Acoustic Emission Characteristics and Damage Evolution Model of Steel Strands in Tensile Test

Abstract

This research proposes the acoustic emission technique to dynamically monitor the steel strand damage evolution process. Experiments on acoustic emission characteristics of full-regime steel strand tensile failure were conducted. Acoustic emission characteristic parameters of steel strand damage were obtained. Test results show the acoustic emission characteristic parameter is not apparent before fracture, the acoustic emission signal increases rapidly when approaching critical fracture point, and a big burst signal appears near the yield point. According to the correlation figure of acoustic emission accumulation energy, damage characteristic parameter of steel strand can be expressed through acoustic emission accumulative energy, the damage evolution process and law can be dynamically analyzed, and broken strand numbers and time are easily judged. Based on the monitoring data, the relationship between acoustic emission parameter and damage variables were derived. The steel strand tensile damage evolution equation was defined with acoustic emission accumulative energy relative change, the equation can be expressed using Weibull cumulative distribution function, and its rightness and rationality were verified experimentally.