Donald O. Thompson's Books

Review of Progress in Quantitative Nondestructive Evaluation

Volume 7B

By: Donald O. Thompson,Dale E. Chimenti

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Review of Progress in Quantitative Nondestructive Evaluation

Volume 7B

By: Donald O. Thompson,Dale E. Chimenti

It has been shown both experimentally {2} and theoretically {2,3} that surface skimming SH waves propagating along symmetry axes of the texture have velocities that differ in proportion to the magnitude of any stress that lies along one of the symmetry axes. Specifically, the stress is directly proportional to the relative velocity difference through the equation -,--V ik=---V. -=ki) ( I) cr. = 2G (-V ~ ik where cr. is the stress in the direction i, G is the shear modulus and Vik is the ~elocity of an SH wave propagating in the i direction and polarized in the k direction. This rather simple relationship is particularly useful because the constant of proportionality involves only the well known shear modulus and the velocity term can be measured directly by observing the transit time shift when a transmitter-receiver pair of SH wave transducers are rotated through 90 degrees on the surface of the part. Experimentally, Equation (I) was tested on the web of railroad rails which had been loaded by a 200,000 pound mechanical testing machine {I}. The method of exciting and detecting the necessary surface skimming SH waves used electromagnetic acoustic transducers (EMATs) that operated through a magnetostrictive mechanism at high magnetic fields {4}. Wave velocities parallel and perpendicular to the axis of the rail on the web differed by the amount predicted by Equation (I) to an absolute accuracy of 30 percent in the worst case.

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945

Publisher

Springer Science & Business Media

Published Date

ISBN 10

1461309794

ISBN 13

9781461309796

Hoover, Blacks, and Lily-Whites

A Study of Southern Strategies

By: Donald J. Lisio

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Hoover, Blacks, and Lily-Whites

A Study of Southern Strategies

By: Donald J. Lisio

For more than fifty years, Hoover has been viewed as a lily-white racist who attempted to revitalize Republicanism in the South by driving blacks from positions of leadership at all party levels. Lisio demonstrates that this view is both inaccurate and incomplete, that Hoover hoped to promote racial progress. He shows that Hoover's efforts to reform the southern state parties led to controversy with lily-whites as well as blacks in both the North and the South. Originally published in 1985. A UNC Press Enduring Edition -- UNC Press Enduring Editions use the latest in digital technology to make available again books from our distinguished backlist that were previously out of print. These editions are published unaltered from the original, and are presented in affordable paperback formats, bringing readers both historical and cultural value.

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Page Count

396

Publisher

UNC Press Books

Published Date

ISBN 10

0807874213

ISBN 13

9780807874219

Corporatism and the Rule of Law

A Study of the National Recovery Administration

By: Donald R. Brand

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Corporatism and the Rule of Law

A Study of the National Recovery Administration

By: Donald R. Brand

This illuminating new look at Franllin Roosevelt's National Recovery Administration (NRA) challenges widely accepted conclusions about that program. Tracing the intellectual origins of the NRA to pragmatism and its political origins to progressivism, Donald R. Brand argues that the NRA was an ambitious attempt to secure social justice for the organizationally disadvantaged in American society.

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Page Count

355

Publisher

Cornell University Press

Published Date

ISBN 10

1501745530

ISBN 13

9781501745539

Book's by Donald O. Thompson

Review of Progress in Quantitative Nondestructive Evaluation

Review of Progress in Quantitative Nondestructive Evaluation

Hoover, Blacks, and Lily-Whites

Hoover, Blacks, and Lily-Whites

Corporatism and the Rule of Law

Corporatism and the Rule of Law

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