Charpy Impact of Sandwich Structural Composites (CFRP/PC/CFRP) of Polycarbonate (PC) Cores Covered with Carbon Fiber Cross Textile Reinforced Epoxy Polymer (CFRP) Thin Sheets as a Function of Temperature

Nishi, Yoshitake; Tsuchikura, Naoya; Nanba, Shinichiro; Yamamoto, Tatsuya; Faudree, Michael C.

doi:10.2320/matertrans.m2011357

Cited by 12 publications

(11 citation statements)

References 19 publications

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“…On the other hand, observed data from HLEBI applied after laminate assembly 4) showed simple bending fracture occurs from the 0.22 to 0.43 MGy-HLEBI doses. Regardless if samples were from the HLEBI applied before or after the laminate assembly, it should be confirmed that the complete bending fractures of ABS core and CFRP sheet with pull-out of carbon fiber from epoxy resin are mostly observed at the impact point in fractured CFRP/ABS/CFRP irradiated with 0.22 and 0.30 MGy at each P f value.…”

Section: Optical Observation Of Fractured Cfrp/abs/cfrpmentioning

confidence: 93%

“…It is noted here the higher dose of 0.43 MGy-HLEBI reduces the a uc values at all experimental fracture probability (P f ), and is tremendously lower than that without HLEBI. Figure 4 shows changes in Charpy impact value (a uc ) at P f of 0.06, 0.50 and 0.94 of CFRP/ABS/CFRP against dose of HLEBI before ( , , ) compared with that from a previous study after lamination 4) ( , , ), respectively. HLEBI from 0.04 to 0.22 MGy-HLEBI before lamination raises the a uc values at mid P f (0.50) of the CFRP/ABS/CFRP.…”

Section: Effects Of Hlebi On Impact Values Of Cfrp/abs/mentioning

confidence: 99%

“…The impact value, a uc of CFRP/ABS/CFRP, 3) which approximately corresponds to that of CFRP composite, 4) is more than two times higher than that of CFRP/PMMA/CFRP. 3) In addition, since the price of CFRP (84,000 Yen/1.0 m © 1.0 m © 2.0 mm at 2012 Feb.) is higher than that of ABS resin (6240 Yen/1.0 m © 1.0 m © 2.0 mm at 2012 Feb.), the sandwich structural composites of CFRP/ABS/CFRP (20,240 Yen/1.0 m © 1.0 m © 2.0 mm at 2012 Feb.) are only 24% that of CFRP, hence practical use is extremely required.…”

Section: Introductionmentioning

confidence: 99%

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Charpy Impact Value of Sandwich Structural (CFRP/ABS/CFRP) Composites Constructed with Carbon Fiber Reinforced Epoxy Polymer (CFRP) and Acrylonitrile Butadiene Styrene (ABS) Sheets Separately Irradiated by Electron Beam Prior to Lamination

2013

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Experimental results showed homogeneous 100 keV-class low voltage electron beam irradiation (HLEBI) prior to lamination assembly (our new method) often improved the Charpy impact values (a uc ) of the sandwich structural CFRP/ABS/CFRP (carbon fiber reinforced epoxy polymer) and (acrylonitrile butadiene styrene) with low volume fraction of carbon fibers for cost reduction and safety. The a uc values at each P f of CFRP/ABS/CFRP laminated by both high-strength and light structural CFRP plies and ABS core separately irradiated from 0.04 to 0.30 MGy-HLEBI before lamination were mostly higher than that without HLEBI. Although carefulness for aircraft parts would be necessary since higher doses of 0.30 and 0.43 MGy HLEBI applied to the CFRP sheets and ABS core before lamination assembly reduced the lowest impact value at P f = 0 (a s ) calculated by 3-parameter Weibull equation, the low dose of 0.04 MGy-HLEBI before lamination assembly apparently boosted the a s almost 3 times, ³200%, over the untreated samples from 15 to 44 kJ m ¹2. Moreover, applying the low dose of 0.04 MGy-HLEBI before instead of after lamination apparently improved the a s 76% from 25 to 44 kJ m ¹2 . Furthermore, applying the medium doses of 0.13 MGy or 0.22 MGy HLEBI before rather than after lamination appeared to improve the a s remarkably from 0 to 40, and 0 to 42 kJ m ¹2, respectively. The new method of applying HLEBI prior to lamination allows for more efficient beam contact to the inner core and its surface permitting deeper areas in thick laminated composites such as CFRP/ABS/CFRP to be treated generating dangling bonds, hence strengthening the bulk materials and the CFRP-ABS interface of the thick laminated CFRP/ABS/CFRP constructed with thin or thick surface sheet and thick core can be expected.

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Section: Optical Observation Of Fractured Cfrp/abs/cfrpmentioning

confidence: 93%

Section: Effects Of Hlebi On Impact Values Of Cfrp/abs/mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Charpy Impact Value of Sandwich Structural (CFRP/ABS/CFRP) Composites Constructed with Carbon Fiber Reinforced Epoxy Polymer (CFRP) and Acrylonitrile Butadiene Styrene (ABS) Sheets Separately Irradiated by Electron Beam Prior to Lamination

2013

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“…[8][9][10] The introduction of highly ductile resins also has a positive effect on the performance of hybrid laminates. [11,12] In the other case, CF/Epoxy laminates are able to act as the main load carrier of hybrid laminates, and CF/ Plastics laminates with higher plasticity are used to improve the destruction process of CF reinforced epoxy/plastics (CF/Epoxy/ Plastics) hybrid laminates. Compared with CF/Epoxy laminates, hybrid laminates exhibit better performance in some specific mechanical properties and even show a synergistic effect between different materials.…”

Section: Introductionmentioning

confidence: 99%

Impact and Flexural Properties Studies on Carbon Fiber Reinforced Epoxy/Polycarbonate Hybrid Laminates with Different Stacking Sequence

et al. 2020

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Carbon fiber (CF) hybrid laminates with excellent mechanical properties have attracted great attention. Herein, CF reinforced epoxy/polycarbonate (CF/Epoxy/ PC) hybrid laminates are fabricated via laser surface processing and hot-pressing technique. Several mechanical tests, including uniaxial tensile, flexural, and impact, are conducted to assess the effect of stacking sequence on the prepared hybrid laminates. In addition, failure behaviors and morphologies are observed to analyze the interaction mechanism between the two laminates. Experimental results indicate that the tensile properties of hybrid laminates conform to the rules of mixture. The best flexural properties and impact peak force are found in Epoxy-PC hybrid laminates. However, due to the transfer phenomenon of flexural point during the impact process, PC-Epoxy hybrid laminates possess the best impact energy absorption. Furthermore, the introduction of CF/PC laminates greatly mitigates the out-of-plane fracture process of CF/Epoxy laminates during a flexural test. However, its in-of-plane fracture area has a further increase during the impact process, which illustrates the synergetic enhancement ability of hybrid laminates.

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“…To test for impact strength, traditionally damage by a hemispherical impactor is initiated as a point force on the center of a square or rectangular specimen ³70 to 150 mm 2 by slow point force, 12,13) drop tower, or projectile. 14,15) Five fracture modes in composite laminates and sandwich panels undergoing point impact have been identified: core crushing, core cracking, delamination in the impacted face sheet, matrix cracking, and fiber breakage in the face sheets.…”

Section: )mentioning

confidence: 99%

Improvement of Low-Temperature Impact Value of Sandwich-Structural (CFRP/ABS/CFRP) Laminate Plies by Homogeneous Low-Energy Electron Beam Irradiation (HLEBI)

et al. 2016

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Experimental results show applying homogeneous low-energy electron beam irradiation (HLEBI) treatment of 0.30 MGy to both sides of sandwich structural CFRP/ABS/CFRP composite constructed of an ABS core between two thin plies of carbon cross textile fiber/epoxy CFRP apparently increased Charpy impact values, a uc at all fracture probabilities, P f at temperatures of 77, 200 and 300 K, within the low temperature range of aircraft operation and below the minimum of reusable launch vehicle operation in space reported as 116 K. At median-P f = 0.50 a uc was increased 98% from 11.4 to 22.5 kJ m ¹2 at low temperature of 77 K, while the HLEBI increased a uc at P f = 0.50 221% and 25% at 200 and 300 K, respectively. Although the lowest statistical impact value calculated by the 3-parameter Weibull equation, a s at P f = 0 (a s ) was reduced in the 200 K samples, a s was improved for the 77 and 300 K samples. The lower a s for the 200 K samples is probably the result of high scatter in the data although the a uc was remarkably improved at all experimental P f . In general, the a uc increased with test temperature. Optical observation shows the HLEBI appears to increase the a uc by preventing brittle shattering of the ABS core in the 77 and 200 K samples, and increasing core ductility in the 300 K samples. Within the outer single CFRP plies the HLEBI strengthens by generating dangling bonds in the epoxy matrix as micro-compressive forces increasing adhesion to the fibers by terminated atoms by Coulomb attractive force. Since calculated HLEBI penetration depth, D th into the sample was less (119 µm) than the 265 µm CFRP ply thickness, it is possible the strengthened plies carried the load protecting the ABS core. It is also possible the highly conductive carbon fibers transferred charge to the ABS core, generating dangling bonds and/or polarizing the ABS polymer strengthening the ABS itself preventing shattering.

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Charpy Impact of Sandwich Structural Composites (CFRP/PC/CFRP) of Polycarbonate (PC) Cores Covered with Carbon Fiber Cross Textile Reinforced Epoxy Polymer (CFRP) Thin Sheets as a Function of Temperature

Cited by 12 publications

References 19 publications

Charpy Impact Value of Sandwich Structural (CFRP/ABS/CFRP) Composites Constructed with Carbon Fiber Reinforced Epoxy Polymer (CFRP) and Acrylonitrile Butadiene Styrene (ABS) Sheets Separately Irradiated by Electron Beam Prior to Lamination

Charpy Impact Value of Sandwich Structural (CFRP/ABS/CFRP) Composites Constructed with Carbon Fiber Reinforced Epoxy Polymer (CFRP) and Acrylonitrile Butadiene Styrene (ABS) Sheets Separately Irradiated by Electron Beam Prior to Lamination

Impact and Flexural Properties Studies on Carbon Fiber Reinforced Epoxy/Polycarbonate Hybrid Laminates with Different Stacking Sequence

Improvement of Low-Temperature Impact Value of Sandwich-Structural (CFRP/ABS/CFRP) Laminate Plies by Homogeneous Low-Energy Electron Beam Irradiation (HLEBI)

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