Metamaterials produced using additive manufacturing represent advanced structures with tunable properties and deformation characteristics. However, the manufacturing process, imperfections in geometry, properties of the base material as well as the ambient and operating conditions often result in complex multiparametric dependence of the mechanical response. As the lattice structures are metamaterials that can be tailored for energy absorption applications and impact protection, the investigation of the coupled thermomechanical response and ambient temperature‐dependent properties is particularly important. Herein, the 2D re‐entrant honeycomb auxetic lattice structures additively manufactured from powdered stainless steel are subjected to high strain rate uniaxial compression using split Hopkinson pressure bar (SHPB) at two different strain rates and three different temperatures. An in‐house developed cooling and heating stages are used to control the temperature of the specimen subjected to high strain rate impact loading. Thermal imaging and high‐speed cameras are used to inspect the specimens during the impact. It is shown that the stress–strain response as well as the crushing behavior of the investigated lattice structures are strongly dependent on both initial temperature and strain rate.

中文翻译：

---

增材制造的不锈钢辅助结构在高温和低温下的冲击行为

使用增材制造生产的超材料代表了具有可调整特性和变形特性的先进结构。但是，制造过程，几何形状的缺陷，基材的性能以及环境和操作条件通常会导致机械响应的复杂多参数依赖性。由于晶格结构是可以针对能量吸收应用和冲击防护进行定制的超材料，因此研究热机械响应与环境温度相关的特性尤其重要。在这里 使用粉末状的霍普金森压力棒（SHPB）在两种不同的应变速率和三种不同的温度下，对由粉末状不锈钢相加制成的2D凹入蜂窝状蜂巢状晶格结构进行高应变率单轴压缩。内部开发的冷却和加热阶段用于控制承受高应变率冲击载荷的样品温度。在撞击过程中，使用热成像和高速摄像机检查样本。结果表明，所研究的晶格结构的应力-应变响应以及压碎行为都与初始温度和应变率密切相关。内部开发的冷却和加热阶段用于控制承受高应变率冲击载荷的样品温度。在撞击过程中，使用热成像和高速摄像机检查样本。结果表明，所研究的晶格结构的应力-应变响应以及压碎行为都与初始温度和应变率密切相关。内部开发的冷却和加热阶段用于控制承受高应变率冲击载荷的样品温度。在撞击过程中，使用热成像和高速摄像机检查样本。结果表明，所研究的晶格结构的应力-应变响应以及压碎行为都与初始温度和应变率密切相关。