The legends for all of the stress and strain results are all the same,
and are included in this table also. Notice that the stress results are
of von Mises stress, and the contour intervals are as defined by the
strain-hardening model step intervals. The equivalent plastic strain
results, denoted PEEQ in the Abaqus finite element results output, are
displayed in this paper using a logarithmic scale.
FEA modelling
The finite element model comprises only a small part of the overall
geometry, but included significantly geometry than is shown the results
images. The sketch suggested in Figure 2(c) is not drawn to scale, but
it does represent the mirror symmetry on the left hand side edge, and
the applied loading, as distributed pressure, on the upper and lower
surfaces. In addition, minimal boundary conditions were applied to
satisfy the rigid body requirement, without any additional constraint.
The element mesh size in the region of interest was very fine. This was
to satisfy the need to represent a finely graded surface roughness
profile, the varying sizes of pores, and the need to represent the
stress-strain state to a good degree of fidelity. Away from the region
of interest, a much coarser mesh was sufficient, and to ensure a
suitably smoothly graded mesh transition a systematic approach to
geometry partitioning was employed. This approach has been described by
the authors in more detail in a previous work [63].
Table 2. Model information.