ASTM D6682-08
(Test Method)Standard Test Method for Measuring Shear Stresses of Powders Using Peschl Rotational Split Level Shear Tester (Withdrawn 2017)
Standard Test Method for Measuring Shear Stresses of Powders Using Peschl Rotational Split Level Shear Tester (Withdrawn 2017)
SIGNIFICANCE AND USE
The test method is useful for the following:
Classification of Powders—The cohesion and angle of internal friction are flowability indicators of powders and can be used to classify the powders.
Quality Control—For a number of industrial applications flowability factors are used to compare the material flowability at different times during production. The material produced has to be held within given limits for each application and each powder so as to ensure trouble-free operation.
Material Engineering—Powder properties are influenced by particle size, particle size distribution, fat content, humidity and other parameters. By selecting the correct parameters and the correct mixtures of powders, the required mechanical properties of the product are achieved.
Design of Handling Equipment—For certain storage and conveyor equipment mathematical models exist which require the mechanical properties of powders.
Note 2—The quality of the result produced by this standard is dependent on the competence of personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D 3740 are generally considered capable of competent and objective testing/sampling/inspection/etc. Users of this standard are cautioned that compliance with Practice D 3740 does not in itself assure reliable results. Reliable results depend on many factors; Practice D 3740 provides a means of evaluating some of those factors. Practice D 3740 was developed for agencies engaged in the testing or inspection (or both) of soil and rock. As such it is not totally applicable to agencies performing this standard. However, users of this standard should recognize that the framework of Practice D 3740 is appropriate for evaluating the quality of an agency performing this standard. Currently there is no known qualifying national authority that inspects agencies that perform this standard.
SCOPE
1.1 This test method is applied to the measurement of the mechanical properties of powders as a function of normal stress.
1.2 This apparatus is suitable measuring the properties of powders and other bulk solids, up to a particle size of 5000 micron.
1.3 This method comprises four different test procedures for the determination of powder mechanical properties:
1.3.1 Test A—Measurement of INTERNAL FRICTION as a function of normal stress.
1.3.2 Test B—Measurement of WALL FRICTION as a function of normal stress.
1.3.3 Test C—Measurement of BULK DENSITY as a function of normal stress and time.
1.3.4 Test D—Measurement of DEGRADATION as a function of normal stress.
1.4 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D 6026.
1.4.1 The procedures used to specify how data are collected/recorded or calculated in this standard are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be retained. The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the user’s objectives, and it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations. It is beyond the scope of this standard to consider significant digits used in analysis methods for engineering design.
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.6 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.
WITHDRAWN RATIONALE
This test method is applied to the measurement of the mechanical properties of powders as a function of no...
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D6682 − 08
Standard Test Method for
Measuring Shear Stresses of Powders Using Peschl
1
Rotational Split Level Shear Tester
This standard is issued under the fixed designation D6682; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 1.6 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.1 This test method is applied to the measurement of the
responsibility of the user of this standard to establish appro-
mechanical properties of powders as a function of normal
priate safety and health practices and determine the applica-
stress.
bility of regulatory limitations prior to use.
1.2 This apparatus is suitable measuring the properties of
powders and other bulk solids, up to a particle size of 5000
2. Referenced Documents
micron.
2
2.1 ASTM Standards:
1.3 This method comprises four different test procedures for
D653 Terminology Relating to Soil, Rock, and Contained
the determination of powder mechanical properties:
Fluids
1.3.1 Test A—Measurement of INTERNALFRICTION as a
D3740 Practice for Minimum Requirements for Agencies
function of normal stress.
Engaged in Testing and/or Inspection of Soil and Rock as
1.3.2 Test B—Measurement of WALL FRICTION as a
Used in Engineering Design and Construction
function of normal stress.
D6026 Practice for Using Significant Digits in Geotechnical
1.3.3 Test C—Measurement of BULK DENSITY as a func-
Data
tion of normal stress and time.
1.3.4 Test D—Measurement of DEGRADATION as a func-
3. Terminology
tion of normal stress.
3.1 For definitions of technical terms in this standard, refer
1.4 All observed and calculated values shall conform to the
to Terminology D653.
guidelines for significant digits and rounding established in
3.2 Definitions of Terms Specific to This Standard:
Practice D6026.
3.2.1 adhesion—shear stress between the wall coupon and
1.4.1 Theproceduresusedtospecifyhowdataarecollected/
powder at a normal stress of zero.
recorded or calculated in this standard are regarded as the
3.2.2 consolidation normal stress—the maximal normal
industry standard. In addition, they are representative of the
stress applied to the specimen for executing an yield locus.
significant digits that generally should be retained. The proce-
dures used do not consider material variation, purpose for
3.2.3 consolidation step—shearing repeated under the con-
obtaining the data, special purpose studies, or any consider-
solidation normal stress until the shear stress reaches a maxi-
ations for the user’s objectives, and it is common practice to
mum τ value followed by a steady state value τ . This step is
m s
increase or reduce significant digits of reported data to be
performed before each shear step.
commensuratewiththeseconsiderations.Itisbeyondthescope
3.2.4 degradation—change of particle size as result of
of this standard to consider significant digits used in analysis
shearing.
methods for engineering design.
3.2.5 dynamic wall friction—calculated from the measured
1.5 The values stated in SI units are to be regarded as
normal stress and the steady state shear stress after certain
standard. No other units of measurement are included in this
shearing.
standard.
3.2.6 dynamic yield locus—line calculated from measured
values of normal stress and steady values of the shear stress.
1
ThistestmethodisunderthejurisdictionofASTMCommitteeD18onSoiland
Rock and is the direct responsibility of Subcommittee D18.24 on Characterization
2
and Handling of Powders and Bulk Solids. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Oct. 1, 2008. Published October 2008. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2001. Last previous edition approved in 2006 as D6682 – 01 (2006). Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/D6682-08. the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D6682 − 08
shear tester as function of time.
3.2.7 peak shear stress (τ )— maximum shear stress at the
m
beginningofyield-atthetransitionbetweenelasticandplastic
4.1.1 Foreachindividualtest,thepowderiscompactedwith
deformation.
the pre-consolidation normal stress. It is then pretreated by
3.2.8 pre-consolidation normal stress (σ )—normal stress
np applying a shear stress until steady state is achieve
...
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