Non-collinear wave mixing for non-linear ultrasonic detection of physical ageing in PVC

• Published in: NDT & E international : independent nondestructive testing and evaluation Vol. 49; pp. 34 - 39
• Main Authors: Demčenko, A., Akkerman, R., Nagy, P.B., Loendersloot, R.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.07.2012; Elsevier
• Subjects: Acoustical measurements and instrumentation; Acoustics; Aging; Applied sciences; Attenuation; Cross-disciplinary physics: materials science; rheology; Dispersions; Estimates; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Linear acoustics; Materials science; Materials testing; Non-linear ultrasonics; Nondestructive testing; Phase velocity; Physical ageing; Physics; Polymer industry, paints, wood; Polyvinyl chlorides; Properties and testing; PVC; Technology of polymers; Testing and control; Ultrasonic testing; PVC; Non-linear ultrasonics; Physical ageing; Dispersion (wave); Acoustic measurement; Pulse echo method; Nondestructive testing; Ultrasonic waves; Nonlinear acoustics; Laboratory measurement; Wave damping; Longitudinal wave; Velocity dispersion; Test bar; Phase velocity; Wave mixing; Aging; Ultrasonic testing
• ISSN: 0963-8695; 1879-1174
• DOI: 10.1016/j.ndteint.2012.03.005

This work considers the characterization of linear PVC acoustic properties using a linear ultrasonic measurement technique and the non-collinear ultrasonic wave mixing technique for measurement of the physical ageing state in PVC. The immersion pulse-echo measurements were used to evaluate phase velocity dispersion and attenuation of longitudinal waves in PVC test specimens. The suggested non-collinear ultrasonic wave mixing technique measurement technique was verified on measurements of laboratory and field PVC test specimens. The measurement results confirm that the ultrasonic wave mixing technique is suitable to estimate the physical ageing state of PVC.