Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Apex control within an elasto-plastic constitutive model for confined
  concretes   This work focuses on the numerical modelling of confined concretes when
subjected to multiaxial loading accounting for a nonlinear material response.
Particularly, an improved return mapping procedure is here presented to cope
with the issue of singularities (corners) in the yield surface, able to catch
locally the optimal return point on the active yield surface. The algorithm is
applied to the Menetry and Willam's yield surface, with a plastic potential as
suggested by Grassl and the softening law proposed by Cervenka suitable for
concrete materials. The model capabilities to reproduce the confined behaviour
of concrete, as well as its post-peak behaviour, and to predict perfect
plasticity or softening are here discussed. The proposed approach can be
applied to any elastoplastic material with singular yield surface along the
hydrostatic axis.

37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph