NUMERICAL ANALYSIS OF CFRP PLATE STRUCTURE BEHAVIOR EFFECT BY EXPLOSION IMPACT LOAD WITH LS DYNA.

• Main Author: Oki Rialto, Rully
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/35928
• Institution: Institut Teknologi Bandung

The advantages of lightweight and strong CRFP (carbon fiber reinforced polymer) material are the main factors developed in various field applications, including their use in structures that require explosive resistance. In carrying out the process of developing CRFP plates that are resistant to explosion loads, studies need to be conducted involving testing and simulation. In this study CRFP plate behavior due to explosive loads was carried out using LS DYNA software. The analysis carried out was comparing two loading model approaches, ConWep based (LBE) with SPH (smooth particles hydrodynamic) based on the deflection that occurred. The deflection data taken is the midpoint deflection, because it is the largest deflection price. CRFP plate modeling uses the MAT_54 type which is a model of advanced composite material that allows failure due to maximum stress (Chang / Chang) or maximum strain. In the ConWep modeling approach the pressure calculation uses empirical results as a function of distance and TNT mass however in the SPH method the rate of pressure is the result of a fractional particle dynamic simulation of the SPH node which models the explosion gas TNT. The calculation of pressure that occurs is a function of the energy content (E0), velocity of detonation (VOD) and the density of the gas. In addition to the TNT model, in SPH air modeling is needed to provide more accurate results. Because the simulation is dynamic, it is necessary to select the time step rate. The value of time step 0.05 provides nears to accurate results. The simulation results provide a maximum deflection 18.46 mm for the SPH method and 9.02 mm for the LBE method. In the final condition of the simulation, a strain is 0.06% at the plastic area. The comparison between the price of pressure from the SPH and LBE models with the reference shows a difference of less than 5%. Comparison of deflection divergence between test results and simulations gives a 2.8% in the SPH method and 52.2% with the LBE method.