invalidate delamination toughness data due to the lack of self-similar growth during the test [28]. Thus, if precracking is to be done, it should be done at the same mode ratio as the test itself.…”

Section: Graphical Comparisonsmentioning

confidence: 99%

“…Thus, if precracking is to be done, it should be done at the same mode ratio as the test itself. Further details on the reasoning for this recommendation are presented in [28].…”

Section: Graphical Comparisonsmentioning

confidence: 99%

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An Accurate Mixed-mode Delamination Failure Criterion for Laminated Fibrous Composites Requiring Limited Experimental Input

Davidson

Zhao

2006

Journal of Composite Materials

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A mixed-mode delamination failure criterion is proposed that may be characterized using test data from only double cantilever beam, end-notched flexure, and single leg bending tests. For validation, a comprehensive literature survey is first performed to obtain toughness versus mode mix data for continuous fiber polymeric matrix composites, and the proposed criterion is then evaluated using those studies where sufficient data are reported. To this end, the criterion is used to obtain an expression for toughness versus mode mixity using only a subset of the experimental data that is presented in any given source. This is done using the toughness data from mode I and mode II tests that are performed, as well as the results from the test with a mode ratio closest to that of the single leg bending test. The failure locus predicted by the new criterion is then compared to the experimentally determined toughnesses over the full range of the experimental data. These results indicate that the proposed criterion is highly accurate for materials spanning a wide range of classifications of fiber reinforced polymeric matrix composites. Further, the accuracy of the proposed criterion is found to be equal to or better than other delamination failure criteria that have been utilized in the past, including those that use a great deal more experimental data for their characterization. It is concluded that the proposed criterion, which can be obtained from only a few simple tests, has predictive accuracy that is similar to that obtained using a failure locus that is fully characterized experimentally. A variety of practical uses of this new criterion are also described.

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Section: Discussionmentioning

confidence: 99%

Section: Graphical Comparisonsmentioning

confidence: 99%

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An Accurate Mixed-mode Delamination Failure Criterion for Laminated Fibrous Composites Requiring Limited Experimental Input

Davidson

Zhao

2006

Journal of Composite Materials

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“…Then the specimens were precracked in an opening mode of 4-5 mm. The effect of precracking mode on the initiation toughness was investigated by Davidson et al [30], Polaha et al [31], and de Morais et al [32]. They have found that in the case of mode-I precracking, the toughness may be expected to be lower in comparison with the mode-II precracking.…”

Section: Experiments and Data Reductionmentioning

confidence: 99%

“…This research work was supported by the fund OTKA T037324. We wish to thank Barry D. Davidson for providing [29][30][31], Alfredo Balaco´de Morais for [7,32], and Pizhong Qiao for [14]. The first author is grateful to his father for manufacturing the experimental tools.…”

Section: Acknowledgmentsmentioning

confidence: 99%

Mode-II Fracture in E-glass-polyester Composite

Szekrényes

2005

Journal of Composite Materials

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In this work a novel beam analysis of the end-loaded split (ELS) and over-notched flexure (ONF) specimens are presented. New compliance and strain energy release rate equations are developed incorporating crack tip deformation and transverse shear analysis. The Saint Venant effect at the clamped end of the ELS specimen is also considered. Unidirectional glass-polyester specimens are manufactured and experimental (initiation and propagation) tests are performed to confirm the theoretical models. The experimental data is evaluated by means of four reduction techniques: the exact beam theory, virtual crack closure technique, compliance calibration method, and direct beam theory. It is shown that the results by the four methods agree quite closely; however, the compliance calibration method is not recommended for initiation data reduction in the case of the ONF specimen. The ELS specimens suffer from relatively large displacements. Thus, propagation tests are not possible to be performed. The ONF test seems to be a better tool to evaluate the mode-II toughness of composite materials with low flexural modulus.

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Beam and finite element analysis of quasi-unidirectional composite SLB and ELS specimens

Szekrényes

2004

Composites Science and Technology

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Influence of the Mode Mix of Precracking on the Delamination Toughness of Laminated Composites

Cited by 10 publications

References 11 publications

An Accurate Mixed-mode Delamination Failure Criterion for Laminated Fibrous Composites Requiring Limited Experimental Input

An Accurate Mixed-mode Delamination Failure Criterion for Laminated Fibrous Composites Requiring Limited Experimental Input

Mode-II Fracture in E-glass-polyester Composite

Beam and finite element analysis of quasi-unidirectional composite SLB and ELS specimens

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