EVALUATION OF SHEAR LOADED MECHANICAL JOINT IN 3D WOVEN SANDWICH COMPOSITE WITH POLYURETHANE FOAM ADDITION

• Main Author: Raditya Pradipa, Muhammad
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/84332
• Institution: Institut Teknologi Bandung

3D woven sandwich composites, with their superior delamination resistance compared to other sandwich structures, have the potential to be applied as panels for transportation. In such applications, 3D woven sandwich panels need to be joined using mechanical joints. These joints must be able to withstand shear loading. On the other hand, the addition of polyurethane foam in 3D woven sandwich composites has been proven to improve both shear and compressive strength. Therefore, this study examined the strength of shear loaded mechanical joints in 3D woven glass fiber-polyester sandwich composites with the addition of polyurethane foam. The stabilized single lap shear-out method was used to test the strength of shear loaded mechanical joints in 3D woven glass fiber-polyester sandwich composites with the addition of polyurethane foam, varying the edge distance to hole diameter ratio (e/D), width to hole diameter ratio (W/D), and the use of inserts. Failure modes were visually inspected, and damages in bearing-out failure were observed using a stereo microscope. In 3D woven glass fiber-polyester sandwich composites with the addition of polyurethane foam, it was found that the ultimate load increases with increasing e/D and W/D values due to a change in the failure mode to bearing-out at a minimum e/D of 2 and a minimum W/D of 3. The addition of inserts also increased the offset load, initial peak load, and ultimate load by 33.8%, 48.2%, and 44.4%, respectively. The addition of polyurethane foam did increase initial peak load up to 28,9%, but did not significantly affect the ultimate load in shear loaded mechanical joint.