Abstract
Early detection of crack initiation and propagation in structural steel is very important for avoiding enormous industrial and plant accidents due to the occurrence of permanent damage in the material. Acoustic emission (AE) technique is an influential tool for observing the transient modes of this damage characteristics. Elastic wave propagation for crack formation and propagation inside the material generates identifiable AE parameters. However, some dummy like AE features because of the rubbing operations among pre-existing microcracks in material and or unstable loading features of the material cause undue artifacts in early evaluation of crack formation and propagation. Careful evaluation of some frequency distribution characteristics along with other influential features comprise the AE technique in early-detectable of cracking. In the present study, the failure of steel plate caused by cracks and micro-cracks has been investigated sequentially by AE technique. AE event analysis along with microstructural evaluation show the reasonable results as well.
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