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2、03Standard Test Method forMixed Mode I-Mode II Interlaminar Fracture Toughness ofUnidirectional Fiber Reinforced Polymer Matrix Composites1This standard is issued under the fixed designation D 6671/D 6671M; the number immediately following the designation indicates the year of original adoption or,
3、in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method describes the determination of inter- laminar fracture toughne
4、ss, Gc, of continuous fiber-reinforced composite materials at various Mode I to Mode II loading ratios using the Mixed-Mode Bending (MMB) Test.1.2 This test method is limited to use with composites consisting of unidirectional carbon fiber tape laminates with brittle and tough single-phase polymer m
5、atrices. This test method is further limited to the determination of fracture toughness as it initiates from a delamination insert. This limited scope reflects the experience gained in round robin testing. This test method may prove useful for other types of toughness values and for other classes of
6、 composite materials; however, certain interferences have been noted (see Section 6). This test method has been successfully used to test the toughness of both glass fiber composites and adhesive joints.1.3 The values stated in either SI units or inch-pound units are to be regarded separately as sta
7、ndard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.1.4 This standard does not purport to address all of the safety concerns, if an
8、y, 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 regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards: 2D 883 Terminology Relating to PlasticsD 2651 G
9、uide for Preparation of Metal Surfaces for Adhe- sive Bonding1 This test method is under the jurisdiction of ASTM Committee D30 on Composite Materials and is the direct responsibility of Subcommittee D30.06 on Interlaminar Properties.Current edition approved Jan. 10, 2003. Published April 2004. Orig
10、inally approved in 2001. Last previous edition approved in 2001 as D 6671 01.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standards volume information, refer to the standards Document Summary page o
11、n the ASTM website.D 2734 Test Methods for Void Content of Reinforced Plas-ticsD 3171 Test Methods for Constituent Content of CompositeMaterialsD 3878 Terminology for Composite MaterialsD 5229/D 5229M Test Method for Moisture Absorption Properties and Equilibrium Conditioning of Polymer Ma- trix Com
12、posite MaterialsD 5528 Test Method for Mode I Interlaminar Fracture Toughness of Unidirectional Fiber-Reinforced Polymer Matrix CompositesE 4 Practices for Force Verification of Testing MachinesE 6 Terminology Relating to Methods of Mechanical Test- ingE 122 Practice for Calculating Sample Size to E
13、stimate, With a Specified Tolerable Error, the Average for a Characteristic of a Lot or ProcessE 177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE 456 Terminology Relating to Quality and Statistics3. Terminology3.1 Terminology D 3878 defines terms relating to high- modulus fi
14、bers and their composites. Terminology D 883 defines terms relating to plastics. Terminology E 6 defines terms relating to mechanical testing. Terminology E 456 and Practice E 177 define terms relating to statistics. In the event of conflict between terms, Terminology D 3878 shall have prece- dence
15、over the other terminology standards.3.2 Definitions of Terms Specific to This Standard:3.2.1 crack opening mode (Mode I)fracture mode in which the delamination faces open away from each other and no relative crack face sliding occurs.3.2.2 crack sliding mode (Mode II)fracture mode in which the delamination faces slide over each other in the direction of delamination growt
