The use of nonlinear acoustic techniques in solids consists in measuring wave distortion
arising from compliant features such as cracks, soft intergrain bonds and dislocations. As …

A principal advantage of using ambient vibration for seismological investigations is that it is
persistent in time and ubiquitous in space. In contrast to earthquakes or active sources that …

Non-classical nonlinear elasticity in micro-inhomogeneous materials such as rocks and
cracked or granular materials leads to a number of phenomena ranging from hysteresis and …

We probe mechanisms controlling the nonlinear elastodynamic response of intact and
fractured rock under both fluid-saturated and dry conditions. We present the results of …

Nonlinearity of damaged materials is often assumed to be correlated with the cumulative
length of micro-cracks discounting the influence of crack width and roughness. To …

When a longitudinal wave (bulk wave) propagates in elastic solids with randomly distributed
micro-cracks, the acoustic nonlinear behavior including the zero-frequency component and …

In this paper, a third harmonic was used to investigate microstructural changes in Al6061-T6
due to different fatigue cycles and a relationship between fatigue cycle and third order …

Crack closure can cause the underestimation or misdetection of fatigue cracks in ultrasonic
testing (UT). Fatigue-crack closure due to an environmental factor, ie, high temperature, was …

A recent variant of time reversal imaging is employed for reconstructing images of a closed
crack, based on both the fundamental and the second harmonic components of the …

Nonlinear acoustics-based nondestructive evaluation (NDE) techniques have shown great
promise for identification of microstructure and microcracking in a wide spectrum of materials …