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ASTM B106.pdf
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ASTM B106.pdf
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Designation: B 106 – 96 (Reapproved 2002)
e1
An American National Standard
Standard Test Methods for
Flexivity of Thermostat Metals
1
This standard is issued under the fixed designation B 106; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
e
1
NOTE—Paragraph 1.3 was corrected editorially in June 2002.
1. Scope
1.1 These test methods cover the determination of flexivity
(a measure of thermal deflection rate or deflection temperature
characteristics) of thermostat metals.
1.1.1 Test Method A—Tested in the form of flat strip 0.012
in. (0.30 mm) or over in thickness.
1.1.2 Test Method B—Tested in the form of spiral coils less
than 0.012 in. in thickness.
1.2 The values stated in inch-pound units are to be regarded
as the standard. The values given in parentheses are provided
for information purposes only.
1.3 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 become familiar
with all hazards including those identified in the appropriate
Material Safety Data Sheet for this product/material as pro-
vided by the manufacturer, to establish appropriate safety and
health practices, and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
B 389 Test Method for Thermal Deflection Rate of Spiral
and Helical Coils of Thermostat Metal
2
3. Terminology
3.1 Definitions:
3.1.1 thermostat metal—a composite material in the form of
sheet or strip comprising two or more metallic layers of
differing coefficients of thermal expansion, such that the radius
of curvature of the composite changes with temperature
change.
3.1.2 flexivity (F)—the change of curvature of the longitu-
dinal center line of the specimen per unit temperature change
for unit thickness, given by the following equation:
F 5 t
~
1/R
2
!
2
~
1/R
1
!
T
2
2 T
1
(1)
To determine the flexivity between any two temperatures, T
1
and T
2
, it is necessary to measure the curvature 1/ R
1
and 1/R
2
at temperature T
1
and T
2
, respectively. To find the curvature at
either temperature (Fig. 1 and Fig. 2), measure the distance D.
The curvature is given by the following equation:
1/R 5 8 D/
~
Q
2
1 4Dt 1 4D
2
!
(2)
where:
R = radius of curvature of the longitudinal center line of
the specimen, in. (mm),
t = thickness of test specimen, in. (mm),
Q = distance between support points, in. (mm), and
D = for point support (simply supported
beam), = perpendicular distance between the longitu-
dinal center lines of the lower surface of the specimen
midway between the point supports and the straight
line joining the support points, in. (mm).
4. Significance and Use
4.1 These test methods are used for determining response to
temperature change or flexivity of thermostat metal. The
flexivity is calculated from the temperatures, dimensions of
specimen, and the relative movement of the specimen. The
simple beam method is the method for certification. Any use of
the spiral coil method (Method B) is to be mutually agreed
upon between the user and supplier.
TEST METHOD A—FLAT STRIPS
5. Apparatus
5.1 Specimen Carrier, provided with two conical supports
for locating the specimen. The test length (that is, the distance
between the point of contact of the specimen with one support
and the point of contact of the specimen with the other support)
shall be known to within 60.005 in. (0.13 mm), and the line of
plane passing through the points of contact shall be horizontal.
The specimen carrier and supports shall hold the specimen
without constraint so that the curvature, due to its deflection,
will follow a vertical plane passing through the line joining the
1
These test methods are under the jurisdiction of ASTM Committee B02 on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
B02.10 on Thermostat Metal and Electrical Resistance Heating Materials.
Current edition approved Jan. 10, 1996. Published April 1996. Originally
published as B 106 – 84. Last previous edition B 106 – 90.
2
Annual Book of ASTM Standards, Vol 02.04.
1
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
Copyright ASTM International
Provided by IHS under license with ASTM
Not for Resale
No reproduction or networking permitted without license from IHS
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