Title: MULTIAXIAL OUT-OF-AUTOCLAVE FORMING COMPARISON OF CONTINUOUS AND STRETCH BROKEN CARBON FIBER PREPREG LAMINATES
Authors: Yoni Shchemelinin, Jared W. Nelson, Cecily Ryan , Dilpreet Bajwa, Doug Cairns, Chris Ridgard, Roberta Amendola
Abstract: Carbon fiber reinforced polymers (CFRPs) are a class of materials characterized by high strength-to-failure, corrosion and chemical resistances, and low densities. For these properties, CFRPs are often utilized in high performance applications and industries, such as automotive and aerospace. Using discontinuous fibers as chopped fibers allow for high formability of parts, but at the cost of strength of the material. The low strain-to-failure of continuous fibers creates a strong material, but with limited formability. Stretch broken carbon fiber (SBCF) breaks aligned fibers at randomly distributed natural flaw points to create a material that seeks to bridge the gap between the two styles of CFRPs, combining the formability of discontinuous chopped fiber and the strength of aligned continuous fiber. Prior research into hydraulic bulge out-of-plane multiaxial stress forming demonstrated results showing higher formability of Hexcel IM-7 SBCF / Huntsman RDM 2019-053 resin prepreg laminates compared to IM-7 / RDM 2019-053 continuous fiber laminates. Additional testing using a dome-Erichsen derived test assembly introduced tool-sample interactions, with initial results further showing greater formability in SBCF. With minor modifications being made to the testing assembly, continuous and SBCF prepreg out-of-autoclave formability was again tested, this time using continuous IM-7 / Solvay 977-3 resin and comparing it to Montana State University (MSU), Bozeman, developed BC2 SBCF / 977-3. With both samples were deformed to the point of sample failure, with the SBCF material demonstrating greater formability characteristics than continuous fiber.
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Conference: SAMPE 2023
Publication Date: 2023/04/17
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