Abstract
A microcrack localization method based on a static component (SC) induced by a primary A0 Lamb wave is proposed. Based on the bilinear stress-strain constitutive model, a two-dimensional finite element model is built to investigate the interaction between microcracks and Lamb waves. The A0 Lamb wave at low frequency is selected to be the primary Lamb wave, which is beneficial to microcracks localization. Based on the time of flight of the generated SC pulse, an indicator named normalized amplitude index is defined for finding the location and number of microcracks. Simulation results show that one or multiple microcracks can be effectively located.
Highlights
Acoustic nonlinear response has been a promising and widely used means for interrogating the microdamage or degradation of materials (Kundu et al, 2018)
It is ascertained that the generated time-domain pulse labeled with “static component (SC)” is the SC pulse radiated by the microcrack in the plate, whose carrier wave is the S0 Lamb wave at zero frequency
We propose the SC based method capable of locating microcracks in a thin plate
Summary
Acoustic nonlinear response has been a promising and widely used means for interrogating the microdamage or degradation of materials (Kundu et al, 2018). Some researchers have been devoted to the investigation of the generation of the SC (i.e., the S0 Lamb wave at zero frequency) in plates with weak elastic nonlinearity. From both theoretical and simulation perspectives, Sun et al (2018) and Wan et al (2018) both demonstrated that the cumulative growth effect of the generated SC can occur even under the group velocity mismatching
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