Effects of elevated loading rates on mode I fracture of composite laminates using a modified wedge-insert fracture method

Thorsson, Solver I.; Waas, Anthony M.; Schaefer, Joseph; Justusson, Brian; Liguore, Salvatore L.

doi:10.1016/j.compscitech.2017.12.018

Cited by 30 publications

(14 citation statements)

References 17 publications

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“…More drops from the average propagation fracture toughness are observed in high rate tests due to the longer crack jumps and related load falls. This observation which supports the rate dependency of fiber bridging, reported by Thorsson et al [11], may dispute the generality of the claim that the presence of even small amounts of fiber bridging makes it difficult to observe any clear rate sensitivity in G IC of unidirectional composites as asserted in the literature [9,18,19]. In other words, these results clearly show that although fiber bridging dominates the stable delamination growth process, its extent is evidently ratedependent and decreases at high strain rates.…”

Section: R-curve Analysissupporting

confidence: 47%

“…On the other hand, in some rate dependency studies of delamination in CFRPs [9,18,19], it was claimed that fiber bridging can obscure the rate dependency of fracture toughness. Nonetheless, the reduced delamination resistance at elevated rates found in [11] was ascribed to a lower extent of fiber bridging. No explanation of the contribution of fiber bridging and its interaction with the loading rate in the delamination of glass/epoxy composite was delivered in reference [15].…”

Section: Introductionmentioning

confidence: 93%

“…Notwithstanding the number of previous researches on the rate dependency analysis of delamination in carbon fiber reinforced plastics (CFRPs), the available experimental data are rather controversial and there is no general agreement on the loading rate effects. Whereas a number of researchers reported an increase in G IC with loading rate [3,6,12], some others found reduced fracture resistance at increased loading rates [4,7,9,11]. In contrast, no significant loading-rate dependency of fracture toughness was observed in a few different research works [13,14].…”

Section: Introductionmentioning

confidence: 95%

“…In a number of previous research works concerning the rate dependency of G IC , the results were expressed in correlation with the local opening rate at the crack tip [4,5,11] which differs from the applied far-field loading rate and does not remain constant during the crack propagation. The crack tip opening rate seems to be the most appropriate measure for rate dependency analysis of delamination growth [1].…”

Section: The Crack Tip Rate Analysismentioning

confidence: 99%

“…Although no standard test procedure is introduced for dynamic loadings up to now, the DCB configuration has been the most common test set-up for the rate dependency examination of G IC at intermediate rates of loading [3][4][5][6][7][8][9]. This configuration has even been modified for further studies at higher loading rates [10,11]. Notwithstanding the number of previous researches on the rate dependency analysis of delamination in carbon fiber reinforced plastics (CFRPs), the available experimental data are rather controversial and there is no general agreement on the loading rate effects.…”

Section: Introductionmentioning

confidence: 99%

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Loading rate effects on mode-I delamination in glass/epoxy and glass/CNF/epoxy laminated composites

Ekhtiyari

Shokrieh

Alderliesten

2020

Engineering Fracture Mechanics

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The main objective of the present study is to assess the loading rate effects on mode-I delamination growth in glass/epoxy laminated composites. Furthermore, hybrid reinforcement of these composites by incorporating carbon nanofibers (CNFs) was followed to enhance the interlaminar fracture resistance and affect its loading rate sensitivity. Experiments on DCB specimens made of glass/epoxy and glass/CNF/epoxy laminated composites were conducted by varying the loading rate from standard quasi-static testing up to 200 mm/sec crosshead speed in a servo-hydraulic test machine. More than 21% decrease was observed in the propagation fracture toughness of the glass/epoxy samples due to loading rate elevation in the studied range. Moreover, the results of the present study clearly show the benefits of CNF modification, not only in enhancing the fracture toughness but also in reducing the loading rate dependency. Adding CNFs to glass/epoxy composites caused 32.8% and 13.5% increase in the quasi-static values of the initiation-and propagation-interlaminar fracture toughness (G IC), respectively. Also, owing to CNF incorporation, the maximum drop in the propagation fracture toughness at elevated loading rates was decreased to 8%. Fractography inspections were performed to provide an in-depth explanation for the observed loading rate effects and the advantages of CNF reinforcement.

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Section: R-curve Analysissupporting

confidence: 47%

Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 95%

Section: The Crack Tip Rate Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Loading rate effects on mode-I delamination in glass/epoxy and glass/CNF/epoxy laminated composites

Ekhtiyari

Shokrieh

Alderliesten

2020

Engineering Fracture Mechanics

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Temperature‐dependent interlaminar behavior of unidirectional composite laminates: Property determination and mechanism analysis

Cao

Meng

et al. 2021

Polymer Composites

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Delamination damage is a critical concern for composites-especially for aircraft structures-considering their complex service conditions, which include extreme temperatures and impact threats. This study considers the effect of temperature (À20 C to 110 C) on the mode-I interlaminar failure behavior for unidirectional carbon/epoxy composite laminates, through a series of experiments.A simple double compliances method (DCM) without the measurement of crack length was employed to determine mode I interlaminar fracture toughness, and the accuracy of DCM at different temperatures was validated by comparing the results obtained from DCM with those calculated using ASTM methods. The comparison indicates that fracture toughness values determined from DCM

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High Strain Rate Response of Adhesively Bonded Fiber-Reinforced Composite Joints: A Computational Study to Guide Experimental Design

Ravindran

Sockalingam

Kidane

et al. 2018

Dynamic Behavior of Materials, Volume 1

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Adhesively bonded carbon fiber-reinforced epoxy composite laminates are widely used in aerospace applications. During a high energy impact event, these laminates are often subjected to high strain rate loading. However, the influence of high strain rate loading on the response of these composite joints is not well understood. Computational finite element (FE) modeling and simulations are conducted to guide the design of high strain rate experiments. Two different experimental designs based on split Hopkinson bar were numerically modeled to simulate Mode I and Mode II types loading in the composite. In addition, the computational approach adopted in this study helps in understanding the high strain rate response of adhesively bonded composite joints subjected to nominally Mode I and Mode II loading. The modeling approach consists of a ply-level 3D FE model, a progressive damage constitutive model for the composite material behavior and a cohesive tie-break contact element for interlaminar delamination.

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Effects of elevated loading rates on mode I fracture of composite laminates using a modified wedge-insert fracture method

Cited by 30 publications

References 17 publications

Loading rate effects on mode-I delamination in glass/epoxy and glass/CNF/epoxy laminated composites

Loading rate effects on mode-I delamination in glass/epoxy and glass/CNF/epoxy laminated composites

Temperature‐dependent interlaminar behavior of unidirectional composite laminates: Property determination and mechanism analysis

High Strain Rate Response of Adhesively Bonded Fiber-Reinforced Composite Joints: A Computational Study to Guide Experimental Design

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