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Standard Test Method for Flexural Properties of Polymer Matrix Composite MaterialsPřeložit název
NORMA vydána dne 1.1.2021
Označení normy: ASTM D7264/D7264M-21
Datum vydání normy: 1.1.2021
Kód zboží: NS-1018261
Počet stran: 10
Přibližná hmotnost: 30 g (0.07 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
fiber-reinforced composites, flexural properties, stiffness, strength,, ICS Number Code 83.120 (Reinforced plastics)
|Significance and Use|
5.1This test method determines the flexural properties (including strength, stiffness, and load/deflection behavior) of polymer matrix composite materials under the conditions defined. Procedure A is used for three-point loading and Procedure B is used for four-point loading. This test method was developed for optimum use with continuous-fiber-reinforced polymer matrix composites and differs in several respects from other flexure methods, including the use of a standard span-to-thickness ratio of 32:1 versus the 16:1 ratio used by Test Methods D790 (a plastics-focused method covering three-point flexure) and D6272 (a plastics-focused method covering four-point flexure).
5.2This test method is intended to interrogate long-beam strength in contrast to the short-beam strength evaluated by Test Method D2344/D2344M.
5.3Flexural properties determined by these procedures can be used for quality control and specification purposes, and may find design applications.
5.4These procedures can be useful in the evaluation of multiple environmental conditions to determine which are design drivers and may require further testing.
5.5These procedures may also be used to determine flexural properties of structures.
1.1This test method determines the flexural stiffness and strength properties of polymer matrix composites.
1.1.1Procedure AA three-point loading system utilizing center loading on a simply supported beam.
1.1.2Procedure BA 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 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-half the support span.
1.2For comparison purposes, tests may be conducted according to either test procedure, provided that the same procedure is used for all tests, since the two procedures generally give slightly different property values.
1.3UnitsThe 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.
1.4This 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.
1.5This 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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