ASTM D1828-2001(2013) Standard Practice for Atmospheric Exposure of Adhesive-Bonded Joints and Structures《胶粘剂粘接接口和结构耐候性的标准实施规程》.pdf
《ASTM D1828-2001(2013) Standard Practice for Atmospheric Exposure of Adhesive-Bonded Joints and Structures《胶粘剂粘接接口和结构耐候性的标准实施规程》.pdf》由会员分享,可在线阅读,更多相关《ASTM D1828-2001(2013) Standard Practice for Atmospheric Exposure of Adhesive-Bonded Joints and Structures《胶粘剂粘接接口和结构耐候性的标准实施规程》.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D1828 01 (Reapproved 2013)Standard Practice forAtmospheric Exposure of Adhesive-Bonded Joints andStructures1This standard is issued under the fixed designation D1828; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、 year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice covers the procedure for the direct expo-sure of adhesive bonded joints and structures to natur
3、alatmospheric environments.1.2 The procedure for sheltered atmospheric exposure, suchas a Stevenson screen (1),2of adhesive-bonded joints andspecimens is the same except for the requirements of facingsouth and measurement of solar radiation.1.3 This practice is limited to the procedure by whichsampl
4、es are exposed and does not cover the tests that may beused to evaluate the effects of atmospheric exposure on theseadhesive-bonded joints and structures. These samples could beany one of several varieties.1.3.1 A complete structure for test,1.3.2 A section of a structure for test,1.3.3 A complete s
5、tructure or section with strength obser-vations on specimens cut therefrom,1.3.4 Test specimens themselves, or1.3.5 Any of the above, mounted under stress.1.4 Suitable test methods for evaluation of the effects ofexposure include nondestructive qualitative or quantitativeobservations on the same sam
6、ple at prescribed intervals, ordestructive tests on separate sets of specimens in accordancewith such tests as Test Method D1002.NOTE 1See Test Methods D896 and D897.1.5 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.6 This
7、standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility 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
8、.1 ASTM Standards:3D896 Practice for Resistance of Adhesive Bonds to Chemi-cal ReagentsD897 Test Method for Tensile Properties of Adhesive BondsD907 Terminology of AdhesivesD1002 Test Method for Apparent Shear Strength of Single-Lap-Joint Adhesively Bonded Metal Specimens by Ten-sion Loading (Metal-
9、to-Metal)2.2 ASTM Adjuncts:ASTM Standard Racks and Pipe Frames Blueprints43. Terminology3.1 Definitions:3.1.1 Many terms used in this practice are defined inTerminology D907.4. Significance and Use4.1 The atmospheric exposure tests described in this prac-tice will evaluate the stability of the adhes
10、ive bond only interms of a particular natural atmosphere. Since the atmosphericconditions vary greatly from year to year, these results will notbe as reproducible as those derived from laboratory agingprocedures. Considerable research has shown that laboratoryartificial weathering tests will not giv
11、e consistently goodcorrelation with outdoor test exposures (2, 3, 4).5. Exposure Sites5.1 The choice of exposure sites is dependent upon theobjective of the particular test program.5.2 In the cases of both metallic and nonmetallic adherends,choose exposure sites to include variations in average temp
12、era-ture (and temperature range), relative humidity, and precipita-tion.1This practice is under the jurisdiction of ASTM Committee D14 on Adhesivesand is the direct responsibility of Subcommittee D14.40 on Adhesives for Plastics.Current edition approved July 1, 2013. Published July 2013. Originally
13、approvedin 1961. Last previous edition approved in 2007 as D1828 01 (2007). DOI:10.1520/D1828-01R13.2The boldface numbers in parentheses refer to the list of references at the end ofthis practice.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at
14、 serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.4Blueprints of ASTM standard racks and pipe frames may be obtained fromASTM International Headquarters. Order Adjunct No. ADJD1828. Original adjunctproduced in 1957.
15、Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16. Apparatus6.1 RacksExpose the sample on racks4which are sopositioned that the exposed surfaces are at an angle of 45 tothe horizontal and facing true south. Exceptions to the direction
16、that the specimens face will be permitted in the case of beachexposures, where the specimens usually face parallel to thebeach. Place racks on a supporting frame high enough and soconstructed that there will be no background for a distance ofat least 30 cm (11.8 in.) in any direction from the back o
17、fspecimens mounted on them. When the frame is positioned onsoil, ensure that the distance between the bottom edge of anyspecimen and the plane of the cleared area great enough toprevent any undesirable effects of grass or plant growth duringthe period of exposure. In case of roof exposure, ensure th
18、atsurrounding walls do not shade the specimens or impede the airflow over them. Design the racks that samples or specimenswill be affixed directly to the rack by means of a clampingdevice made of an inert, insulating material that will allowthem to expand or contract with thermal and humidity change
19、s.6.2 Climatological InstrumentsIf detailed information isnecessary, operate instruments suitable for determining aver-age daily temperature, average daily relative humidity, andtotal daily rainfall at or near each of the exposure sites (6, 7, 8).If such instruments are available at some already exi
20、stinginstallation or U. S. Weather Bureau Station in the vicinity ofany site, the records from these are to be considered satisfac-tory (Note 2). If complete characterization of climatologicalconditions is necessary (for transparent adherends, forinstance), make a record of total daily solar radiati
21、on, reportedMJ/m2(langleys) (Note 3).NOTE 2Weather may vary appreciably at two locations only arelatively short distance apart. It must be established to the satisfaction ofthe operator that no significant error will be introduced by usingclimatological data from a site other than the exposure site.
22、NOTE 3A pyrheliometer in conjunction with a recording potentiom-eter has been found suitable for recording solar radiation (9).7. Test Specimens7.1 In cases where quantitative evaluation is to be made onspecimens cut or machined from the exposed sample, preparethe specimen in accordance with the spe
23、cific test method.Recognize that this is not as severe a test as when the specimenedges have been exposed before evaluation. In cases where itis desired to know the effect of the exposure on exposed edges,expose test specimens rather than samples prior to testing.Where specimens are cut from an expo
24、sed sample, record therelative location of the specimens in the sample, as effects thatdepend on the distance of the specimen from the exposed edgeof the sample have been noted.7.2 Provide for the number of specimens required by eachtest method plus at least one additional specimen for each testmeth
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