DESIGN OPTIMIZATION OF TORSIONAL CRUSHING BEHAVIOUR OF FIBER METAL LAMINATE THIN-WALLED PRISMATIC STRUCTURES

• Main Author: Yassar, Naufal
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/71391
• Institution: Institut Teknologi Bandung

Thin-walled structures have been extensively studied regarding their behavior under compressive loading, bending, and several studies regarding torsional loading. The application of fiber metal laminate (FML) material to thin-walled structures is proven to improve the performance of thin-walled structures in terms of crashworthiness. The behavior of thin-walled structures made of FML subjected to torsional crushing load was investigated numerically in this study. Two crashworthiness parameters were observed, namely specific initial torsional crushing moment (STi) and specific energy absorption (SEA). Design optimization was carried out using the design for six sigma (DFSS) Taguchi method with the L18 orthogonal array to obtain the combination of parameters that produces the highest STi and SEA values. Several variations of structure parameters, namely metal layer material, fiber reinforced polymer (FRP) material, FML arrangement order, fiber orientation, metal layer thickness, number of fiber layers, cross-sectional shape, and adhesive between the metal layer and fiber layer were determined as control factors. Optimization results show the use of structure with an octagonal cross-sectional shape, Al2024-T3 material, T700/epoxy carbon material, M/F/F/F/M arrangement order, fiber orientation of [+45o/-45o], metal layer thickness of 0.6 mm, the number of FRP layers is 6 pieces, and 105/206 epoxy adhesive can produce the highest STi values. While the optimum parameters for SEA have several differences from the STi optimum parameters, namely Ti-6Al-4V material, fiber orientation of [0o/90o], and epoxy/GNP adhesive. The effect of each parameter on STi and SEA values was evaluated using analysis of variance (ANOVA). Fiber orientation contributed the most to the STi value, which is 34.38%. Meanwhile, the biggest contribution to the SEA value is the order of FML preparation, which is 31.27%.