Mechanical metamaterials have gained a lot of research interest over the last years due to their unusual mechanical properties and potential use for structural applications. However, the design and analysis of mechanical metamaterials remains challenging and time-consuming. Herein, we present a software framework for automated generation, finite element modeling and analysis of extruded mechanical metamaterials based on simple closed curves. By generalizing extruded unit cells with pores defined by simple closed curves, a wide variety of existing and novel metamaterials can be created and analyzed. Each pore can either be empty or filled with one or more materials, resulting in single- or multi-material metamaterials. Since part of the mechanical response of a metamaterial is defined by the geometric parameters of a unit cell, parameter studies are directly integrated into the framework. Examples of well-established mechanical metamaterials were used as benchmark structures and compared to their analytical solutions. We also demonstrate how generalized curves can further improve the mechanical properties of these structures, for example the load bearing capabilities and range of Poisson's ratios. Furthermore, newly developed single- and multi-material designs of mechanical metamaterials with tunable Poisson's ratio are presented and analyzed with the proposed framework. The framework is implemented in Python, executed via ABAQUS and allows for unit-cell based homogenization and full-size 2D and 3D simulations. The scripts are made open source and publicly available.

中文翻译：

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MetamaterialFinder：基于简单闭合曲线发现和分析机械超材料的软件框架

机械超材料由于其不同寻常的机械性能和在结构应用中的潜在用途，在过去几年中引起了广泛的研究兴趣。然而，机械超材料的设计和分析仍然充满挑战且耗时。在此，我们提出了一个基于简单闭合曲线的挤压机械超材料的自动生成、有限元建模和分析的软件框架。通过概括具有由简单闭合曲线定义的孔的挤压晶胞，可以创建和分析各种现有的和新型的超材料。每个孔隙可以是空的，也可以填充一种或多种材料，从而形成单材料或多材料超材料。由于超材料的部分机械响应是由晶胞的几何参数定义的，因此参数研究直接集成到框架中。成熟的机械超材料示例被用作基准结构，并与其分析解决方案进行比较。我们还演示了广义曲线如何进一步提高这些结构的机械性能，例如承载能力和泊松比范围。此外，还使用所提出的框架介绍并分析了新开发的具有可调泊松比的机械超材料的单材料和多材料设计。该框架用 Python 实现，通过 ABAQUS 执行，并允许基于单元的均质化以及全尺寸 2D 和 3D 模拟。这些脚本是开源的并可供公众使用。