Paper presented at the 8th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Mauritius, 11-13 July, 2011.
Acoustic emission (AE) technique is widely used for
studying deformation and fracture behaviour of materials. An
acoustic emission is the elastic energy that is spontaneously
released by materials when they undergo deformation. In this
study, an attempt has been made to investigate the AE signal
generated during tensile test of mild steel plate (ASTM A-370
standard) with 6 mm thickness at room temperature, after that
the generated AE signal was compared to the conventional
tensile result to get their correlation. AE monitoring was
carried out using AE sensor by placing directly on the
shoulder of the specimens. The AE signal output from the
sensor recorded for every second using the computer system
with the LabView
TM
software. The result shows that the AE
signal generated from all specimens is rapidly increases in the
elastic region. Meanwhile, in the yield region AE signal shows
the maximum value and after that AE signal decreased
exponentially with the plastic deformation. Then, the
generated of AE signal is low and achieved nearly the ultimate
strength and after that it was low or nearly zero. It is
concluded that the initial of plasticity, particularly at or n ear
the yield stress contribute to the highest level of AE observed
on a tensile curve.
