ASTM F428-2009 Standard Test Method for Intensity of Scratches on Aerospace Glass Enclosures《航空航天用玻璃外壳抗划痕硬度的标准试验方法》.pdf
《ASTM F428-2009 Standard Test Method for Intensity of Scratches on Aerospace Glass Enclosures《航空航天用玻璃外壳抗划痕硬度的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM F428-2009 Standard Test Method for Intensity of Scratches on Aerospace Glass Enclosures《航空航天用玻璃外壳抗划痕硬度的标准试验方法》.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: F 428 09Standard Test Method forIntensity of Scratches on Aerospace Glass Enclosures1This standard is issued under the fixed designation F 428; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision.
2、 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 test method covers the visual inspection ofscratches on the glass surface of aerospace transparent enclo-sures.1.2 The values s
3、tated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.3 This standard may involve hazardous materials, opera-tions, and equipment. This standard does not purport toaddress all of the safety concerns, if any, associated with itsuse. It is the re
4、sponsibility of the user of this standard toestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.2. Referenced Documents2.1 Other Standards:2Glass Scratch Visual Comparison Standard3. Summary of Test Method3.1 A visual comparison i
5、s made between a set of gradedscratch standards and the scratch on the glass aerospacetransparency to determine the relative intensity of the scratch.4. Significance and Use4.1 Scratches exist on all glass surfaces. Often there are veryfine scratches from cleaning operations that are not visiblewhen
6、 looking through the glass. Visible scratches may bedistracting to the observer looking through the transparency.Therefore, a procedure to define the severity scratches isuseful. A visual standard is used because it is not practical tomeasure the dimensions of the fine scratches in the scope ofthis
7、test method.5. Reference Materials5.1 Glass Scratch Visual Comparison Standard consists of aset of six hermetically sealed glass plates 38 mm square withscratches of graded intensity on the inside surface. The lightestscratch is identified as ASTM F 428-3 and the heaviest asASTM F 428-8.36. Procedur
8、e6.1 Place the part in a suitable inspection position. This maybe horizontal on a padded table, vertical against a neutral todark background, or at an angle simulating the installedposition. The scratched surface shall be toward the observer.The light level shall be a minimum of 80 lux. Either natur
9、al orartificial light may be used. If possible, move the light until thescratch has the highest contrast against the background. Placethe scratch in the visual comparison standard beside andparallel to the scratch in question. Rotate the part or viewingangle to get the best definition of the scratch
10、. Disregarding thelength of the scratch on the part and on the standard, select andrecord the standard that most closely matches the appearanceof the scratch on the part. Measure and record the length of thescratch to the nearest 1 mm.7. Interpretation7.1 Customer specifications for aerospace glass
11、surfacedtransparent enclosures may detail allowable frequency, loca-tion, length, and ASTM standard scratch number for scratchesand they may assign maximum scratch limits for critical andnoncritical optical viewing areas.1This test method is under the jurisdiction of ASTM Committee F07 onAerospace a
12、nd Aircraft and is the direct responsibility of Subcommittee F07.08 onTransparent Enclosures and Materials.Current edition approved May 15, 2009. Published June 2009. Originallypublished in 1977. Last previous edition approved in 2003 as F 428 03a.2The sole source of supply of the Glass Scratch Visu
13、al Comparison Standardknown to the committee at this time is Davidson Optronics, Inc., 2223 RamonaBlvd., West Covina, CA 91790. If you are aware of alternative suppliers, pleaseprovide this information to ASTM International Headquarters. Your comments willreceive careful consideration at a meeting o
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- ASTMF4282009STANDARDTESTMETHODFORINTENSITYOFSCRATCHESONAEROSPACEGLASSENCLOSURES 航空航天 玻璃 外壳 划痕 硬度 标准 试验
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