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Experimental results showed homogeneous 100keV-class low voltage electron beam irradiation (HLEBI) prior to lamination assembly (our new method) often improved the Charpy impact values (auc) 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 auc values at each Pf of CFRP/ABS/CFRP laminated by both high-strength and light structural CFRP plies and ABS core separately irradiated from 0.04 to 0.30MGy-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 0.43MGy HLEBI applied to the CFRP sheets and ABS core before lamination assembly reduced the lowest impact value at Pf = 0( as) calculated by 3-parameter Weibull equation, the low dose of 0.04MGy-HLEBI before lamination assembly apparently boosted the as almost 3 times, ³200%, over the untreated samples from 15 to 44kJm ¹2 . Moreover, applying the low dose of 0.04MGy-HLEBI before instead of after lamination apparently improved the as 76% from 25 to 44kJm ¹2 . Furthermore, applying the medium doses of 0.13MGy or 0.22MGy HLEBI before rather than after lamination appeared to improve the as remarkably from 0 to 40, and 0 to 42kJm 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. [doi:10.2320/matertrans.MBW201209]

materials transactions

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