The many developments and clarifications in the theory of elasticity
and its applications which have occurred since the first edition was
written are reflected in numerous additions and emendations in the
present edition. The arrangement of the book remains the same for
the most part.
The treatments of the photoelastic method, two-dimensional
problems in curvilinear coordinates, and thermal stress have been
rewritten and enlarged into separate new chapters which present many
methods and solutions not given in the former edition. An appendix
on the method of finite differences and its applications, including the
relaxation method, has been added. New articles and paragraphs
incorporated in the other chapters deal with the theory of the strain
gauge rosette, gravity stresses, Saint-Venant's principle, the components
of rotation, the reciprocal theorem, general solutions, the approximate
character of the plane stress solutions, center of twist and center of
shear, torsional stress concentration at fillets, the approximate
treatment of slender {e.g., solid airfoil) sections in torsion and bending,
and the circular cylinder with a band of pressure.
Problems for the student have been added covering the text as far
as the end of the chapter on torsion.
It is a pleasure to make grateful acknowledment of the many helpful
suggestions which have been contributed by readers of the book.