ASTM E2769 - 22

1.1 This test method describes the use of linear controlled-rate-of-loading in three-point bending to determine the elastic modulus of isotropic specimens in the form of rectangular bars using a thermomechanical analyzer (TMA).Note 1: This method is intended to provide results similar to those of Test Methods D790 or D5934 but is performed on a thermomechanical analyzer using smaller test specimens. Until the user demonstrates equivalence, the results of this method shall be considered independent and unrelated to those of Test Methods D790 or D5934.1.2 This test method provides a means for determining the elastic modulus within the linear region of the stress-strain curves (see Fig. 1). This test is conducted under isothermal temperature conditions from –100 °C to 300 °C.FIG. 1 Stress-Strain Curve (Linear Region) 1.3 Typical test specimens are in the form of thin strips 0.5?mm in thickness, 1.5?mm in width, and 6?mm in length. The size of the test specimen is limited by the distance