Masters Theses


"In this investigation, the surface energy of a medium-grained igneous rock (Barre granite) was measured by breaking small, notched beams in bending. The technique was adapted from fracture toughness tests that have been used with metals and ceramics. The equations used for the calculation of surface energy were derived from several writers' equations for the stress intensity at the end of a notch in a beam subject to bending. Beam thickness, notch width and mineral occurring at the notch tip were evaluated for their influence on the calculated values of surface energy. The surface energy values obtained were used in conjunction with failure stresses from tensile and flexure tests to predict flaw sizes on the basis of the Griffith failure hypothesis. The surface energy measured by the notched-beam method was consistent with values obtained for similar rocks by other methods. The only significant influence on the measured surface energy value was the occurrence of mica at the notch tip. Calculated flaw sizes were equivalent to the grain sizes of the rock tested, which supported the validity of the Griffith hypothesis for rock"--Abstract, page ii.


Rockaway, John D.

Committee Member(s)

Aughenbaugh, N. B.
Summers, David A.


Geosciences and Geological and Petroleum Engineering

Degree Name

M.S. in Geological Engineering


United States. Department of Defense
University of Missouri--Rolla. Department of Mining, Petroleum, and Geological Engineering
University of Missouri--Rolla. Rock Mechanics & Explosives Research Center


University of Missouri--Rolla

Publication Date



vii, 44 pages

Note about bibliography

Includes bibliographical references (pages 135-137).


© 1970 John Walter Corwine, All rights reserved.

Document Type

Thesis - Open Access

File Type




Library of Congress Subject Headings

Surface energy -- Measurement -- Mathematical models
Granite -- Fracture -- Measurement
Granite -- Fracture -- Testing
Granite -- Analysis

Thesis Number

T 2503

Print OCLC #


Electronic OCLC #