OPTIMASI STRUKTUR SUBCARGO PESAWAT BERBASIS MATERIAL KOMPOSIT PADA KASUS BIAXIAL LOADING

• Main Author: Yanto Simanihuruk, Indra
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/62061
• Institution: Institut Teknologi Bandung

Heavy aviation traffic demands great attention to the aircraft airworthiness where the aircraft structures must be safe and meet the standards of crashworthiness so that fatal injuries can be avoided in the event of an accident. One of the most important structures to reduce the risk of injury to passengers during an accident is the main energy-absorbing structure of aircraft subcargo, namely the crash absorber, which is studied in the case of biaxial loading in this study. Composites are used as the base material in this research since they have proven to be quite good for crash-relevant structures. The numerical modeling in this study is done with non-linear finite element analysis using single-layer approach and Chang-Chang failure material model. Numerical parameters of the material model and mesh size are first analyzed for their influences on the simulation results and then calibrated so that the results obtained were quite relevant to the available experimental data. Optimization of sub-cargo absorber structure is performed by the Taguchi method with spesific energy absorption (SEA) at load angle 30? as the response parameter. With control factors such as cross-section, number of plies, fiber orientation, and length, it is found that structure with Circular Sinusoidal section, 24 plies (3.24 mm), [90?/0?]s lay-up and 150 mm length has the highest SEA at 30? that is 43.6 J/g. Furthermore, the average specific energy absorption under multiple oblique loading (SEA?) owned by this structure is also quite high i.e. 51.7 J/g. This result is higher than SEA? owned by structures with the same cross-section and length but with quasi-isotropic lay-up.