OPTIMIZATION OF TANKER TRUCK STRUCTURAL PERFORMANCE FOR EXTENDED SERVICE LIFE UNDER DYNAMIC LOADS FROM ROAD ROUGHNESS

• Main Author: Maharani Siswadhi, Tamara
• Format: Theses
• Language: Indonesia
• Subjects: Teknik sipil
• Online Access: https://digilib.itb.ac.id/gdl/view/87170
• Institution: Institut Teknologi Bandung

Loaded vehicles such as trucks are heavy-duty transportation tools used to carry large loads, including liquids, solids, or other goods. As a vital element in the logistics industry, trucks often operate on various types of terrain, including roads with significant irregularities. These road irregularities can affect the structural performance of trucks, particularly the chassis, which serves as the main component in supporting both dynamic and static loads. This study involves static and dynamic simulations to analyze stress distribution and the fatigue life of the chassis. The dynamic load from the fluid inside the tank is modeled using a lump mass approach, while the interaction between the mass and the structure is handled through coupling methods. The analysis is conducted on several road variations, including a combination of smooth and uneven roads. Stress data from the simulation is utilized for fatigue analysis using Gerber and Goodman correction methods, as well as Miner’s Rule, to estimate failure time. The results show that the lump mass approach effectively captures the dynamic response of the fluid without the need for direct fluid modeling, thus improving simulation efficiency. Dynamic simulations reveal that road irregularities have a significant impact on the stress distribution in the truck chassis. Maximum stress tends to increase on roads with higher irregularities, which ultimately accelerates the reduction in the chassis's fatigue life. Fatigue life calculations were conducted using Miner’s Rule, with mean stress corrections based on Gerber and Goodman methods. The findings indicate that the Gerber method provides a more conservative estimation of fatigue failure compared to the Goodman method. Based on the fatigue life calculations, the AISI 4130 material exhibited a relatively short fatigue life, especially on roads with high irregularities. In contrast, the AISI 4340 material, which has a higher ultimate strength, significantly extends the chassis's fatigue life even under harsh operational conditions.