Analysis of Compressive Deformation Behaviors of Aluminum Alloy Using a Split Hopkins Pressure Bar Test with an Acoustic Emission Technique

In this study, the compressive deformation behaviors of aluminum alloy under high strain rates were investigated by means of a Shb test. An acoustic emission (A E) technique was also employed to monitor the signals detected from the deformation during the entire impact by using an A E sensor connected to the specimen with a waveguide in real time. A E signals were analyzed in terms of AE amplitude, AE energy and peak frequency. The impacted specimen surface and side area were observed after the test to identify the particular features in the AE signal corresponding to the specific types of damage mechanisms. As the strain increased, the AE amplitude and AE energy increased whereas the AE peak frequency decreased. It was elucidated that each AE signal was closely associated with the specific damage mechanism in the material