EFFECT OF RESIN RATIO AND ROLLING DIRECTION TO FLATWISE COMPRESSIVE STRENGTH OF SANDWICH COMPOSITE 3D WOVEN FABRIC GLASS FIBER– POLYESTER

• Main Author: Budiman, Handy
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/33865
• Institution: Institut Teknologi Bandung

Sandwich material consists of 2 skins that has high mechanical properties and covers the core that has low mechanical properties. Sandwich material is used for application that needs high specific bending strength like in panel of high speed train, and bus. Composite sandwich 3D woven fabric has good delamination strength but has low flatwise compressive strength like honeycomb sandwich. Mechanical properties of composite material depends on resin ratio. Difference of column structure on warp and weft direction will affect on lamination technique. In this research, the effect of resin ratio and rolling direction to flatwise compressive strength of sandwich composite 3D woven fabric glass fiber – polyester is studied. Sandwich composite is made by hand lay – up method. Physical properties which is studied is thickness, density, and fiber volume fraction. Flatwise compressive strength of composite sandwich is also evaluated. Inspection of core is done by stereo microscope and inspection of impregnation is done by visual test. Sandwich composite is successfully made with resin weight ratio at 1 – 1,5 with maximum flatwise compressive strength of 3,75 MPa. Rolling direction that cause highest flatwise compressive strength is in weft direction at 3,75 MPa. The higher the resin ratio, the stronger flatwise compressive strength of sandwich composite 3D woven fabric with increase of strength from 0,39 – 3,75 MPa because of polyester network formation