MATERIAL CHARACTERIZATION AND SIMULATION OF LOW VELOCITY IMPACT WOVEN COMPOSITE PLATES MADE USING THE VARI METHOD

• Main Author: Hadi Widanto, Muhammad
• Format: Theses
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/67571
• Institution: Institut Teknologi Bandung

Composite materials have been widely used because of their advantages over conventional metal materials that have the strength-to-weight ratio, high strength, high stiffness, fatigue resistance, and ease to manufacture in complex shapes. Especially carbon materials widely used in various industries especially aircraft industry, which concern to the weight and strength of the material. Alternative methods in composite manufacturing, one of which is the VARI (Vacuum Assisted Resin Infusion) method, continue to be developed. This method is widely used because it can provide good results at a more affordable cost but has many variables that can affect the results. Composite materials have a weakness that is resistance to receiving impact loads. LVI (Low-Velocity Impact) load can be affected by a structure and causes BVID (Barely Visible Impact Damage) damage which can cause damage and reduce material strength and trigger catastrophic failure. Research on composite woven materials with VARI manufacturing is currently being studied. In this study, the composite specimen was manufactured using the VARI method which then tested the mechanical properties of the material. The results become input parameters in numerical simulations to predict impact damage and dynamic response. The results of the manufacture of laminate with VARI produce volume fraction of 55% with variation width and thickness 1.36% and 4.39% respectively. The mechanical properties generate modulus elasticity and modulus shear in plane is 52.3 GPa and 2.7 GPa respectively, tensile strength and in plane shear strength 604 MPa and 28 MPa respectively, and fracture energy mode I 0.5 N/mm. The simulation results in the identification of interlaminar and intralaminar parameters show results with good correlations compared to experiments. LVI damage prediction simulation with variations in impact energy shows that the higher the impact energy, the greater the delamination damage. The impact energies of 12 Joules, 18 Joules, 24 Joules and 30 Joules respectively show the predicted delamination area of 392.1 ????????2, 514.6 ????????2, 568.6 ????????2, dan 781.7 ????????2.