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Ductile creep rupture is considered and an analysis of a work-hardening plastic material which is subject to creep is made. Under a constant tensile load, the true stress acting on a creep specimen increases and the rate of work-hardening decreases. It is shown that tensile instability develops when the rate of work-hardening becomes equal to the true stress. It is noted that both tensile instability and creep rupture, and compressive instability and column creep buckling are controlled by the current state of workhardening. (Author).

Vols. 3- 1891/1920- include graduates of the Cooper Medical College, San Francisco; v. 4- 1891/1931- include graduates of the Stanford School of Nursing.

The nonlinear partial differential equations of von Karman and Donnell governing the deformations of initially imperfect cylindrical shells are reduced to a consistent set of ordinary differential equations. A numerical procedure is then developed for the solution of these equations together with the associated boundary conditions. This method is used to determine the number of waves at buckling as well as the load carrying capacity of imperfect cylindrical shells of finite length subjected to uniform axial compression in the presence of the least amount of restraint along the simply supported boundaries. It is found that details of the boundary conditions have little effect on the number of waves into which the shell buckles around the circumference. This number is determined essentially by the length-to-radius and radius-to-thickness ratios. The absence of an edge restraint to circumferential displacements reduces the classical value of the buckling load by a factor of about two as compared to the classical value. On the other hand, shells with these boundary conditions are less sensitive to initial imperfections in the shape, and thus the maximal load supported in the presence of unavoidable initial deviations can be the same for shells with and without a restraint to circumferential displacements along the edges. (Author).

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