Accession Number : AD0467857


Title :   ON FATIGUE FAILURE OF A MULTIPLE-LOAD-PATH REDUNDANT STRUCTURE.


Descriptive Note : Technical rept.,


Corporate Author : COLUMBIA UNIV NEW YORK INST FOR THE STUDY OF FATIGUE AND RELIABILITY


Personal Author(s) : Freudenthal, A M ; Shinozuka, M


Report Date : Jun 1965


Pagination or Media Count : 20


Abstract : It is difficult to evaluate the survivorship or reliability function of a structure subject to fatigue consisting of a number of members from the survivorship functions of a single specimen that can be obtained from experiment. AN ATTEMPT IS THEREFORE MADE TO ESTABLISH THE UPPER AND LOWER BOUNDS OF SUCH A SURVIVORSHIP FUNCTION UNDER THE ASSUMPTION OF CONSTANT AMPLITUDE FATIGUE AND EQUAL DISTRIBUTION OF THE LOAD AMONG THE EXISTING MEMBERS, APPROXIMATING THE REAL PROCESS OF THE FAILURE BY MARKOVIAN PROCESSES. A numerical example employing the data of fatigue tests performed on 7075 Aluminum alloy single specimens indicates that the order of magnitude of the life of a composite structure can be reasonably well predicted by the estimate of the bounds according to the present method. (Author)


Descriptors :   *STRUCTURES , LOAD DISTRIBUTION , LOADS(FORCES) , MULTIPLE OPERATION , DYNAMICS , FATIGUE(MECHANICS) , ALUMINUM ALLOYS , FAILURE(MECHANICS)


Distribution Statement : APPROVED FOR PUBLIC RELEASE