RATCHETTING IN THE CREEP RANGE
This report attempts to present a "State of the Art" of this problem from three contracting and complementary points of view which reflect separate traditions. Part I gives a brief summary of the three constitutive parts with a discussion of the relationship between them. Part II is an attempt by a group of CEA Saclay, France, to distill from available experimental data a set of rules expressed in terms of the stress classifications of the ASME codes, which will ensure the prevention of excessive creep ratchetting. The resulting stresses to an effective (or reference) stress and the creep assessment is then made in terms of the creep produced by the effective stress. The technique provides a considerable advantage over the rules of N47. Part III by Ponter and Cocks of the University of Leicester is a theoretical study of the problem using bounding and other approximate techniques. The problem is studied in a sequence of increasingly complex problems commencing with an isothermal structure subjected to constant load and terminating in a structure subjected to arbitrary cyclic thermal loading. The results are expressed in terms of a reference stress and a reference history of temperature. Part IV by Corradi and Franchi discusses the methods by which finite element solution may be calculated.
Bibliographic Reference: EUR 9876 EN 91985) FS, 328 P., BFR 1100, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989124079100 / Last updated on: 1987-01-01
Available languages: en