astm-d-7264-樹脂基復合材料彎曲性能測試標準方法

1、Designation: D7264/D7264M – 07Standard Test Method for Flexural Properties of Polymer Matrix Composite Materials1This standard is issued under the fixed designation D7264/D7264M; the number immediately following the desi

2、gnation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (´) indicates an editorial

3、 change since the last revision or reapproval.1. Scope1.1 This test method determines the flexural stiffness and strength properties of polymer matrix composites. 1.1.1 Procedure A—A three-point loading system utilizing

4、center loading on a simply supported beam. 1.1.2 Procedure B—A four-point loading system utilizing two load points equally spaced from their adjacent support points, with a distance between load points of one-half of the

5、 support span.NOTE 1—Unlike Test Method D6272, which allows loading at both one-third and one-half of the support span, in order to standardize geometry and simplify calculations this standard permits loading at only one

6、-half the support span.1.2 For comparison purposes, tests may be conducted ac- cording to either test procedure, provided that the same procedure is used for all tests, since the two procedures generally give slightly di

7、fferent property values. 1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the inch-pound units are shown in brackets. The values stated in each syst

8、em are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. 1.4 This standard does not purport to ad

9、dress all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety and health practices and determine the applica- bility of regulat

10、ory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D790 Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating MaterialsD2344/D2344M Test Method for Sh

11、ort-Beam Strength of Polymer Matrix Composite Materials and Their LaminatesD3878 Terminology for Composite Materials D5229/D5229M Test Method for Moisture Absorption Properties and Equilibrium Conditioning of Polymer Ma-

12、 trix Composite MaterialsD5687/D5687M Guide for Preparation of Flat Composite Panels with Processing Guidelines for Specimen Prepara- tionD6272 Test Method for Flexural Properties of Unreinforced and Reinforced Plastics

13、and Electrical Insulating Materials by Four-Point BendingD6856 Guide for Testing Fabric-Reinforced “Textile” Com- posite MaterialsE4 Practices for Force Verification of Testing Machines E6 Terminology Relating to Methods

14、 of Mechanical Testing E18 Test Methods for Rockwell Hardness of Metallic Ma- terialsE122 Practice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot or ProcessE1

15、77 Practice for Use of the Terms Precision and Bias in ASTM Test MethodsE456 Terminology Relating to Quality and Statistics E1309 Guide for Identification of Fiber-Reinforced Polymer-Matrix Composite Materials in Databas

16、esE1434 Guide for Recording Mechanical Test Data of Fiber- Reinforced Composite Materials in Databases2.2 Other Documents:ANSI Y14.5-1999 Dimensioning and Tolerancing— Includes Inch and Metric3ANSI B46.1-1995 Surface Tex

17、ture (Surface Roughness, Waviness and Lay)33. Terminology3.1 Definitions—Terminology D3878 defines the terms re- lating to high-modulus fibers and their composites. Terminol- ogy E6 defines terms relating to mechanical t

18、esting. Terminol- ogy E456 and Practice E177 define terms relating to statistics. In the event of a conflict between terms, Terminology D3878 shall have precedence over the other documents.1 This test method is under the

19、 jurisdiction of ASTM Committee D30 on Composite Materials and is the direct responsibility of Subcommittee D30.04 on Lamina and Laminate Test Methods. Current edition approved April 1, 2007. Published April 2007. Origin

20、ally approved in 2006. Last previous edition approved in 2006 as D7264/D7264M – 06. DOI: 10.1520/D7264_D7264M-07. 2 For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at

21、 service@astm.org. For Annual Book of ASTM Standards volume information, refer to the standard’s Document Summary page on the ASTM website.3 Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4t

22、h Floor, New York, NY 10036, http://www.ansi.org.1Copyright © ASTM International, 100 Barr Harbou r Dr. P.O. Box C-700, West Conshohocken, Pennsylvania 19428-2959, United States6.2 For multidirectional laminates wit

23、h a small or moderate number of laminae, flexural modulus and flexural strength may be affected by the ply-stacking sequence and will not neces- sarily correlate with extensional modulus, which is not stacking-sequence d

24、ependent. 6.3 The calculation of the flexural properties in Section 13of this standard is based on beam theory, while the specimens in general may be described as plates. The differences may in some cases be significant,

25、 particularly for laminates containing a large number of plies in the 645° direction. The deviations from beam theory decrease with decreasing width. 6.4 Loading noses may be fixed, rotatable or rolling. Typi- cally

26、, for testing composites, fixed or rotatable loading noses are used. The type of loading nose can affect results, since non-rolling paired supports on either the tension or compres- sion side of the specimen introduce sl

27、ight longitudinal forces and resisting moments on the beam, which superpose with the intended loading. The type of supports used is to be reported as described in Section 14. The loading noses should also uniformly conta

28、ct the specimen across its width. Lack ofuniform contact can affect flexural properties by initiating damage by crushing and by non-uniformly loading the beam. Formulas used in this standard assume a uniform line loading

29、 at the specimen supports across the entire specimen width; deviations from this type of loading is beyond the scope of this standard.7. Apparatus7.1 Testing Machine—Properly calibrated, which can be operated at a consta

30、nt rate of crosshead motion, and in which the error in the force application system shall not exceed 61 % of the full scale. The force indicating mechanism shall be essentially free of inertia lag at the crosshead rate u

31、sed. Inertia lag shall not exceed 1 % of the measured force. The accuracy of the testing machine shall be verified in accordance with Practices E4. 7.2 Loading Noses and Supports—The loading noses and supports shall have

32、 cylindrical contact surfaces of radius 3.00 mm [0.125 in.] as shown in Fig. 3, with a hardness of 60 to 62 HRC, as specified in Test Methods E18, and shall have finelyFIG. 3 Example Loading Nose and Supports for Procedu