... A methodology for determining the degree of aging of hot-mix asphalt (HMA) is presented. The evaluation of aging involves relating the wave propagation velocities to the elastic modulus of the mixture, before and after aging. The nondestructive nature of the methodology and its high degree...

... The experimental procedure defines a drop-ball arrangement, able to generate Rayleigh waves in flight that propagated in a centrifuged soil mass, in order to investigate the very difficult problems of surface wave propagation in a half-space that contains barriers, trenches, obstacles or a soft...

... Computations of the dispersion of waves propagating through a layered pavement structure are fundamental to the determination of moduli for individual layers by what is called the wave propagation method. Processing field data using the Fourier transform is shown to lead to incorrect results...

... This paper reviews U.S. Air Force efforts to find a nondestructive testing (NDT) method for evaluating airfield pavement load-carrying capabilities. The paper concentrates its discussion on the wave propagation nondestructive testing method for evaluation of airfield pavements. The method...

... of the wave propagation direction. The strongest wave was found along the fibers in the ply in contact with the transducers and the weakest wave traveled 45 deg to the fibers. composite materials glass/epoxy cross-ply laminates acoustic emission acousto-ultrasonic technique damage monitoring ply...

... Approximate methods that are less time-consuming than finite-element method (FEM) analysis are needed for dynamic crack propagation and arrest calculations. In this context the one-dimensional wave propagation models, where the cracked section is modeled by a flexibility matrix, may...

... Propagation of ultrasonic waves has been studied in random particulate composites at low, intermediate, and high frequencies. The principal objective of this experimental work is to demonstrate the existence of two separate branches of wave propagation: a low-frequency acoustical branch where...

.... By imposing temporal perturbations on the deflections, the equations for stability of the vibration and the forward and backward traveling waves are derived and discussed. vibration wave propagation rotating disk orthotropy stability Hisaichi Ohnabe,^ Osamu Funatogawa,^ and Mototsugu Itoh...

... of the yarn structure using the developed model at levels where sufficient static strain is imposed to eliminate coulomb friction effects. dynamic moduli viscoelastic properties nondestructive testing yarn properties wave propagation yarn modeling C. F. Zorowskf and Z. P. Smith^ Dynamic Moduli...

... The resonant-column method, a relatively nondestructive test employing wave propagation in cylindrical specimens, is used to obtain modulus and damping of soils as functions of vibratory strain amplitude and other factors such as ambient confining stress and void ratio. Descriptions...

..., damping, data reduction, dynamic stiffness, laminates, panels, resonance, shells (structural forms), tests, vibration, wave propagation The ever-expanding uses of advanced filamentary composite materials, especially in flight vehicles of all types [1 ] ,^ have required the generation of a variety...

... in terms of soil properties. The results with this apparatus on the variation of shear modulus with confining pressure for dry sand agree well with previous results. soil mechanics vibration triaxial tests shear modulus damping wave propagation soil (material) B. O. Hardin, ~and J. Music...