Toughening epoxy syntactic foams with milled carbon fibres: Mechanical properties and toughening mechanisms
Toughening epoxy syntactic foams with milled carbon fibres: Mechanical properties and toughening mechanisms
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DOI：
10.1016/j.matdes.2019.107654
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发表时间：
2019-05-05
影响因子：
8.4
通讯作者：
Taylor, Ambrose C.
中科院分区：
文献类型：
--
作者：
He, Sammy;Carolan, Declan;Taylor, Ambrose C.
在环氧树脂基体中包含中空玻璃微球（GMS）的复合泡沫是用于轻质结构的关键材料，广泛用于海洋和航空航天中作为复合夹层板的芯。它们具有浮力和抗压性，但它们的使用受到脆性的限制。研磨的碳纤维（MCF）用于通过引入能量吸收机制来增加韧性至包含类似于60体积% GMS的泡沫。使用高达40%MCF：GMS的重量比。随着MCF质量比的增加，泡沫的拉伸模量从3.36 GPa增加到5.41 GPa。复合泡沫塑料的拉伸强度随着MCF填充量的降低而降低，但是当添加更多的MCF颗粒时，复合泡沫塑料的拉伸强度恢复，并且第一次解释了负责的机制。复合泡沫塑料的断裂能增加了183%，从182 J/m2增加到516 J/m2，这是由于添加了40%重量比的MCF。韧化机制被确定为裂纹偏转，脱粘和随后的塑性空隙增长，和纤维拔出。因此，MCF的简单且廉价的添加大大增加了复合泡沫塑料的韧性，使得能够生产更轻或更耐损坏的结构。(C)2019作者出版社：Elsevier Ltd
Syntactic foams comprising hollow glass microspheres (GMS) in an epoxy matrix are critical materials for lightweight structures, being extensively used in marine and aerospace as cores for composite sandwich panels. They are buoyant and crush resistant, but their use is limited by their brittleness. Milled carbon fibres (MCF) were used to increase toughness, by introducing energy absorption mechanisms, to foams comprising similar to 60 vol% GMS. Weight ratios of up to 40% MCF: GMS were used. The tensile modulus of the foams increased from 3.36 GPa to 5.41 GPa with the addition of 40% weight ratio of MCF. The tensile strength of the syntactic foam decreased with low loadings of MCF, but then recovers when more MCF particles are added, and the mechanisms responsible are explained for the first time. The fracture energy of the syntactic foam increased by 183%, from 182 J/m(2) to 516 J/m(2), due to the addition of 40% weight ratio of MCF. Toughening mechanisms were identified as crack deflection, debonding and subsequent plastic void growth, and fibre pull-out. Thus, the simple and cheap addition of MCF greatly increases the toughness of the syntactic foams, enabling lighter or more damage-resistant structures to be produced. (C) 2019 The Authors. Published by Elsevier Ltd.