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Full-Text Articles in Mechanical Engineering

Numerical Calculation Of Diffraction Coefficients In Anisotropic Media, J. Temple, L. White Jan 1993

Numerical Calculation Of Diffraction Coefficients In Anisotropic Media, J. Temple, L. White

Review of Progress in Quantitative Nondestructive Evaluation

Ultrasonic inspection is used to detect and size crack-like defects in pressure vessels and pipework used in the nuclear industry. Reliable inspection can only be achieved if the inspection technique is understood, is optimised and subsequently applied correctly. Austenitic steels are used because of their corrosion resistance and toughness. Welds and centrifugally cast materials tend to crystallise with grains larger than the ultrasonic wavelength required to achieve the desired resolution in the inspection and thus appear anisotropic. Since the grains in a weld grow along the, varying, directions of maximum heat flux during cooling, the welds are inhomogeneous as well ...


Ultrasonic Beam Propagation Through A Bimetallic Weld — A Comparison For Predictions Of The Gauss-Hermite Beam Model And Finite Element Method, A. Minachi, J. Mould, R. Bruce Thompson Jan 1993

Ultrasonic Beam Propagation Through A Bimetallic Weld — A Comparison For Predictions Of The Gauss-Hermite Beam Model And Finite Element Method, A. Minachi, J. Mould, R. Bruce Thompson

Review of Progress in Quantitative Nondestructive Evaluation

To ensure safe operation, nuclear power plants must be inspected periodically. One of the most commonly used nondestructive inspection methods uses ultrasound to detect internal flaws. However, the complex structure of some joints between different components greatly complicates the ultrasonic inspection. These joints, which consist of welds with varying and sometimes anisotropic elastic properties, can distort the ultrasonic beam and produce unreliable results. To understand the propagation of elastic waves through such materials, beam models are used.


Nondestructive Evaluation Of Radioactive Waste Drums Containing Cement-Solidified Liquid Wastes, John Steude, Jeff Anders, Richard Sporny, Ed Strickland Jan 1993

Nondestructive Evaluation Of Radioactive Waste Drums Containing Cement-Solidified Liquid Wastes, John Steude, Jeff Anders, Richard Sporny, Ed Strickland

Review of Progress in Quantitative Nondestructive Evaluation

There are approximately 1.4 million radioactive waste drums buried or stored at sites within the U.S. Department of Energy (DOE) complex [1,2]. Many of these drums contain cement-solidified liquid wastes. A common method for treating liquid wastes is to mix the liquid waste with cement and pour the waste/cement mixture into steel drums. This process stabilizes the liquid wastes in the hardened cement.


On Characterizing Operating Conditions Of Ultrasonic Systems Using Mtf And Related Techniques, R. Zilber, K. Shiloh Jan 1993

On Characterizing Operating Conditions Of Ultrasonic Systems Using Mtf And Related Techniques, R. Zilber, K. Shiloh

Review of Progress in Quantitative Nondestructive Evaluation

For a given sample under test, the quality of the ultrasonic image obtained by scanning is greately influenced by the choice of the equipment as well as by the operating conditions. The possibilities of choosing the different parameters is very wide, even if the basic ultrasonic system is determined. The parameters to select before starting an experiment include the transducer itself, its position relative to the sample, the different settings such as gain, attenuation and damping, the mode of detection, etc. The selection is usually dictated by qualitative indications which can be inaccurate or even misleading. Consequently it is very ...


Computer Modeling Of Neutron Radiography, Troy J. Groth Jan 1993

Computer Modeling Of Neutron Radiography, Troy J. Groth

Retrospective Theses and Dissertations

The need to examine materials and system components without compromising their integrity has spurred the development of nondestructive evaluation (NDE) techniques. NDE can range from a simple visual inspection of a surface to the measurement of physical properties of materials. The most prominent methods of NDE currently in use include ultrasonic testing, eddy current examination, x-ray radiography, neutron radiography, magnetic flux leakage testing, and liquid penetrant testing. Many of these fields are well developed in terms of their abilities to detect and characterize flaws within a sample. When nondestructive testing (NDT) was first introduced, the practice consisted of comparison between ...