Loading rate dependency on mode I interlaminar fracture toughness of unidirectional and woven carbon fibre epoxy composites

Zabala, Haritz; Aretxabaleta, L.; Castillo, Gladys; Aurrekoetxea, J.

doi:10.1016/j.compstruct.2014.11.001

Cited by 46 publications

(39 citation statements)

References 26 publications

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“…They have found that lighter impacts generates higher delaminated area, because of the decrease of interlaminar fracture toughness as the impact velocity (and therefore strain rate) increases. Later, the same researchers have found similar conclusions in double cantilever beam test per formed at different rates [42]. It is possible to state that in the case of woven carbon/epoxy laminates, there is no clear consensus about the influence of the impactor mass.…”

Section: Introductionsupporting

confidence: 54%

Experimental study of the impactor mass effect on the low velocity impact of carbon/epoxy woven laminates

Artero-Guerrero

Pernas-Sánchez

López-Puente

et al. 2015

Composite Structures

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In this work, the analysis of the impactor mass effect on the behaviour of carbon/epoxy woven laminates under low velocity impact is carried out. To this end experimental test were performed by means of a drop weigh tower in a range of energies varying from 10 to 110 J, and using three different impactor masses. Two different laminate thicknesses were considered in order to take into account its possible influence. An analysis of the impact tests is performed using the Composite Structure Impact Performance Assessment Program, in order to observe the influence of impactor mass. Once impacted, the laminates were inspected by means of a C Scan (to quantify the delamination extension) and a phased array ultrasonic system (to analyse the failure through the thickness); this non destructive anal ysis will determine the influence of the impactor mass on the laminate failure.

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Section: Introductionsupporting

confidence: 54%

Experimental study of the impactor mass effect on the low velocity impact of carbon/epoxy woven laminates

Artero-Guerrero

Pernas-Sánchez

López-Puente

et al. 2015

Composite Structures

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“…Experiments on double cantilever beam (DCB) specimens were standardized for mode-I interlaminar fracture toughness (G IC ) characterization of fiber-reinforced plastics under quasi-static loads [2]. 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].…”

Section: Introductionmentioning

confidence: 99%

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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“…[20,21,24] In this study, this test serves to determine critical energy release rates from growth of interply cracks. [20,21,24] In this study, this test serves to determine critical energy release rates from growth of interply cracks.…”

Section: Mechanical Testing To Determine Interlaminar Fracture Tougmentioning

confidence: 99%

Mode I interlaminar fracture toughness of carbon‐epoxy coupons with embedded ceramic sensors

et al. 2017

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This study analyses the mechanical and crack growth behavior of woven carbon fiber reinforced plastics (CPRF) with embedded ceramic sensors. The material studied here is 3K-70-P carbon fiber plain weave with EPOLAM 2015® epoxy resin. The composite is manufactured with vacuum bagging procedure. Later on, the composite Mode I interlaminar fracture toughness (G IC ) is calculated by means of double cantilever beam tests (DCB) for two layout configurations [0/90] and [±45] with and without embedded sensors. Results give an initial approach of the fracture behavior of an instrumented composite facing an interlaminar crack. The interlaminar fracture toughness for the instrumented specimens is lower compared to the noninstrumented coupons. The presence of the sensor and its wire connection has a considerable impact on the damage tolerance of the woven composite, where the sensors surroundings seem to be the more likely region to be affected by an interlaminar fracture. K E Y W O R D S carbon fibers, delamination, fractography, fracture toughness F I G U R E 5 Load-displacement curve for [±45] double cantilever beam coupons [Colour figure can be viewed at wileyonlinelibrary.com] Reference With Peak load = 105 N, Peak load = 45 N, With How to cite this article: Torres M, Tellez RA, Hernández H, Camps T. Mode I interlaminar fracture toughness of carbon-epoxy coupons with embedded ceramic sensors.

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Loading rate dependency on mode I interlaminar fracture toughness of unidirectional and woven carbon fibre epoxy composites

Cited by 46 publications

References 26 publications

Experimental study of the impactor mass effect on the low velocity impact of carbon/epoxy woven laminates

Experimental study of the impactor mass effect on the low velocity impact of carbon/epoxy woven laminates

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

Mode I interlaminar fracture toughness of carbon‐epoxy coupons with embedded ceramic sensors

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