Laser-Air Hybrid Ultrasonic Technique (LAHUT) combines laser generation with air-coupled detection of ultrasound. The technique is non-contact and has the characteristic of operating from remote distances. Acoustic wave laser-generation apparatus can be meters away from the interrogated surface while air-coupled detection standoff can be on the order of several centimeters. The technique has th...

Abstract This study proposes a method for modelling the flow interaction of multiple moving objects where field variables are communicated between separate computational domains. Instead using conventional approach with single fixed domain covering whole field, this advances (MCD) in which itself moves line motions an object inside. The domains created around each move independently, and fields...

A model is presented herein for predicting the evolution of numerous cracks on multiple length scales, the objective of such a model being to develop the capability to predict failure of structural components to perform their intended tasks. Such a capability would then be useful as a predictive tool for designing structural components so as not to fail, but rather to succeed in performing thei...

The mechanism of spoiling failure in rolling contact is modeled by an elastic halfplane with a subsurface crack parallel to the surface, loaded by a compressive normal force which moves over the surface. Coulomb friction at the crack faces reduces the Mode II Stress Intensity Factors and results in a number of historydependent slip-stick configurations. The formulation used to study these invol...