Accession Number:

AD0266346

Title:

COMMENTS ON CERTAIN INVESTIGATIONS RELATING TO HIGH-STRESS-LOW CYCLE FATIGUE

Descriptive Note:

Corporate Author:

CALIFORNIA INST OF TECH PASADENA GRADUATE AERONAUTICAL LABS

Personal Author(s):

Report Date:

1961-07-01

Pagination or Media Count:

1.0

Abstract:

A review of the recent publications in he field of high stress - low cycle - fatigue is made, and several of the e pirical relations proposed are compared. It is found that basically high stress level fatigue is characteristically similar to failure under static conditions. An inquiry is made into the essential requirements of any investigation concerned with the problem of high stress level fatigue. These are 1 the rate and ext nt of crack propagation during progressive cycling 2 the extent of the ar a of plastic deformation 3 the changes of this plastic enclave during progressive cycling and 4 the hysteresis loop for every element of this plastic enclave as it progresses during the progression of the crack due to repeated loa ing Possible means of inv stigating these 4 items were analyzed and recommendations were made for lines of further study. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE