Digital Computer Controlled Threshold Stress Intensity Factor Fatigue Testing

LR Kaisand; P LeFort

doi:10.1520/STP27908S

SYMPOSIA PAPER Published: 01 January 1976

STP27908S

Digital Computer Controlled Threshold Stress Intensity Factor Fatigue Testing

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The integrity of many structures depends on their resistance to fatigue crack propagation which is a function of the stress intensity factor. Furthermore, there appears to be a threshold level of the stress intensity factor range, ΔK_th, below which crack growth is greatly inhibited.

This paper describes a test method used to determine crack growth rate data in the region of this threshold value. The technique utilizes crack opening displacement as the controlled variable.

Control is provided by programming a digital minicomputer to supply the command signal to the closed-loop servocontrolled test system. Use of the computer allows continuous operation and automatic data acquisition and reduction with a minimum of operator surveillance.

Author Information

Kaisand, LR

Materials and Processes Laboratory, General Electric Company, Schenectady, N.Y.

LeFort, P

Materials and Processes Laboratory, General Electric Company, Schenectady, N.Y.

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Details

Developed by Committee: E08

Pages: 142–159

DOI: 10.1520/STP27908S

ISBN-EB: 978-0-8031-4686-0

ISBN-13: 978-0-8031-0593-5

Digital Computer Controlled Threshold Stress Intensity Factor Fatigue Testing

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