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ASTM A 596/A 596M Document Information:
Title
Standard Test Method for Direct-Current Magnetic Properties of Materials Using the Ballistic Method and Ring Specimens
ASTM International
Publication Date:
Feb 15, 1995
Scope:
This test method covers dc ballistic testing for the determination of
basic magnetic properties of
materials in the form of ring, toroidal, link, double-lapped Epstein
cores, or other standard
shapes which may be cut, stamped, machined, or ground from cast,
compacted, sintered, forged, or
rolled materials. It includes tests for normal induction and
hysteresis taken under conditions of
steep wavefront reversals of the direct-current magnetic field
strength.
This test method shall be used in conjunction with Practice A 34/A
34M.
This test method is suitable for a testing range from very low
magnetic field strength up to 200 or
more Oe [15.9 or more kA/m]. The lower limit is determined by
integrator sensitivity and the upper
limit by heat generation in the magnetizing winding. Special
techniques and short duration testing
may extend the upper limit of magnetic field strength.
Testing under this test method is inherently more accurate than other
methods. When specified
dimensional or shape requirements are observed, the measurements are a
good approximation to
absolute properties. Test accuracy available is primarily limited by
the accuracy of
instrumentation.
This test method permits a choice of test specimen to permit
measurement of properties in any
desired direction relative to the direction of crystallographic
orientation without interference
from external yoke systems.
The symbols and abbreviated definitions used in this test method
appear in Fig. 1 and Sections 5,
6, 9, and 10. For the official definitions see Terminology A 340. Note
that the term flux density
used in this document is synonymous with the term magnetic induction.
The values stated in either customary (cgs-emu and inch-pound) units
or SI units are to be regarded
separately as standard. Within this test method, the SI units are
shown in brackets except for the
sections concerning calculations where there are separate sections for
the respective unit systems.
The values stated in each system are not exact equivalents; therefore,
each system shall be used
independently of the other. Combining values from the two systems may
result in nonconformance with
this method.
This standard does not purport to address all of the safety concerns,
if any, associated with its
use. It is the responsibility of the user of this standard to
establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.
Keywords:
- ballistic test
- coercive force
- direct current
- Epstein
- induction
- magnetic field strength
- magnetic test
- permeability
- residual induction
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