1、ASTM D3029 94-0759510 055b735 BTB m Designation:D 3029-94 AMERICAN SOCE-Y FOR TESTING AND MATERIALS 1916 Race St.Philadelphia,Pa 19103 Reprinted from the Annual Book of ASTM Standards.Copyright ASTM If not listed in the current combined index,will appear in the nerd edition.An American National Stan
2、dard Standard Test Methods for Impact Resistance of Flat,Rigid Plastic Specimens by Means of a Tup(Falling Weight)This standard is issued under the fixed designation D 3029;the number immediately following the designation indicates the year of original adoption or,in the case of revision,the year of
3、 last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon(0 indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies ojrhe Department of Dejense.Consult the DOD Index of Speq$carions and Standards
4、/or lhe spec$c year of issue which has been adopred by the Department of DeJense.1.Scope 1.1 These test methods cover the determination of the relative ranking of materials according to the energy required to crack or break flat,rigid plastic specimens under various specified conditions of impact of
5、 a free-falling tup or weight.1.2 The values stated in SI units are to be regarded as the standard.The values given in parentheses are for informa-tion only.1.3 This standard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the user of
6、 this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.Specific hazards statements are given in Section 8.2.Referenced Documents 2.I ASTM Standards:D374 Test Methods for Thickness of Solid Electrical Insulation2 D
7、618 Practice for Conditioning Plastics and Electrical Insulating Materials for Testing3 D 883 Terminology Relating to Plastics3 D 1600 Terminology for Abbreviated Terms Relating to Plastics3 D 1709 Test Methods for impact Resistance of Plastic Film by the Free-Falling Dart Method3 D 1898 Practice fo
8、r Sampling of Plastics3 D 2188 Practice for Statistical Design in Interlaboratory Testing of Plastics4 D2444 Test Method for Impact Resistance of Thermo-plastic Pipe and Fittings by Means of a Tup(Falling Weight)s D 2794 Test Method for Resistance of Organic Coatings to the Effects of Rapid Deformat
9、ion(lmpact)h D 4000 Classification System for Specifying Plastic Materials7 r These test methods are under the jurisdiction of ASTM Committee D-20 on Plastics and are the diren responsibility of Subcommittee D20.10 on Mechanical Properties.Current edition approved June 15,1994.Published August 1994.
10、Originally published as D 3029-72.Last previous edition D 3029-93.2 Annual Book qf ASTM Siandards,Vol 10.0 I.3 Annual Book of ASTM Smndards,Vol 08.01.4 Discontinued,1982 see Annual Book of ASTM Standards,Vol 08.02.5 Annual Book oJASTM S:andard.y,Vol 08.04.6 Annual Book oJASTM Sfandards.Vol 06.0 I.1
11、Annual Book oJASTM Slandards,Vol 08.02.D4066 Specification for Nylon Injection and Extrusion Materials7 E 17 1 Specification for Standard Atmospheres for Condi-tioning and Testing Materials*E I77 Practice for Use of the Terms Precision and Bias in ASTM Test Methods9 E 69 1 Practice for Conducting an
12、 Interlaboratory Study to Determine the Precision of a Test Method9 3.Terminology 3.1 Definitions-For definitions of plastic terms used in these test methods,see Terminology D 883 and Terminology D 1600.3.2 Descriptions of Terms Specific to This Standard:3.2.1 failure(of test specimen)-the presence
13、of any crack or split created by the impact of the falling tup,that can be seen by the naked eye under normal laboratory lighting conditions.3.2.2 mean failure energy(mean impact resistance)-the energy required to produce 50%failures,equal to the product of the drop height and the mean-failure weigh
14、t,or the product of the constant weight and mean failure height.3.2.3 mean failure height(impact failure height)-the height at which a standard weight,when dropped on test specimens,will cause 50%failures.3.2.4 mean failure weight(impact failure weig/rt)-the weight of tup that,when dropped on test s
15、pecimens from a standard height,will cause 50%of them to fail.3.2.5 tup-See 7.2 and Fig.3.NOTE I-Cracks usually start at the surface opposite the one that is struck.Occasionally incipient cracking in glass-reinforced polymers,for example,may be difficult to differentiate from the reinforcing fibers.
16、In such cases,a penetrating dye may be used to confirm the onset of crack formation.4.Summary of Test Methods 4.1 Two basically different test methods,F and G,are described.These differ in the design of the machine and method of holding and striking the specimen.Each test method has characteristics that may dictate its use.4.2 In Test Method F(Sections 7 to 15),a free-falling dart(tup)is allowed to strike a supported specimen directly.Either a dart having a fixed weight may be dropped from vario
