Evaluation of carbon fiber/epoxy interfacial strength in transverse fiber bundle composite: Experiment and multiscale failure modeling

Effects of thermal histories on interfacial properties of carbon fiber/polyamide 6 composites: Thickness, modulus, adhesion and shear strength

“…It decreases with decreasing nonisothermal crystallization cooling rate and increasing annealing temperature. This is contradictory to the result that IFSS gives similar trend with TFB on evaluating interface strength in epoxy [31]. Actually, residual PA 6, implying good interfacial bonding, gradually increases on carbon fiber with decreasing cooling rate and increasing annealing temperature as SEM results shown (Fig.…”

“…However, the obtained highest TFB strength is still much less than that of neat matrix. This attributes to that stress concentration often exists on the top surface of carbon fiber, which is believed to prematurely cause crack initiation [13,31]. Then crack propagates at crystal boundaries or weak positions inside of them and leads to the final failure of the composites.…”

“…Recently, a transverse fiber bundle (TFB) test method has been proposed to assess the fiber/matrix interfacial adhesion without manufacturing composite laminates. Additionally, TFB shows a good consistency with traditional micro-mechanical techniques [31]. It has been widely used to evaluate interfacial adhesion strength in fiber reinforced epoxy composites [31,32] and epoxy composites modified by fillers [30,33,34].…”

Modelling of Damage Evolution in Braided Composites: Recent Developments

“…As simple methods to analyses composites failure, the major limitation of the maximum-stress and maximum-strain criteria is that they ignore the interaction between stresses and strains in the composites. Therefore, they were mostly applied to specific constitutive material elements, such as failure of fibre (Mao et al 2013), yarns (Dai and Cunningham, 2016) or pure matrix resin Qi et al 2014).…”

“…FE models for the RUCs were subsequently constructed using solid elements of each set of property according to their locations in the RUC. Based on this approach, a generalized method of cells (GMC) was developed (Qi et al 2014;Bednarcyk et al 2015). GMC considers a periodic repeating unit cell and is limited to four sub-cells (one for fibre and three for matrix).…”