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# Introduction

IMPETUS Solver provides a framework for custom material models through dynamic-link library (DLL) or shared object files under Linux. Users can compile their own user-defined materials, which are then linked to the software at the start of a simulation. This approach offers several advantages, including seamless compatibility with any version of the software, provided there have been no major changes to the interface.

Users can take advantage of the latest software updates without requiring significant modifications to their custom material models. By incorporating specialized knowledge and expertise into their simulations, users can leverage proprietary material properties or complex constitutive relationships that may not be readily available in standard material models.

The ability to link up to eight user-defined material models also provides flexibility in modeling complex systems comprising diverse materials. This feature enables users to tailor the solver’s behavior to meet specific simulation requirements, thereby increasing its overall utility and effectiveness.

## Licence

This IMPETUS User material package and documentation are released under the MIT License.

    MIT License

    Copyright (c) 2024 IMPETUS

    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in all
    copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    SOFTWARE.