Assessing the mechanical properties of a rock using indentation tests

Instrumented indentation devices allow testing of materials at small scales (micro and nanoindentation). In this framework, IFPEN has developed a new indentation system under confining conditions: this is a lightweight tool called Mechanicalab, which can perform simultaneously uniaxial strain test and indentation tests with a 7 mm diameter flat indenter. This paper describes the tests carried out on clayey silt Transinne Kaolin, Belgium) under different moisture contents both with this new equipment and with standard geomechanical devices (triaxial tests and uniaxial strain tests). Furthermore, indentation tests are carried out with the Mechanicalab and a classical indentation device working under atmospheric conditions.