ON THE RELATIONSHIP BETWEEN 3-POINT AND 4-POINT BENDING TESTS OF CERAMICS

This paper verifies an expression, which is rarely mentioned in textbooks, relating the results of 3-point and 4-point bending tests of ceramic materials on fracture strength with the experimental data obtained by Katayama. The expression is shown to be of satisfactory accuracy. The load factor for 4-point bending test, whose derivation is usually not included in textbooks, is also derived in this paper.