Accession Number : AD0427068


Title :   FRACTURE OF METALS.


Descriptive Note : Interim rept., 22 Sep-22 Dec 63,


Corporate Author : IIT RESEARCH INST CHICAGO ILL


Personal Author(s) : Rostoker,W


Report Date : 13 Jan 1963


Pagination or Media Count : 13


Abstract : It is shown that the delayed failure of Be-copper wetted with Hg is accelerated at temperatures above room ambient. Conversely, delayed failure is retarded by simple heating in the unstressed condition to temperatures above 80 C before loading. Cumulative weakening can be erased by these thermal treatments. A mechanism for delayed failure is described in terms of grain boundary penetration by Hg to critical depths defined by the Griffith criterion for fast failure. The rate of penetration is moderated by temperature, stress level, and predisposition of infused Hg. (Author)


Descriptors :   *COPPER ALLOYS , *FAILURE(MECHANICS) , FRACTURE(MECHANICS) , BRITTLENESS , LIQUID METALS , BERYLLIUM ALLOYS , CARBON ALLOYS , MERCURY , TEMPERATURE , TIME , DIFFUSION , STRESSES


Distribution Statement : APPROVED FOR PUBLIC RELEASE