The next speaker in our student seminar series will be Scott Audette. Scott will be giving a talk titled “Mechanical properties of aerospace composite parts made from stitched multilayer 3D carbon fibre preforms”.
Where: CBY B205
Date: Wednesday April 30th, 2014
The abstract of the talk is given below. Hope to see you all there!
Mechanical properties of aerospace composite parts made from stitched multilayer 3D carbon fibre preforms
Candidate: Scott Audette
Supervisor: Dr. Francois Robitaille
Producing composite parts using low-cost processes such as resin transfer moulding (RTM) has received much interest in the aerospace industry. RTM manufactured components require near net shape preforms which closely fit mould cavities. To reduce labour costs associated with composite production, automated preforming processes must be utilized. However, obtaining reproducible high quality preforms is required for manufacturing consistent high quality parts. Stitched multilayer 3D non crimp fabric preforms are well suited for automation and an investigation into quality and performance of components manufactured from these preforms is required. This work provides an initial evaluation of quality and mechanical properties of components made from stitched multilayer 3D non crimp fabric preforms using RTM. Similar sized flat plates of varying fibre volume fractions were manufactured to evaluate flexural modulus and strength, short beam strength and drop weight impact resistance of the material. Also, integral reinforced panels (IRPs) featuring a reinforcing section joined to a flat plate of varying laminating sequences were manufactured to evaluate debonding strength between sections. Optical microscopy was performed on component samples to determine quality based on void content and was found to be within acceptable limits for production composites. Flexural modulus was comparable to theoretical expected values, however flexural strength was limited by the presence of transverse stitches. Short beam strength results showed high consistency between specimens and performed well against comparable data. Impact specimens showed consistency among specimens, with reasonable damage resistance. Determining debonding strength proved difficult as different failure modes were observed between IRPs, however, initial baseline values were acquired.