Accession Number:

AD0271800

Title:

CRACK PROPAGATION IN LOW-CYCLE FATIGUE OF MILD STEEL

Descriptive Note:

Corporate Author:

ILLINOIS UNIV URBANA

Personal Author(s):

Report Date:

1962-01-01

Pagination or Media Count:

1.0

Abstract:

An investigation was conducted to study t e parameters affecting crack propagation in low-cycle fatigue of mild steel. Flat plate specimens, centrally notched to reduce the number of cycles required to ini iate the fatigue cracks, were subjected to reversal of axial loading. Three types of repeated load cycles were studied, namely constant load, constant net section stress, and constant nominal stress. The constant nominal stress tests were conducted at stress levels ranging from 27 to 36 ksi, on specimens with widths of 5- and 7-in., at test temperatures of 78 and -40 F and for both unaged and aged specimens. A hypothesis relating the rate of crack growth and the nominal stress is presented to describe the behavior during various stages of propagation. Test results are correlated with existing theories of crack propagation. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE