ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 3

A New Method of Detecting Fatigue Crack Propagation in Ferromagnetic Specimens

Bhattacharya, S
Research assistant and professor, Syracuse University, Syracuse, N.Y.

Schröder, K
Research assistant and professor, Syracuse University, Syracuse, N.Y.

Abstract

This paper describes a new method for detecting fatigue crack growth in ferromagnetic specimens. This method is similar to the Barkhausen effect type of measurement, where discontinuous voltage pulses are induced in a pickup coil surrounding a specimen when the specimen is magnetized slowly. As a fatigue crack grows, similar voltage pulses are generated. Simultaneous display of the Barkhausen-type magnetic signals and the acoustic emission signals during fatigue crack propagation show that they are correlated.

Keywords:
fatigue (materials), crack propagation, ferromagnetic materials, Barkhausen effect, magnetic signals, acoustic emission, nondestructive tests, signal to noise ratio

Paper ID: JTE10657J
DOI: 10.1520/JTE10657J
ASTM International is a member of CrossRef.