ASTM D2344 is a standard test method used to evaluate the short-beam strength of fiber-reinforced composite materials, particularly laminates. It measures the material’s resistance to interlaminar shear failure using a short-beam three-point bending test. 

ASTM D2344/D2344M-22: Standard Test Method for Short-Beam Strength of Polymer Matrix Composite Materials and Their Laminates

This test method determines the short-beam strength of high-modulus fiber-reinforced composite materials. The specimen is a short beam machined from a curved or a flat laminate up to 6.00 mm [0.25 in.] thick. The beam is loaded in three-point bending.

Application of this test method is limited to continuous- or discontinuous-fiber-reinforced polymer matrix composites, for which the elastic properties are balanced and symmetric with respect to the longitudinal axis of the beam.

Test procedure: The thickness and width of the test specimen are measured before conditioning. The specimen is placed on a horizontal shear test fixture so that the fibers are parallel to the loading nose. The loading nose is then used to flex the specimen at a speed of .05 inches per minute until breakage. The force is then recorded. Calculations are performed to determine shear strength.

Specimen size: The test specimens are machined from flat, finished composites.

ASTM D2344 Shear Test Loading conditions: 

Loading speed: a constant speed of 1-2 mm/min for continuous loading of 56.

Stop conditions: load drops by 30%, specimen breaks, or displacement exceeds nominal thickness by 10.

Strength calculation: According to the maximum load at break P_max, specimen width b, and thickness h, the shear strength of the short beam is calculated using the formula: 

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