ASTM D1709-2016 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 D1709-2016 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 D1709-2016 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(9页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D1709 16Standard 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 l
2、ast 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.1. Scope*1.1 These test methods cover the det
3、ermination 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 % failure of speci-mens tested.1.2 Two test methods are de
4、scribed: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 about 50 g or less to about 6 kg tofracture them.
5、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 techniques are described:1.3.1 The standard technique is
6、 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 alternative technique provides for testing speci-mens
7、 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 values of impact failureweight which are obtained and
8、 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 notconsidered to be valid. It has been noted that certain mate
9、rials 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 contact the Chairman of Subcommittee D20.19 throughAS
10、TM 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 the applicability of regulatorylimitations prior to
11、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 TestMethod B, smaller tolerances on the dart diamet
12、ers 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.2. Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD883 Termino
13、logy Relating to PlasticsD1248 Specification for Polyethylene Plastics ExtrusionMaterials for Wire and CableD3420 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 FilmT
14、est SpecimensE177 Practice for Use of the Terms Precision and Bias inASTM Test Methods1These test methods are under the jurisdiction of ASTM Committee D20 onPlastics and are the direct responsibility of Subcommittee D20.19 on Film, Sheeting,and Molded Products.Current edition approved April 15, 2016
15、. Published April 2016. Originallyapproved in 1959. Last previous edition approved in 2015 as D1709 15a. DOI:10.1520/D1709-16.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information,
16、 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 Conshohocken, PA 19428-2959. United States1E691 Practice for Conducting an Interlaboratory Study to
17、Determine 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 DefinitionsFor definitions related to plastics, see Ter-minology D883.3.2 Definitions of Terms S
18、pecific 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, estimatedstatistically, at which 50 % of the specimens would fail in thespecified test.3.2.3
19、 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 when 50 % of the specimens fail under the conditionsspecified. Data obtained by one test m
20、ethod 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 construction and finish of the dart head, andfilm thickness. The values obtained by thes
21、e 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 obtained by this procedure can,therefore, vary significantly, depending on the sample quality,
22、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 fieldperformance can usually be established.4.4 The impact resistance of plastic film, whi
23、le partlydependent on thickness, has no simple correlation with samplethickness. Hence, impact values cannot be normalized over arange of thickness without producing misleading data as to theactual impact resistance of the material. Data from these testmethods are comparable only for specimens that
24、vary by nomore than 625 % from the nominal or average thickness of thespecimens tested.4.5 Several impact test methods are used for film. It issometimes desirable to know the relationships among testresults derived by different test methods. A study was con-ducted in which four films made from two r
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
本资源只提供5页预览,全部文档请下载后查看!喜欢就下载吧,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ASTMD17092016STANDARDTESTMETHODSFORIMPACTRESISTANCEOFPLASTICFILMBYTHEFREEFALLINGDARTMETHOD 采用 自由 落镖法
![提示](http://www.mydoc123.com/images/bang_tan.gif)
链接地址:http://www.mydoc123.com/p-510331.html