THE BEHAVIOUR OF BRASS UNDER HIGH LOADING RATE TENSILE TEST (102—104/s)

• Main Author: Puspitasari, Rr.Poppy
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/38362
• Institution: Institut Teknologi Bandung

High loading rate tensile test is a method for understanding mechanical behaviour of material under strain rate 102-104/s. This method was developed by John Hopkinson (1872) and Bertram Hopkinson (1914). They used two elastic bar known as Split Hopkinson Pressure Bar (SHPB). SHPB method is tedious and because of that, this thesis tried to modify impact testing machine in order to simplify the SHPB method. The purpose of this method is to study ductile to brittle phenomena on brass under low loading rate tensile test and high loading rate tensile test. This research used two kind of specimen, one is unnotched specimen and the second is notched specimen. The result shows that the range of high strain rate is 0.5 x 103 –1.9 x 103 /s for unnotched specimen and 1.9 x 103 – 8.2 x 103 /s for notched specimen. Elongation value increase significantly on high strain rate but elongation value at low strain rate show lower value than at high strain rate. It means that high energy and strain rate do not cause ductile to brittle phenomena but the opposite. For both specimen, the fractures were of brittle cleavage fractures.