RESPONS STRUKTUR SANDWICH SILINDER MODEL HEKSAGON MENYERUPAI BAMBU TERHADAP BEBAN TEKAN KUASI-STATIK

• Main Author: Ufaira Sashikirana, Khansa
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/62013
• Institution: Institut Teknologi Bandung

Biomimetic or biomimicry is defined as a discipline that applies, mimics or adapts principles of biological organisms in design and new material and technology development. Inspiration to design such structure or technology could arise from various references, one of them includes adaptation from the internal structure of plants for structural weight optimization. In this research, analysis conducted on bamboo biomimetic structure, aiming to obtain load versus displacement curves using numerical simulation, compare it to the experiment results and determine the load resisted against its mass for further comparison to other models. The reconstruction of bamboo structure made to mimic the bamboo skin, with vascular bundle shape approximated by hexagonal shape and sandwiched between inner and outer walls. The numerical simulation carried using ABAQUS and 3D-printed PLA material was a quasi-static compression test to match the experiment. The model reconstructed in ABAQUS then assembled and applied with material and section properties, interaction, and mesh. For this research, 15 simulations have been done on the reconstructed bamboo model with parameter variations. Material parameters change in simulation such as elastic modulus, yield stress, plastic strain, ductile damage, and damage evolution influenced structural response characteristics. Simulation 15 has the closest value of maximum load with the experiment, but the simulation stopped earlier at 6.93 mm because it did not converge. The parameters used on said simulation applied on cylinder plate and sandwich cylinder type I with simpler designs. The simulation on the cylinder plate model was able to achieve convergence, while on the sandwich cylinder it diverged at 37.72 mm so it was concluded that the more complex the model, the faster it is to diverge. It is likely to be caused by the locking phenomenon or condition of excessive stiffness on numerical analysis of complex structures and anisotropic properties of material manufactured using 3D printing, resulting in difficulty for predicting non-linear response by simulation. The comparison of load resisted and mass among the reconstructed bamboo model, cylinder plate and cylinder sandwich has given the conclusion that the reconstructed bamboo model has the most load resistance and the heaviest mass, with the value of 59,306 N and 0.14 kg respectively.