| Abstrakt: |
Road crashed barriers are invented to redirect errant vehicles safely upon collisions. Numerous studies have been done to improve its crashworthiness. In current research, the use of honeycomb panel is suggested as an additional shock absorber. The main objective of this research is to determine the best configuration of the newly proposed additional panel. ANSYS explicit software is utilized for simulations. Desired parameters; length of honeycomb panel (L0i), and thickness of honeycomb panel (H0i), are varied accordingly. The variations are based on a ratio of 1.0, 2.0, 3.0, 4.0 and 5.0. These parametric ratios are related to the ratio between the guardrail to the honeycomb panel. In this case, the guardrail has constant length and effective thickness of 2000 mm and 82.6 mm. Square-shaped cells of size 12.7 mm with thickness of 0.8 mm will be used. All configurations are tested through an impact simulation with an initial velocity of 60 km/h. Their respective displacement, velocity and acceleration will be collected to perform desired numerical analysis; Force (F), Specific Force (SF), Energy Absorption (EA), and Specific Energy Absorption (SEA). Different deformation mechanisms and equivalent (Von-Mises) stress distributions suggest its nature to resist the impact, prior to a failure. Some parameters and components are optimised to reduce computational burden. The use of additional rectangular honeycomb panel suggested more energy can be absorbed. Overall, it has been concluded that honeycomb's panel length of 1993.9 mm (parametric value of 1) and height of 82.60 mm offers the best configuration in having the best performance amongst all other configurations. [ABSTRACT FROM AUTHOR] |
