are especially useful for quality control and speci?cation
purposes.
5.2 Materials that do not fail by the maximum strain
allowed under these test methods (3-point bend) may be more
suited to a 4-point bend test. The basic difference between the
two test methods is in the location of the maximum bending
moment and maximum axial ?ber stresses.The maximum axial
?ber stressesoccur on a line under th