Engineering Evaluation of the Status of Utilization of Beryllium From the Viewpoint of Fracture Mechanics. Page: 2 of 35
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-1-
AN ENGINEERING EVALUATION
OF THE STATUS OF UTILIZATION OF BERYLLIUM
FROM THE VIEWPOINT OF FRACTURE MECHANICS *
P. C. PARIS
Del Research Corporation and Lehigh University
Bethlehem, Pennsylvania, USA
and
D. 0. HARRIS
Laurence Radiation Laboratory, University of California
Livermore, California, USA
Abstract - The inherent brittleness of beryllium makes it a prime candidate
for the utilization of fracture mechanics information for design
purposes. One obstacle to the more widespread use of fracture mechanics
in the design of beryllium structures is the scarcity of information
on its fracture toughness and subcritical flaw growth characteristics.
A summary of the available data is presented, which indicates that
Be does not compare favorably with other modern structural alloys
on the basis of its static fracture properties. However, the limited
amount- of fatigue crack growth information available indicates that
beryllium may have certain advantages in fatigue applications, and that
proof testing provides a straightforward means of ensuring the integrity
of. cyclically loaded beryllium structures. More information on the
fatigue crack growth characteristics of beryllium is required to verify
this. Additional fracture toughness test results are also required,
and the effects of microalloying and thermal history on Kc should be
investigated in detail. Information on the stress corrosion character-
istics of Be is presently not available. Such tests are certainly
warranted, and are required in order to assess the integrity of beryllium
structures in various environments. The combined effects of fatigue and
* Work performed under the auspices of the U.S. Atomic Energy Commission.
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Paris, P. C. & Harris, D. O. Engineering Evaluation of the Status of Utilization of Beryllium From the Viewpoint of Fracture Mechanics., report, January 1, 1970; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc870733/m1/2/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.