Noncollinear wave mixing for measurement of dynamic processes in polymers: Physical ageing in thermoplastics and epoxy cure

Ultrasonic measurements of undamaged concrete layer thickness in a deteriorated concrete structure

“…However, it is difficult to implement nonlinear ultrasonics measurements based on the harmonic generation due to various parasitic nonlinearities which distort the received harmonics. Wave mixing techniques can be used to overcome these distortions, but it requires a more sophisticated and complex acoustic configuration for the experiments [22,23].…”

Analytical and numerical modeling of non-collinear shear wave mixing at an imperfect interface

“…Then, the weak perturbation produced by the nonlinear interfacial compliance can be directly calculated from these normal and tangential stress components using Eqs. (3). Following the simple rules of system rotated xy coordinate system produces the following normal and shear stress components…”

“…Non-collinear shear wave mixing has been reported to exhibit potential for assessing the excess nonlinearity caused by both bulk material degradation [1][2][3][4] and interface imperfections between solids [5][6][7][8]. When this technique is used to assess bulk nonlinearity, certain phase-matching resonance conditions must be satisfied so that nonlinear mixing of the two non-collinear shear waves can generate a third longitudinal wave with frequency and wave vector equal to the sum of the frequencies and wave vectors of the two interacting shear waves [9][10][11][12].…”

Solid state self-healing system: Effects of using PDGEBA, PVC and PVA as linear healing agents

“…The reason for this decreased recovery is due to the possibility of aging [17][18][19], and will be explored in further research. Based on the results obtained, it was shown that PVC and PVA have a limited effect on healing efficiency compared to PDGEBA.…”