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Standard Test Method for Determination of the Mode II Interlaminar Fracture Toughness of Unidirectional Fiber-Reinforced Polymer Matrix Composites (Includes all amendments and changes 11/6/2019).Přeložit název
NORMA vydána dne 15.3.2019
Označení normy: ASTM D7905/D7905M-19e1
Datum vydání normy: 15.3.2019
Kód zboží: NS-975164
Počet stran: 18
Přibližná hmotnost: 54 g (0.12 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
composite materials, delamination, end notched flexure, ENF, interlaminar fracture toughness, mode II, shear,, ICS Number Code 83.080.01 (Plastics in general)
|Significance and Use|
5.1 Susceptibility to delamination is one of the major design concerns for many advanced laminated composite structures. Knowledge of a laminated composite material’s resistance to interlaminar fracture is useful for product development and material selection. Furthermore, a measurement of the mode II interlaminar fracture toughness that is independent of specimen geometry or method of force introduction is useful for establishing design allowables used in damage tolerance analyses of composite structures. Knowledge of both the non-precracked and precracked toughnesses allows the appropriate value to be used for the application of interest.
5.2 This test method can serve the following purposes:
5.2.1 To establish quantitatively the effect of fiber surface treatment, local variations in fiber volume fraction, and processing and environmental variables on 5.2.2 To compare quantitatively the relative values of GIIc for composite materials with different constituents;
5.2.3 To compare quantitatively the values of 5.2.4 To develop delamination failure criteria for composite damage tolerance and durability analyses.
1.1 This test method covers the determination of the mode II interlaminar fracture toughness, FIG. 1 ENF Test Fixture and Specimen Nomenclature
1.2 This method is limited to use with composites consisting of unidirectional carbon-fiber- and glass-fiber-reinforced laminates. This limited scope reflects the experience gained in round robin testing. This test method may prove useful for other types and classes of composite materials; however, certain interferences have been noted (see Section 6).
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.
1.3.1 Within the text the inch-pound units are shown in brackets.
1.4 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 this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
|2. Referenced Documents|
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