ASTM B528-99

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Designation:B528–99
Standard Test Method for
Transverse Rupture Strength of Metal Powder Specimens
This standard is issued under the fixed designation B 528; 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.
1. Scope 3. Terminology
1.1 This test method covers determination of the transverse 3.1 Definitions—Fordefinitionsoftermsinthistestmethod,
rupture strength of sintered, including post-treated, metal see Terminology B 243.
powder test specimens by subjecting them to a uniformly
4. Significance and Use
increasing transverse force under controlled conditions. The
term “transverse rupture strength” as used herein, defines the 4.1 This test method is used to measure the strength of
sintered, including post-treated, specimens. Transverse rupture
stress, calculated from the flexure formula required to break a
specimen as a simple beam supported near the ends and strength is not a design value. For many sintered materials,
transverse rupture strength is approximately twice the ultimate
applying the force midway between the fixed line center of the
supports. tensile strength.
1.2 Limitations— The transverse rupture test is only appli-
5. Apparatus
cable to relatively brittle materials. In cases where a ductile
5.1 Punches and Die (Fig. 1), for producing a test specimen
specimen is being tested and the permanent deflection as a
in accordance with 6.1
result of testing exceeds 0.020 in. (0.50 mm), the test results
5.2 Equipment capable of applying the required pressure to
may be questionable.
produce the standard test specimen.
1.3 The values stated in inch-pound units are to be regarded
5.3 Balance, suitable for weighing accurately to 0.01 g.
as the standard. The SI values are provided for information
5.4 Micrometer, with a resolution of 0.0001 in. (0.002 mm).
only.
5.5 Transverse Rupture Strength Fixture, as shown in Fig. 2.
1.4 Test Method B 406 should be consulted for determining
5.6 Compression Testing Machine, capable of applying a
the transverse rupture strength of cemented carbides.
breaking force on the test specimen with an accuracy of 1.0 %
1.5 This standard does not purport to address all of the
and readable to the nearest 10 lbf (50 N).
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
6. Test Specimen
priate safety and health practices and determine the applica-
6.1 The test specimen shall have the shape and dimensions
bility of regulatory limitations prior to use.
shown in Fig. 3.
2. Referenced Documents
7. Procedure
2.1 ASTM Standards:
7.1 Prepare test specimens by pressing and sintering using
B 243 Terminology of Powder Metallurgy
tooling described in Test Method B 312, or machine from
B 312 Test Method for Green Strength for Compacted
finished parts. Measure the width and thickness of the speci-
Metal Powder Specimens
mens to the nearest 0.001 in. (0.03 mm) with a micrometer.
B 406 Test Method for Transverse Rupture Strength of
7.2 Locatethespecimeninthetransverserupturetestfixture
Cemented Carbides
perpendicular to the supporting rods.Apply compressive force
parallel to the pressing direction of the specimen at a no-load
This test method is under the jurisdiction of ASTM Committee B-9 on Metal
crosshead speed of not greater than 0.2 in. (5.0 mm)/min until
Powders and Metal Powder Products and is the direct responsibility of Subcom-
rupture occurs. Record this breaking force to the nearest 10 lbf
mittee B09.05 on Structural Parts.
(50 N).
Current edition approved Nov. 10, 1999. Published February 2000. Originally
published as B528–70. Last previous edition B528-98.
Annual Book of ASTM Standards, Vol 02.05.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B528
NOTE 1—The dimensions for the cavity shall be 0.500 6 0.004 in. wide (12.70
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