Investigations on the Experimental Setup for Testing the Centric Tensile Strength According to ASTM C307 of Mineral-based Materials

Abstract

Centric tensile tests often exhibit high standard deviations due to various factors, hence various test setups have been developed in the past. Based on the specifications in ASTM C307-18, the experimental setup was further developed to reduce the standard deviation resulting from the test setup itself and thus to obtain reliable, reproducible test results. Furthermore, it has been investigated, whether the test setup is suitable for materials of low strength. In the further developed experimental setup three mineral-based materials with tensile strengths in the range of 0.4 to 5.9 MPa were examined and compared to ASTM C307-18. For this purpose, the optical 3D-measurement system ARAMIS® and a positioning adapter designed for the specimen geometry were used to validate and verify the developed experimental setup and to ensure a consistent position of the specimen.  For the low strength mineral-based materials tensile strength tests could be implemented and recommendations for the test parameters test speed, preload and required number of specimens could be developed.