ASTM B896-10e1
(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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Standards Content (Sample)
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Designation: B896 − 10
StandardTest Methods for
Evaluating Connectability Characteristics of Electrical
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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.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
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ε NOTE—A Summary of Changes was added editorially in December 2010.
1. Scope* 2. Referenced Documents
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1.1 These test methods define procedures for the relative 2.1 ASTM Standards:
characterization of conductor material connectability on the B539Test Methods for Measuring Resistance of Electrical
basis of measurements of parameters important to the design Connections (Static Contacts)
and performance of electrical contacts and connections to and B542Terminology Relating to Electrical Contacts andTheir
with such conductors for both power and signal applications. Use
1.2 The parameters measured are contact resistance as a
3. Terminology
function of contact force, fretting sensitivity, and compressive
3.1 Definitions—Definitions of terms used in this test
relaxation.
method are in accordance with Terminology B542.
1.3 Provisionismadeformeasurementoftheconnectability
3.2 Definitions of Terms Specific to This Standard:
parameters at elevated temperature, or corrosive ambient, or
3.2.1 connectability, n—a combination of properties deter-
both, as may be required for evaluation for particular applica-
miningtheabilityofamaterialtoestablishandmaintainstable
tions.
low resistance electrical contact under the influence of dete-
1.4 Thesetestmethods,usingstandardizedspecimengeom-
riorating environmental and operational factors.
etry and procedures, are applicable to conductor materials as
3.2.2 fretting, n—accelerated surface damage occurring at
employed in an electrical system and may be adapted for
the interface of contacting materials subjected to small oscil-
evaluation of connectability of materials in the form of actual
latory displacements.
connection system components.
1.5 The values stated in SI units are to be regarded as 4. Summary of Test Method
standard. No other units of measurement are included in this
4.1 Contact Resistance—Contact resistance is measured as
standard.
force is increased between conductors in a crossed-rod contact
1.6 This standard does not purport to address all of the
pair of the material(s) being tested. Held at the maximum
safety concerns, if any, associated with its use. It is the
specified force, test contacts may be exposed to temperature
responsibility of the user of this standard to become familiar
changes or corrosive environments such as high humidity to
with all hazards including those identified in the appropriate
observe the effects of such conditions on electrical contact
Material Safety Data Sheet (MSDS) for this product/material
resistance.
as provided by the manufacturer, to establish appropriate
4.2 Fretting Sensitivity—Contactresistanceofacrossed-rod
safety and health practices, and determine the applicability of
pair is measured at constant normal force while a microscopic
regulatory limitations prior to use.
oscillitory tangential motion is applied at the contact interface.
The number of applied motion cycles required to induce
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These test methods are under the jurisdiction of ASTM Committee B02 on
Nonferrous Metals and Alloys and are the direct responsibility of Subcommittee
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B02.11 on Electrical Contact Test Methods. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Oct. 1, 2010. Published October 2010. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1999. Last previous edition approved in 2005 as B896– 99(2005). Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/B0896-10E01. 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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B896 − 10
contact resistance instability is determined. The test may be with a maximum allowable lateral motion of 0.025 mm.
performedatelevatedtemperatureorincorrosiveenvironment. Contact force is increased until it reaches the lesser of the
following:
4.3 Compressive Relaxation—Change of applied contact
6.3.4.1 120% of the force required to achieve contact
force with time, at fixed engagement displacement of crossed-
resistance of 1.0 mΩ.
wire specimens, is measured. The test may be performed at
6.3.4.2 2.0 kg (for standard specimen diameter).
elevated temperature.
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