SYMPOSIA PAPER Published: 01 January 1981
STP33454S

Procedures for Precision Measurement of Fatigue Crack Growth Rate Using Crack-Opening Displacement Techniques

Source

This paper describes experimental and analytical procedures whereby the conventional commercial fracture mechanics clip-gage can be used for precision measurement of fatigue crack growth rate in compact-type specimens. Potential sources of error in measuring crack length via crack-opening displacement (COD) techniques are delineated. Comparisons are made between crack-length data obtained via specimen surface observations and COD techniques. Comparisons are also made between data analyzed by the secant and 7-point incremental polynomial methods. It is emphasized that COD techniques can enhance the accuracy of the secant method of data reduction. Steploading procedures using COD techniques are described. Proposed amendments to ASTM Tentative Test Method for Constant-Load-Amplitude Fatigue Crack Growth Rates Above 10−8 m/Cycle (E 647-78 T) regarding incrementing of crack-length measurements via COD techniques are discussed.

Author Information

Yoder, GR
Mechanics of Materials Branch, Material Science and Technology Division, Naval Research Laboratory, Washington, D.C.
Cooley, LA
Mechanics of Materials Branch, Material Science and Technology Division, Naval Research Laboratory, Washington, D.C.
Crooker, TW
Mechanics of Materials Branch, Material Science and Technology Division, Naval Research Laboratory, Washington, D.C.
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Details
Developed by Committee: E08
Pages: 85–100
DOI: 10.1520/STP33454S
ISBN-EB: 978-0-8031-4804-8
ISBN-13: 978-0-8031-0717-5