Finite element analysis of the indentation test on rocks with microstructure
Jean Sulem (ENPC-CERMES), Miguel Cerrolaza
TL;DR
This paper presents a finite element analysis of rock indentation tests considering microstructure, revealing how scale effects influence the response based on the size of the indentor relative to the internal length.
Contribution
It introduces a finite element model incorporating Cosserat microstructure to analyze scale effects in rock indentation tests.
Findings
Indentation response varies with the ratio of indentor size to internal length.
The model captures scale effects due to microstructure.
Results inform more accurate strength parameter estimation.
Abstract
Strength parameters of rocks are currently determined from indentation tests. In this paper, a finite element analysis of this test is presented and scale effect is studied. The rock is modelled as an elasto-plastic medium with Cosserat microstructure and consequently possesses an internal length. The response of the indentation curve is studied for various values of the size of the indentor as compared to the internal length of the rock in order to assess the scale effect.
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