Fatigue crack propagation in a specimen with a complicated cross section: Characterization of the stress intensity factor

Journal Article · Mon Feb 28 23:00:00 EST 1994 · Journal of Testing and Evaluation; (United States)

OSTI ID:5118842

Makabe, Chobin; Kaneshiro, Hideo; Yara, Hideo ^[1]

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1. Univ. of the Ryukyus, Okinawa (Japan)

In order to predict the fatigue life of machine equipment, the fatigue crack propagation law has up to now been investigated using specimens with a simple cross-section shape. In this study, a specimen with three grooves cut in the loading direction was used to clarify crack propagation and crack closure behavior at points of discontinuous change in thickness. It was found that the crack propagation curve showed a complicated variation in the vicinity of the grooves and that the variation of crack closure behavior correlated well with it. The stress intensity factor was evaluated using the calibration curve between the crack propagation rate and the effective stress intensity factor range obtained from a similar smooth specimen. Results showed that the stress intensity factor of the grooved specimen was higher in front of the first groove and lower behind it, compared to the smooth specimen. As the crack crossed the first groove, the crack propagation rate exhibited a local maximum as a function of the maximum value of stress intensity factor.

• OSTI ID: 5118842
• Journal Information: Journal of Testing and Evaluation; (United States), Journal Name: Journal of Testing and Evaluation; (United States) Vol. 22:2; ISSN JTEVAB; ISSN 0090-3973
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
42 ENGINEERING
420500 -- Engineering-- Materials Testing
ALLOYS
CRACK PROPAGATION
DATA
EXPERIMENTAL DATA
FATIGUE
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
LIFETIME
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
NUMERICAL DATA
SAMPLE PREPARATION
SERVICE LIFE
STEELS
TESTING