Impact Bending Test on Steel at Low Temperatures Using a Split Hopkinson Bar

Abstract

By using a split Hopkinson bar type apparatus, impact bending tests of 0.45% carbon steel were carried out on U-notched annealed specimens and quenched-and-tempered ones. The load-deflection curves were determine easily by the tests. The temperature dependences of the yield load, the maximum load, the fracture load and the absorbed energy were determined within the temperature range from room temperature to -195°C. The absorbed energies agree fairly well with the ordinary Charpy values at these temperatures for both specimens. Repeated impact bending tests with a short striker bar were also carried out and it has become clear that the crack initiates at or slightly beyond the maximum load.