Rolled steel becomes the basic material of production and is widely used in various industries,but there is no dynamic monitoring method for rolled steel damage at present.Tests for the dynamic monitoring damage process of steel Q235 under different tensile rates were conducted by using the acoustic emission technique here.Firstly,the acoustic emission signals,produced in the material’s various mechanic behavior stages of elasticity,yield,strengthening,necking and fracture,respectively were obtained under different tensile rates,and the characteristic parameters were extracted.Then the steel tensile damage process was evaluated using the accumulation history images’ normalized curves of characteristic parameters.It was shown that the accumulation history images’ normalized curves of characteristic parameters can obviously reflect the steel tensile whole evolution process and characteristics of each mechanical behavior stage,and the more obvious sudden increment appears at the endpoint of yield stage with decrease in tensile rate,it can be used as an important turning point between yield stage and strengthening stage.Finally,the generation mechanism and characteristics of acoustic emission signals were summarized for each mechanical behavior stage combining with the stretching mechanics.The results provided a reference for further studying the generation mechanism of acoustic emission signals,the quantitative damage and life prediction in rolled steel’s later stage.
Key words
acoustic emission testing /
rolled steel /
dynamic monitoring /
tensile rates /
damage evaluation
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