For specimens tested in three and four point bending which w

For specimens tested in three and four point bending, which would exhibit higher strength and why?

Solution

Among three and four point bend tests , In Four bend Test Loading is provided in major portion of the specimen which in turn produces maximum bending stress. so more volume of the material subjected to high stress so high internal resistence(high strength) is exhibited in order to overcome external Load So material exhibits high strength

And also same loading through some portion of material it will make us reliable to estimate chances of finding number and severity of flaws exposed to the maximum stress is directly related to the flexural strength and crack initiation especially in case of BRITTLE material.