# [LEGACY] Multiaxial Control with Constant Load Rate

This example (`tutorials/triaxCLR`

) covers the triaxial deformation of a dual phase FCC/BCC polycrystal (phase map shown below) at a constant load rate followed by a dwell episode and subsequent unloading. Loads are applied normal to the surface, maintaining proportional macroscopic load ratios of \(-0.375\):\(-0.625\):\(1\) for the \(x\):\(y\):\(z\) directions, respectively. Load tolerance options are prescribed. The primary loading direction is set to be in the \(z\) direction, and a dwell episode is initiated on the second step. Elemental critical resolved shear stresses and equivalent strains are output, along with the nodal coordinates and surface-integrated forces. Material parameters are those for the austenitic (\(\gamma\)) and ferritic (\(\alpha\)) phases of an LDX-2101 steel, and are provided in the tables below. Illustrations of the results are provided in the figures below.

Phase |
Type |
\(C_{11}\) [MPa] |
\(C_{12}\) [MPa] |
\(C_{44}\) [MPa] |
---|---|---|---|---|

\(\gamma\) |
FCC |
\(204.6 \times 10^3\) |
\(137.7 \times 10^3\) |
\(126.2 \times 10^3\) |

\(\alpha\) |
BCC |
\(236.9 \times 10^3\) |
\(140.6 \times 10^3\) |
\(116.0 \times 10^3\) |

Phase |
\(m\) [-] |
\(\dot{\gamma_{0}}\) [1/s] |
\(h_{0}\) [MPa] |
\(g_{0}\) [MPa] |
\(g_{s0}\) [MPa] |
\(n\) [-] |
---|---|---|---|---|---|---|

\(\gamma,\alpha\) |
0.02 |
1.0 |
391.9 |
200.0 |
335.0 |
1.0 |