ASTM C203块状绝热材料的断裂负荷和弯曲性的试验方法

ASTM C203 Standard Test Methods for Breaking Load and Flexural Properties of Block-Type Thermal Insulation
ASTM C203 块状绝热材料的断裂负荷和弯曲性的试验方法

1. Scope
1.1 These test methods cover the determination of the breaking load and calculated flexural strength of a rectangular cross section of a preformed block-type thermal insulation tested as a simple beam. It is also applicable to cellular plastics. Two test methods are described as follows:
1.1.1 Test Method I— A loading system utilizing center loading on a simply supported beam, supported at both ends.
1.1.2 Test Method II— A loading system utilizing two symmetric load points equally spaced from their adjacent support points at each end with a distance between load points of one half of the support span.
1.2 Either test method is capable of being used with the four procedures that follow:
1.2.1 Procedure A— Designed principally for materials that break at comparatively small deflections.
1.2.2 Procedure B— Designed particularly for those materials that undergo large deflections during testing.
1.2.3 Procedure C— Designed for measuring at a constant stress rate, using a CRL (constant rate of loading) machine. Used for breaking load measurements only.
1.2.4 Procedure D— Designed for measurements at a constant crosshead speed, using either a CRT (constant rate of traverse) or CRE (constant rate of extension) machine. Used for breaking load measurements using a fixed crosshead speed machine.
1.3 Comparative tests are capable of being run according to either method or procedure, provided that the method or procedure is found satisfactory for the material being tested.
1.4 These test methods are purposely general in order to accommodate the widely varying industry practices. It is important that the user consult the appropriate materials specification for any specific detailed requirements regarding these test methods.
1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are provided for information only.
1.6 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 and health practices and determine the applicability of regulatory limitations prior to use. For specific precautionary statements, see Section 11.

2. Referenced Documents (purchase separately)
ASTM Standards
ASTM C133 Test Methods for Cold Crushing Strength and Modulus of Rupture of Refractories
ASTM C168 Terminology Relating to Thermal Insulation
ASTM C390 Practice for Sampling and Acceptance of Preformed Thermal Insulation Lots
ASTM C870 Practice for Conditioning of Thermal Insulating Materials
ASTM D76 Specification for Tensile Testing Machines for Textiles
ASTM E4 Practice for Force Verification of Testing Machines
Index Terms
breaking load; breaking strength; flexural strength; modulus of
elasticity; modulus of rupture

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 來源：防火網　發布時間：12/17/2013 點擊次數：1222