Location

La Jolla, CA

Start Date

1-1-1991 12:00 AM

Description

The magnetic leakage field produced by a discontinuity draws and holds the ferromagnetic particles used in magnetic particle inspection (MPI). The particles held by the leakage field then provide the visible evidence to the location of the discontinuity. A change in the leakage field could, potentially, change the detectability of the crack. [1] Typically, the study of magnetic leakage fields has been limited to those emanating from air-filled discontinuities. However, for this investigation, the leakage fields from surface cracks filled with a magnetic iron oxide scale were observed. The goal was to determine if cracks filled with common magnetic oxides could essentially “bridge the magnetic gap” and, therefore, be masked during MPI.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

10B

Chapter

Chapter 7: Characterization of Materials

Section

Non-Linear Acoustic Properties

Pages

1899-1904

DOI

10.1007/978-1-4615-3742-7_99

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Detection of Magnetic Oxide Filled Cracks in Steel

La Jolla, CA

The magnetic leakage field produced by a discontinuity draws and holds the ferromagnetic particles used in magnetic particle inspection (MPI). The particles held by the leakage field then provide the visible evidence to the location of the discontinuity. A change in the leakage field could, potentially, change the detectability of the crack. [1] Typically, the study of magnetic leakage fields has been limited to those emanating from air-filled discontinuities. However, for this investigation, the leakage fields from surface cracks filled with a magnetic iron oxide scale were observed. The goal was to determine if cracks filled with common magnetic oxides could essentially “bridge the magnetic gap” and, therefore, be masked during MPI.