| Summary: | 碩士 === 國立中山大學 === 機械與機電工程學系研究所 === 101 === This paper aims to investigate the failure analysis of Ti/APC-2 anisotropic composite laminates after high-velocity impact. The ANSYS/LS-DYNA software was used to simulate the high-velocity impact process. Then, compare the theoretical calculations with the numerical simulation results of ballistic limit in the Ti/APC-2 laminates to confirm the reliability of simulation. The analysis includes failure mode of laminates, projectile velocity and energy changes, the internal energy of laminate, and the changes by using different lay-ups or material.
The main work can be divided into two parts: the first part is presentation of ANSYS/LS-DYNA simulation processes and results. High-velocity impact will be acted on the simulation samples, which are 3, 5, 9, 17, and 25 lay-ups laminates with 100, 200, 500, 1000, 1500, and 2000 m/s projectile velocities, respectively. Second, the ballistic limit was obtained by theoretical calculation. Then, the simulations results were compared and discussed.
By comparing the theoretical calculations with the simulation results of ballistic limit in the Ti/APC-2 laminates, the errors of simulation results are quite acceptable, i.e., the reliability of simulation is in good agreement. If the initial velocity of projectile is close to ballistic limit, the influence of structural damage, internal energy absorption, and changes of projectile velocity and energy are more obvious. After impact, absorption of internal energy of Ti sheet is much larger than APC-2, and the backsheet of Ti absorb more energy than facesheet of Ti usually. Under the same material composition, the more stratified laminates possess better impact resistance. Replace a portion of Ti sheets with Al sheets, the impact resistance do not increase.
|
|---|
