title: The use of non-collinear mixing for nonlinear ultrasonic detection of plasticity and fatigue.
abstract: This letter reports on the application of the non-collinear mixing technique to the ultrasonic measurement of material nonlinearity to assess plasticity and fatigue damage. Non-collinear mixing is potentially more attractive for assessing material state than other nonlinear ultrasonic techniques because system nonlinearities can be both independently measured and largely eliminated. Here, measurements made on a sample after plastic deformation and on a sample subjected to low-cycle fatigue show that the non-collinear technique is indeed capable of measuring changes in both, and is therefore a viable inspection technique for these types of material degradation.
authors.forename: Anthony J
authors.initials: AJ
authors.lastname: Croxford
authors.forename: Paul D
authors.initials: PD
authors.lastname: Wilcox
authors.forename: Bruce W
authors.initials: BW
authors.lastname: Drinkwater
authors.forename: Peter B
authors.initials: PB
authors.lastname: Nagy
mesh_terms: D000162:Acoustics / Q000295:instrumentation; D000497:Alloys; D000535:Aluminum; D004548:Elasticity; D019544:Equipment Failure Analysis / Q000295:instrumentation / Q000379:methods*; D008962:Models, Theoretical; D017711:Nonlinear Dynamics; D014159:Transducers; D014465:Ultrasonics
chemical_list: D000497:Alloys; D000535:Aluminum