Nondestructive testing techniques have attracted growing interest in the last few years due to their ability assess material properties without damaging specimens. The free-free resonance method is a nondestructive technique based on analysis of natural frequencies sample. This study presents and discusses applicability this technique, traditionally used soils, for mechanical characterization r...

An algorithm is given for calculating the solution to the 3D inverse scattering problem with noisy discrete fixed energy data. The error estimates for the calculated solution are derived. The methods developed are of general nature and can be used in many applications: in nondestructive evaluation and remote sensing, in geophysical exploration, medical diagnostics and technology.

The Electric Current Injection (ECI) method of nondestructive evaluation is applied to materials that are electrically conductive but not magnetically permeable, such as aluminum, magnesium, and titanium. It consists of detecting current-flow anomalies due to voids, nonmetallic inclusions and open cracks in the conducting material, through distortions introduced in the magnetic field generated ...

Fluorescence imaging is a tool of increasing importance in aerodynamics, fluid flow visualization, and nondestructive evaluation in a variety of industrial circumstances. It is a means for producing two-dimensional images of real surfaces or fluid case-sectional areas that correspond to data on properties such as temperature or pressure across the surfaces. This article discusses three major fl...

Multilayered composite structures and devices have become more popular and are now routinely introduced in advanced systems to reduce size and weight and to improve performance. However, because of the combined complexity of the materials and designs used in these systems, it is a significant challenge to determine the structural integrity and reliability of a specific structure or device using...

FHWA has completed a multiyear study of systems and techniques to identify and characterize cracks in steel bridge structures. The study was conducted by FHWA’s Nondestructive Evaluation (NDE) Laboratory at the Turner-Fairbank Highway Research Center in McLean, VA. The study, called the Steel Bridge Testing Program, was authorized under the 2005 Safe, Accountable, Flexible, Efficient Transporta...