ASTM D1709-2016ae1 Standard Test Methods for Impact Resistance of Plastic Film by the Free-Falling Dart Method《采用自由落镖法测定塑料薄膜耐冲击性的标准试验方法》.pdf
《ASTM D1709-2016ae1 Standard Test Methods for Impact Resistance of Plastic Film by the Free-Falling Dart Method《采用自由落镖法测定塑料薄膜耐冲击性的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D1709-2016ae1 Standard Test Methods for Impact Resistance of Plastic Film by the Free-Falling Dart Method《采用自由落镖法测定塑料薄膜耐冲击性的标准试验方法》.pdf(10页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D1709 16a1Standard Test Methods forImpact Resistance of Plastic Film by the Free-Falling DartMethod1This standard is issued under the fixed designation D1709; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of
2、 last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1NOTEEditorially corrected Fig. 1 in April
3、2017.1. Scope*1.1 These test methods cover the determination of theenergy that causes plastic film to fail under specified conditionsof impact of a free-falling dart. This energy is expressed interms of the weight (mass) of the missile falling from aspecified height which would result in 50 % failur
4、e of speci-mens tested.1.2 Two test methods are described:1.2.1 Test Method A employs a dart with a38.10 6 0.13-mm (1.500 6 0.005-in.) diameter hemisphericalhead dropped from a height of 0.66 6 0.01 m (26.0 6 0.4 in.).This test method can be used for films whose impact resis-tances require masses of
5、 about 50 g or less to about 6 kg tofracture them.1.2.2 Test Method B employs a dart with a50.80 6 0.13-mm (2.000 6 0.005-in.) diameter hemisphericalhead dropped from a height of 1.52 6 0.03 m (60.0 + 0.25,1.70 in.). Its range of applicability is from about 0.3 kg toabout 6 kg.1.3 Two testing techni
6、ques are described:1.3.1 The standard technique is the staircase method. Bythis technique, the missile weight employed during the test isdecreased or increased by uniform increments after the testingof each specimen, depending upon the result (fail or not fail)observed for the specimen.1.3.2 The alt
7、ernative technique provides for testing speci-mens in successive groups of ten. One missile weight isemployed for each group and the missile weight is varied inuniform increments from group to group.1.3.3 The staircase technique and the alternative techniquegive equivalent results both as to the val
8、ues of impact failureweight which are obtained and as to the precisions with whichthey are determined.1.4 The values stated in SI units are to be regarded asstandard. The values stated in parentheses are for informationonly.NOTE 1Tests on materials that do not break, for any reason, are notconsidere
9、d to be valid. It has been noted that certain materials may stretchso far as to bottom out at the base of certain test instruments withoutactually rupturing. Subcommittee D20.19 is currently considering meth-ods for testing these materials.Anyone interested in participating in a TaskGroup should con
10、tact the Chairman of Subcommittee D20.19 throughASTM International Headquarters.1.5 This standard does not purport to address the safetyconcerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine th
11、e applicability of regulatorylimitations prior to use.NOTE 2Film has been arbitrarily defined as sheeting having nominalthickness not greater than 0.25 mm (0.010 in.).NOTE 3This test method is technically equivalent to ISO 7765-1:1988, with the exception of a larger tolerance on the drop height in T
12、estMethod B, smaller tolerances on the dart diameters for Test Methods Aand B, and the requirement for a vented dart well in 5.1.1. Also, the ISOmethod does not allow the alternative testing technique described inSection 11 of this test method.1.6 This international standard was developed in accor-d
13、ance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM S
14、tandards:2D618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to PlasticsD1248 Specification for Polyethylene Plastics ExtrusionMaterials for Wire and Cable1These test methods are under the jurisdiction of ASTM Committee D20 onPlastics and are the direct responsibility of Su
15、bcommittee D20.19 on Film, Sheeting,and Molded Products.Current edition approved May 1, 2016. Published May 2016. Originallyapproved in 1959. Last previous edition approved in 2016 as D1709 16. DOI:10.1520/D1709-16AE1.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact AS
16、TM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshoh
17、ocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organ
18、ization Technical Barriers to Trade (TBT) Committee.1D3420 Test Method for Pendulum Impact Resistance ofPlastic FilmD4272 Test Method for Total Energy Impact of Plastic Filmsby Dart DropD6988 Guide for Determination of Thickness of Plastic FilmTest SpecimensE177 Practice for Use of the Terms Precisi
19、on and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 ISO Standard:ISO 7765:1988 Plastic Film and SheetingDeterminationof Impact Resistance by the Free Falling Dart MethodPart 1: Staircase Method33. Terminology3.1 Definitio
20、nsFor definitions related to plastics, see Ter-minology D883.3.2 Definitions of Terms Specific to This Standard:3.2.1 failureany break through the film that can be ob-served readily by feeling or by viewing the specimen underbacklighted condition.3.2.2 impact failure weightthat missile weight, estim
21、atedstatistically, at which 50 % of the specimens would fail in thespecified test.3.2.3 missile weightthe weight (mass) of the dart plus thetotal value of incremental weights attached plus the lockingcollar.4. Significance and Use4.1 Test MethodsAand B are used to establish the weight ofthe dart whe
22、n 50 % of the specimens fail under the conditionsspecified. Data obtained by one test method cannot be com-pared directly with the other test method nor with thoseobtained from tests employing different conditions of missilevelocity, impinging surface diameter, effective specimendiameter, material c
23、onstruction and finish of the dart head, andfilm thickness. The values obtained by these test variables arehighly dependent on the method of film fabrication.4.2 The results obtained by Test Methods A and B aregreatly influenced by the quality of film under test. Theconfidence limits of data obtaine
24、d by this procedure can,therefore, vary significantly, depending on the sample quality,uniformity of film gage, die marks, contaminants, etc. (seeSection 15).4.3 Test Methods A and B have been found useful forspecification purposes.NOTE 4With sufficient data, correlation between test results and fie
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