According to many reports published on the impact strength of rocks, the Page impact test is usually adopted, while the impact flexure test is seldom used.
The authors have designed a Charpy-type flexure testing machine with a small impact energy, 0.02kg·m, in order to make it possible to test such a brittle material as rock, and have carried out the tests with this machine on sandstone, marble and granite.
The results obtained show that this method affords a possible means of determining the impact strength of rocks.