Behaviour of materials subjected to simple beam loading. It is also called a transverse beam test with some materials.
Specimen is supported on two knife edges as a simple beam and load is applied at its midpoint. Maximum fibre stress and maximum strain are calculated for increments of load. Results are plotted in a stress-strain diagram, and maximum fibre stress at failure is flexural strength.
Flexural yield strength is reported for materials that do not crack.
ASTM D790 - Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials
ASTM D2990 - Standard Test Methods for Tensile, Compressive, and Flexural Creep and Creep-Rupture of Plastics
ASTM D797 - Test Method for Rubber Property-Young's Modulus at Normal and Subnormal Temperatures
ISO 178:2010 - Plastics - Determination of flexural properties
See also: Flexural Strength.