Title: IMPROVED MICROBOND TEST FOR CHARACTERIZING CARBON-FIBER EPOXY MATRIX COMPOSITES
Abstract: Fiber reinforced polymer matrix composite materials are growing in automotive applications as a light-weight structural component solution. It is well-known that the level of fiber-matrix adhesion can influence the ultimate mechanical properties and structural performance of a composite. In this study, a finite element analysis (FEA) model was developed to study microdroplet loading conditions in an experimental setup utilized to measure carbon fiber-epoxy matrix interfacial shear strength (IFSS). Good correlation was achieved between model prediction and experimentally observed failures due to micro-droplet size effect. Microbond testing parameters such as droplet size, test blade geometry and separation gap were also studied to understand their effects on the data scatter in the microbond test. The study suggests that one source of data uncertainty can be reduced in the microbond test utilizing a blade design with large radius by prescreening micro-droplets of certain sizes for testing. These findings may help open up a new avenue for improving the microbond test technique to reduce test data scatter from test fixture design point of view.
Authors: Liangkai Ma and Richard Baumer
Conference: CAMX 2017 –Orlando