Development of Drop Impact Testing Device for Composite and Its Instrumentation

• Main Author: Hafid, M.
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/23053
• Institution: Institut Teknologi Bandung

Composite has been widely used today. One of the largest field that uses composite is the aircraft industry. The skin of commercial aircraft are made of composite, while the ribs are made of aluminum alloy. The skin and ribs are integrated by rivet, which introduces stress concentration. As an alternate, the integration may be performed by adhesive. However, a lot still needs to be done, including strength evaluation. In this research work, we propose the concept of a drop weight testing rig that will transmit the impact force to fluid inside a cylinder as the load for the speciment. The objective of this research work is to develop a preliminary drop weight test rig and its instrumentation. <br /> <br /> <br /> The preliminary design was adopted from typical drop weight testing rig, in which the drop height is limited by the space availability in the lab. The emphasis is more on the development of the proper instrumentation and the relationship between the drop weight impact mechanism and the absorption by the fluid. The measured parameter are pressure in the fluid and fluid wave velocity. Based on the acquired data, the real drop impact tester will be designed and constructed. <br /> <br /> <br /> Pressure measurement is conducted using strain-gage based pressure transducer, while fluid wave velocity is measured indirectly through the strain changes in two different location in the circumferential direction of the cylinder containing the fluid. Measurement result shows that at 1,5 m height, impact pressure of 0,33 MPa and wave velocity of 208 m/s are obtained. These results will be processed in constructing the real drop impact tester. <br />