Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Finite element analysis of the indentation test on rocks with
  microstructure   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.

15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph