ASTM B223-03

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Designation:B223–03
Standard Test Method for
Modulus of Elasticity of Thermostat Metals (Cantilever
1
Beam Method)
This standard is issued under the fixed designation B223; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
3 3
1. Scope
E 54Pl /dbt
1.1 This test method covers the determination of the modu-
where:
lus of elasticity of thermostat metals at any temperature
E = modulus of elasticity, psi or MPa,
between−300 and+1000°F (−185 and 540°C) by mounting
P = load, lbf or N,
thespecimenasacantileverbeamandmeasuringthedeflection
l = gage length, in. or mm,
when subjected to a mechanical load.
d = specimen deflection, in. or mm,
1.2 The values stated in inch-pound units are to be regarded
b = specimen width, in. or mm, and
as the standard.
t = specimen thickness, in. or mm.
1.3 This standard does not purport to address all of the
4. Apparatus (Figs. 1-3)
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to become familiar 4.1 Specimen Holder for securely clamping the test speci-
with all hazards including those identified in the appropriate
men in a horizontal position as a cantilever beam when
Material Safety Data Sheet for this product/material as pro- immersed in a bath at the desired temperature. It shall carry a
vided by the manufacturer, to establish appropriate safety and
micrometer depth gage for reading the deflection of the
health practices, and determine the applicability of regulatory specimen and a loading rod for loading the specimen. Both of
limitations prior to use.
theseshallextendsufficientlyabovetheliquidlevelofthebath
to permit the operator to perform the test at the higher test
2. Referenced Documents
temperatures.
2.1 ASTM Standards:
4.1.1 Specimen holder to be made sufficiently rigid to allow
2
B388 Specification for Thermostat Metal Sheet and Strip
normal handling without distortion.
1
4.2 Loading Rod, ⁄8 in. (3.2 mm) or less in diameter, for
3. Terminology
carrying the load and transmitting its weight vertically to the
3.1 Definitions:
freeendofthecantileverspecimen.Itshallbemadeofmaterial
3.1.1 thermostat metal—a composite material, usually in
the same as that of the tube which supports the specimen
the form of sheet or strip, comprising two or more materials of
mounting clamps in order to prevent a difference in expansion
any appropriate nature, metallic or otherwise, which, by virtue
rates from affecting the deflection readings. The bottom end
of the differing expansivities of the components, tends to alter
shall be conically shaped and shall rest in the conical punch
its curvature when its temperature is changed.
markatthefreeendofthespecimen.Anysupportsshallpermit
3.1.2 modulus of elasticity—the ratio, within the elastic
free movement with specimen deflection and shall provide
limit of a material, of stress to corresponding strain. In this test
electrical insulation from the micrometer depth gage. Near the
method the modulus of elasticity is calculated from the
top shall be a holder for supporting the load.The weight of the
expression for the deflection of a cantilever beam under
loading rod and holder shall be no greater than 1 oz (28 g).
mechanical load which is transposed to read as follows:
4.3 Micrometer Depth Gage,formeasuringthedeflectionof
the specimen to the nearest 0.0001 in. (0.002 mm). It shall be
mounted directly over the loading rod. The micrometer shaft
1
This test method is under the jurisdiction of ASTM Committee B02 on
shall be in the same vertical line as the loading rod, so that
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
readings can be taken of the top of the loading rod for no-load
B02.10 on Thermostat Metals and Electrical Resistance Heating Materials.
Current edition approved June 10, 2003. Published August 2003. Originally
and full-load positions.The gage shall be insulated electrically
approved in 1948. Last previous edition approved in 1997 as B223-97.
from the specimen holder and the loading rod.
2
Annual Book of ASTM Standards, Vol. 02.04.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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B223–03
FIG. 1 Testing Machine for Determining Modulus of Elasticity of Thermostat Metal
4.5 Bath—A stirred liquid so that the temperature shall be
substantially constant during the test.
4.6 Electronic Indicator, sensitive, low-current, to give a
signal when the micrometer depth gage shaft completes the
electrical circuit across the indicator terminals by t
...