Standard Test Method for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials by Four-Point Bending

Importancia y uso:

5.1 Flexural properties determined by this test method are especially useful for quality control and specification purposes.

5.2 This test method is recommended for those materials that do not fail within the strain limits imposed by Test Method D790. The major difference between four point and three point bending modes is the location of the maximum bending moment and maximum axial fiber stress. In four point bending the maximum axial fiber stress is uniformly distributed between the loading noses. In three point bending the maximum axial fiber stress is located immediately under the loading nose.

5.3 Flexural properties vary with specimen depth, temperature, atmospheric conditions, and the difference in rate of straining specified in Procedures A and B.

5.4 Before proceeding with this test method, reference the specification of the material being tested. Any test specimen preparation, conditioning, dimensions, or testing parameters covered in the material specification, or both, shall take precedence over those mentioned in this test method. If there are no material specifications, then these default conditions apply. Table 1 in Classification D4000 lists the ASTM materials standards that currently exist.

Subcomité:

D20.10

Referida por:

D7264_D7264M-21, D2990-17, D7774-22, D0790-17, D0790-17, D4762-23, D0790-17, D0790-17

Volúmen:

08.03

Número ICS:

29.035.20 (Plastic and rubber insulating materials), 83.080.01 (Plastics in general)

Palabras clave:

flexural properties; four point bending; plastics; stiffness; strength;