ASTM B896-10
(Test Method)Standard Test Methods for Evaluating Connectability Characteristics of Electrical Conductor Materials
Standard Test Methods for Evaluating Connectability Characteristics of Electrical Conductor Materials
SIGNIFICANCE AND USE
These test methods develop comparative information useful for the design of stationary contacts for wire, cable, and other conductors.
These test methods produce results, which are free of the influence of arbitrary connection systems.
The influence of conductor surface pretreatments and platings can be evaluated by these test methods.
The influence of environmental factors, such as high temperature and corrosive environment can be evaluated by these test methods.
The results obtained by these test methods provide guidance on connection system design parameters, such as contact force and gas tightness requirements.
SCOPE
1.1 These test methods define procedures for the relative characterization of conductor material connectability on the basis of measurements of parameters important to the design and performance of electrical contacts and connections to and with such conductors for both power and signal applications.
1.2 The parameters measured are contact resistance as a function of contact force, fretting sensitivity, and compressive relaxation.
1.3 Provision is made for measurement of the connectability parameters at elevated temperature, or corrosive ambient, or both, as may be required for evaluation for particular applications.
1.4 These test methods, using standardized specimen geometry and procedures, are applicable to conductor materials as employed in an electrical system and may be adapted for evaluation of connectability of materials in the form of actual connection system components.
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 become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use.
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Designation:B896–10
Standard Test Methods for
Evaluating Connectability Characteristics of Electrical
1
Conductor Materials
This standard is issued under the fixed designation B896; 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 B539 Test Methods for Measuring Resistance of Electrical
Connections (Static Contacts)
1.1 These test methods define procedures for the relative
B542 Terminology Relating to Electrical Contacts and
characterization of conductor material connectability on the
Their Use
basis of measurements of parameters important to the design
and performance of electrical contacts and connections to and
3. Terminology
with such conductors for both power and signal applications.
3.1 Definitions—Definitions of terms used in this test
1.2 The parameters measured are contact resistance as a
method are in accordance with Terminology B542.
function of contact force, fretting sensitivity, and compressive
3.2 Definitions of Terms Specific to This Standard:
relaxation.
3.2.1 connectability, n—a combination of properties deter-
1.3 Provisionismadeformeasurementoftheconnectability
mining the ability of a material to establish and maintain stable
parameters at elevated temperature, or corrosive ambient, or
low resistance electrical contact under the influence of dete-
both, as may be required for evaluation for particular applica-
riorating environmental and operational factors.
tions.
3.2.2 fretting, n—accelerated surface damage occurring at
1.4 These test methods, using standardized specimen geom-
the interface of contacting materials subjected to small oscil-
etry and procedures, are applicable to conductor materials as
latory displacements.
employed in an electrical system and may be adapted for
evaluation of connectability of materials in the form of actual
4. Summary of Test Method
connection system components.
4.1 Contact Resistance—Contact resistance is measured as
1.5 The values stated in SI units are to be regarded as
force is increased between conductors in a crossed-rod contact
standard. No other units of measurement are included in this
pair of the material(s) being tested. Held at the maximum
standard.
specified force, test contacts may be exposed to temperature
1.6 This standard does not purport to address all of the
changes or corrosive environments such as high humidity to
safety concerns, if any, associated with its use. It is the
observe the effects of such conditions on electrical contact
responsibility of the user of this standard to become familiar
resistance.
with all hazards including those identified in the appropriate
4.2 Fretting Sensitivity—Contactresistanceofacrossed-rod
Material Safety Data Sheet (MSDS) for this product/material
pair is measured at constant normal force while a microscopic
as provided by the manufacturer, to establish appropriate
oscillitory tangential motion is applied at the contact interface.
safety and health practices, and determine the applicability of
The number of applied motion cycles required to induce
regulatory limitations prior to use.
contact resistance instability is determined. The test may be
performedatelevatedtemperatureorincorrosiveenvironment.
2. Referenced Documents
2
4.3 Compressive Relaxation—Change of applied contact
2.1 ASTM Standards:
force with time, at fixed engagement displacement of crossed-
wire specimens, is measured. The test may be performed at
1
These test methods are under the jurisdiction of ASTM Committee B02 on
elevated temperature.
Nonferrous Metals and Alloys and are the direct responsibility of Subcommittee
B02.11 on Electrical Contact Test Methods.
5. Significance and Use
Current edition approved Oct. 1, 2010. Published October 2010. Originally
5.1 These test methods develop comparative information
approved in 1999. Last previous edition approved in 2005 as B896 - 99 (2005).
DOI: 10.1520/B0896-10.
useful for the design of stationary contacts for wire, cable, and
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
other conductors.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.2 Thesetestmethodsproduceresults,whicharefreeofthe
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. influence of arbitrary connection systems.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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B896–10
5.3 The influence of conductor surface pretreatments and long-term environmental variables, such as temperature, hu-
pl
...
This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:B896–99(Reapproved2005) Designation:B896–10
Standard Test Methods for
Evaluating Connectability Characteristics of Electrical
1
Conductor Materials
This standard is issued under the fixed designation B896; 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
1.1 These test methods define procedures for the relative characterization of conductor material connectability on the basis of
measurements of parameters important to the design and performance of electrical contacts and connections to and with such
conductors for both power and signal applications.
1.2 The parameters measured are contact resistance as a function of contact force, fretting sensitivity, and compressive
relaxation.
1.3 Provision is made for measurement of the connectability parameters at elevated temperature, or corrosive ambient, or both,
as may be required for evaluation for particular applications.
1.4 These test methods, using standardized specimen geometry and procedures, are applicable to conductor materials as
employed in an electrical connection system and may be adapted for evaluation of connectability of materials in the form of actual
connection system components.
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 become familiar with all hazards including those identified in the appropriate Material Safety Data
Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and
determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
B539 Test Methods for Measuring Resistance of Electrical Connections (Static Contacts)
B542 Terminology Relating to Electrical Contacts and Their Use
3. Terminology
3.1 Definitions—Definitions of terms used in this test method are in accordance with Terminology B542.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 connectability, n—a combination of properties determining the ability of a material to establish and maintain stable low
resistance electrical contact under the influence of deteriorating environmental and operational factors.
3.2.2 fretting, n—accelerated surface damage occurring at the interface of contacting materials subjected to small oscillatory
displacements.
4. Summary of Test Method
4.1 Contact Resistance—Contact resistance is measured as force is increased between conductors in a crossed-rod contact pair
of the material(s) being tested. Held at the maximum specified force, test contacts may be exposed to temperature changes or
corrosive environments such as high humidity to observe the effects of such changesconditions on electrical contact resistance.
4.2 Fretting Sensitivity—Contact resistance of a crossed-rod pair is measured at constant normal force while a microscopic
oscillitory tangential motion is applied at the contact interface. The number of applied motion cycles required to induce contact
resistance instability is determined. The test may be performed at elevated temperature or in corrosive environment.
4.3 Compressive Relaxation—Change of applied contact force with time, at fixed engagement displacement of crossed-wire
specimens, is measured. The test may be performed at elevated temperature.
1
These test methods are under the jurisdiction of ASTM Committee B02 on Nonferrous Metals and Alloys and are the direct responsibility of Subcommittee B02.11 on
Electrical Contact Test Methods.
Current edition approved Nov.Oct. 1, 2005.2010. Published November 2005.October 2010. Originally approved in 1999. Last previous edition approved in 19992005 as
B896 - 99 (2005). DOI: 10.1520/B0896-99R05.10.1520/B0896-10.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
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