ASTM D1780-2005 Standard Practice for Conducting Creep Tests of Metal-to-Metal Adhesives《进行金属间胶粘剂蠕变试验的标准实施规程》.pdf
《ASTM D1780-2005 Standard Practice for Conducting Creep Tests of Metal-to-Metal Adhesives《进行金属间胶粘剂蠕变试验的标准实施规程》.pdf》由会员分享,可在线阅读,更多相关《ASTM D1780-2005 Standard Practice for Conducting Creep Tests of Metal-to-Metal Adhesives《进行金属间胶粘剂蠕变试验的标准实施规程》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 1780 05Standard Practice forConducting Creep Tests of Metal-to-Metal Adhesives1This standard is issued under the fixed designation D 1780; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A
2、number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This practice covers the determination of the amount
3、ofcreep of metal-to-metal adhesive bonds due to the combinedeffects of temperature, tensile shear stress, and time.NOTE 1Since the characteristics that render a material resistant tocreep under the condition of test are not yet completely known, the detailsof the procedure considered herein are thos
4、e known to have importantinfluences. Since other equally important characteristics may be discov-ered in the future, the recommended details are largely advisory in nature.1.2 Test periods depend upon the reasonable life expectedfrom the material in service. The uncertainties of extrapolationshould
5、be considered in deciding upon the length of the test.1.3 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is therespon
6、sibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 907 Terminology of AdhesivesD 1002 Test Method for Apparent Shear Strength of Single-Lap-Jo
7、int Adhesively Bonded Metal Specimens by Ten-sion Loading (Metal-to-Metal)3. Terminology3.1 DefinitionsMany of the terms in this practice aredefined in Terminology D 907.3.2 Descriptions of Terms Specific to This Standard:3.2.1 creep, nthe time-dependent part of the strain thatresults from exposure
8、to a constant temperature and load (Note2). That is, the creep at a given elapsed time is equal to the totalstrain at the given time minus the instantaneous strain (Note 3)on loading. The creep extension is expressed as a percentage,that is, the extension divided by the initial unstretched lengthmul
9、tiplied by 100.NOTE 2Constant-stress creep tests are desirable. The usual one is aconstant deadweight load test. Creep tests made by means of springloading or fixtures which involve deflection or strain measurements in thefixture for the application of load are unsatisfactory. However, if the totald
10、eformation or extension in the adhesive is large, corrections must bemade to compensate for the decrease in stress because of the extension inthe adhesive.NOTE 3Since the time-dependent strain develops rapidly even duringthe application of the load, the instantaneous strain for recovery is usuallydi
11、fficult to determine, except in the arbitrary manner given in thedefinitions of instantaneous strain and instantaneous recovery.3.2.2 deformation, nthe total strain at any specific time.3.2.3 failure, nrupture of the specimen, or exceeding thestrain requirements of a specific design.3.2.4 instantane
12、ous recovery, nthe decrease in strainoccurring immediately upon unloading a specimen. As ininstantaneous strain, a more reproducible value is obtained ifthe decrease in strain is measured after a given small incrementof time (such as 1 min) following unloading. The increment oftime used shall be spe
13、cified. The instantaneous recovery shallbe expressed in the same units as strain, that is, the decrease inlength divided by the gage length usually, in inches per inch.3.2.5 instantaneous strain, nthe strain occurring immedi-ately upon loading a creep specimen. Since it is nearlyimpossible to obtain
14、 strain readings at the instant of loading,the strain after a given small increment of time (such as 1 min)after loading is a more reproducible value. The increment oftime used shall be specified. The instantaneous strain shall beexpressed in the units as strain, that is, the extension divided bythe
15、 gage length, usually in inches per inch.3.2.6 recovery, nthe time-dependent portion of the de-crease in strain following unloading of a specimen at the sameconstant temperature as the initial test. Recovery is equal to thetotal decrease in strain minus the instantaneous recovery (see1This practice
16、is under the jurisdiction of ASTM Committee D14 on Adhesivesand is the direct responsibility of Subcommittee D14.80 on Metal BondingAdhesives.Current edition approved April 1, 2005. Published April 2005. Originallyapproved in 1960. Last previous edition approved in 1999 as D 1780 99.2For referenced
17、ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Consh
18、ohocken, PA 19428-2959, United States.Note 3). The recovery shall be expressed in the same units asinstantaneous recovery.4. Significance and Use4.1 This practice provides information on the creep ofbonded metal parts subjected to combined effects of tempera-ture, shear, and time.5. Possibilities an
19、d Limitations5.1 The primary use of creep tests is to provide basic datafor the choice of safe working stresses for applications inwhich allowable deformation within the service life of thestructure is the criterion of failure.5.2 Creep is an extremely sensitive index of strength, andusually does no
20、t vary as a linear function of stress. (It dependson the material, stress, temperature, and time.)5.3 In the application of the following test requirements andrecommendations it is assumed that the test specimens of agiven adhesive bond are essentially comparable and trulyrepresentative of the mater
21、ial. In tests conducted to show theeffects of temperature or stress as variables, great care must beused to ensure that the specimens are representative of theadhesive bond. Departure from this assumption may introducediscrepancies as great as, if not greater than, those due todeparture from details
22、 of procedure outlined in this practice.6. Apparatus6.1 Testing Machine, capable of producing a tensile load onthe specimen at the rate indicated in 10.2 and consisting of thefollowing:6.1.1 Fixed MemberA fixed or essentially stationarymember, carrying one grip.6.1.2 Movable MemberA movable member,
23、carrying asecond grip.6.1.3 GripsThe grips, designed to minimize eccentricloading of the specimen. A swivel or universal joint near eachend of the specimen is desirable wherever possible.6.2 MicroscopeA calibrated microscope having a Filarmicrometer eyepiece and a 103 objective lens.7. Temperature C
24、ontrol and Measurement7.1 For tests at a particular temperature, maintain thespecimen at a constant temperature, preferably by a suitableautomatic control device. Where a furnace or cold box is used,it is desirable to locate this unit in a constant-temperature roomto aid in temperature control.7.2 T
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