ASTM E517-00(2006)
(Test Method)Standard Test Method for Plastic Strain Ratio r for Sheet Metal
Standard Test Method for Plastic Strain Ratio r for Sheet Metal
SCOPE
1.1 This test method covers special tension testing for the measurement of the plastic strain ratio, r, of sheet metal intended for deep-drawing applications.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
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.
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Designation:E517–00 (Reapproved 2006)
Standard Test Method for
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Plastic Strain Ratio r for Sheet Metal
This standard is issued under the fixed designation E517; 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.
1. Scope 3.1.1.1 Discussion—In cold-reduced and annealed low-
carbonsteelsheet, r and r areusuallygreaterthan r ,while
1.1 This test method covers special tension testing for the 0 90 45
in hot-rolled steels r may be greater. Other earing tendencies
45
measurement of the plastic strain ratio, r, of sheet metal
occur; thus, for some materials the earing tendency may be
intended for deep-drawing applications.
better represented by r − r .
max min
1.2 The values stated in inch-pound units are to be regarded
3.1.2 plastic-strain ratio r (in sheet metal that has been
as standard. The values given in parentheses are mathematical
strained by uniaxial tension sufficiently to induce plastic flow)
conversions to SI units that are provided for information only
is the ratio of the true strain that has occurred in a width
and are not considered standard.
direction w perpendicular to the direction of applied stress and
1.3 This standard does not purport to address all of the
in the plane of the sheet, to the concomitant true strain in the
safety concerns, if any, associated with its use. It is the
thickness direction t. Thus, r is numerically equal to
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- r 5e /e (1)
w t
bility of regulatory limitations prior to use.
where:
e = width strain, and
2. Referenced Documents
w
e = thickness strain.
2
t
2.1 ASTM Standards:
3.1.2.1 Discussion—Due to difficulty in measuring thick-
E6 Terminology Relating to Methods of Mechanical Test-
nesschangeswithsufficientprecision,inpracticeanequivalent
ing
relationship is commonly used, based on length and width
E8 Test Methods for Tension Testing of Metallic Materials
strain measurements (see 9.1.2).
E83 Practice for Verification and Classification of Exten-
3.1.3 r —weighted average of r values obtained in three
m
someter Systems
directions:0°(parallel),45°(diagonal),and90°(transverse)to
E92 Test Method for Vickers Hardness of Metallic Mate-
the rolling direction (see 10.3).
rials
3.1.3.1 Discussion—Somematerialsmayshowsignificantly
E177 Practice for Use of the Terms Precision and Bias in
different values of r for other test directions, in which case an
ASTM Test Methods
averagevaluemayincludethesewhenspecialnoteismadeand
E691 Practice for Conducting an Interlaboratory Study to
another subscript is used to avoid confusion with r as defined
m
Determine the Precision of a Test Method
in3.1.3.Symbolswhichareoftenusedinterchangeablywithr
m
are r¯ and r-Bar.
3. Terminology
3.1.4 yield point elongation (for a material that has a yield
3.1 Definitions of Terms Specific to This Standard:
point)isthetotalstrainassociatedwithdiscontinuousyielding.
3.1.1 delta r (D r)—measure of the tendency of sheet to
3.2 The definitions relating to tension testing appearing in
draw in nonuniformly and to form ears in the flange of
TerminologyE6 shall apply to this test method.
deep-drawn cylindrical parts in the directions of higher r value
(see 10.4).
4. Significance and Use
4.1 Theplasticstrainratio risaparameterthatindicatesthe
ability of a sheet metal to resist thinning or thickening when
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This test method is under the jurisdiction of ASTM Committee E28 on
subjectedtoeithertensileorcompressiveforcesintheplaneof
Mechanical Testing and is the direct responsibility of Subcommittee E28.02 on
the sheet. It is a measure of plastic anisotropy and is related to
Ductility and Flexure.
the preferred crystallographic orientations within a polycrys-
Current edition approved Sept. 1, 2006. PublishedSeptember 2006. Originally
approved in 1981. Last previous edition approved in 2000 as E517–00.
talline metal. This resistance to thinning or thicken-ing con-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
tributes to the forming of shapes, such as cylindrical flat-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
bottom cups, by the deep-drawing process. The r value,
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. therefore,isconsideredameasureofsheetmetaldrawability.It
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E517–00 (2006)
isparticularlyusefulforevaluatingmaterialsinten
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