Accession Number : ADA019195
Title : Crack-Length Determination for the Compact Tension Specimen Using a Crack-Opening-Displacement Calibration-Comparison of COD Measured Graphically and from the Gage Output.
Descriptive Note : Final rept.,
Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C
Personal Author(s) : Sullivan,A. M.
Report Date : 10 DEC 1975
Pagination or Media Count : 18
Abstract : To implement the increasing trend toward automated testing procedures, crack-length measurement during fatigue crack-growth-rate testing was determined using a COD gage technique. Data were analyzed both graphically and using the gage output measured in millivolts. To compensate for nonlinearity in the load-vs-COD traces, it was found necessary to sample differences in the load millivolt readings to produce smooth da/dN-vs-deltaK curves agreeing with those determined from graphical analysis of crack length. (Author)
Descriptors : *Crack propagation, *Measuring instruments, *Pressure gages, *Fatigue tests(Mechanics), Calibration, Cracks, Cracking(Fracturing), Graphics, Curve fitting, Sampling, Experimental data, Automatic, Test equipment
Subject Categories : Test Facilities, Equipment and Methods
Distribution Statement : APPROVED FOR PUBLIC RELEASE