Abstract In this study, an energy absorption lattice, comprised of multiple tetra-beam-plate unit cells with negative stiffness, was designed, fabricated by selective laser sintering method, and analyzed both numerically and experimentally. Snap-through behavior of the unit cell developed due to negative stiffness caused by geometric nonlinearity from large deflection of the constituent elastic beams, resulting in energy absorption. A criterion for the unit cell to achieve the snap-through behavior was investigated numerically in terms of the beam slenderness ratio and the inclined angle. This approach was chosen to facilitate control of energy dissipation performance and further design space such as tuning force threshold. The unit cell with the selected geometric parameters was then created and used to construct the energy absorption lattice. Load-displacement relationships of the lattices obtained from cyclic loading tests disclosed an area enclosed by two distinct loading and unloading curves, which indicates energy dissipation. This was shown both numerically and experimentally. Drop tests were also performed to investigate energy loss of the lattices due to an impact. An energy absorption phenomenon was revealed by observing a reduced rebound height when the lattice exhibited the snap-through behavior.

中文翻译：

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通过快速通过行为表现出能量吸收的晶格的设计、制造和分析

摘要 在本研究中，设计了一种由多个负刚度四梁板单元组成的能量吸收晶格，采用选择性激光烧结方法制造，并进行了数值和实验分析。由于构成弹性梁的大挠度引起的几何非线性引起的负刚度导致单元格的快速通过行为，从而导致能量吸收。就梁长细比和倾斜角而言，以数值方式研究了晶胞实现快速通过行为的标准。选择这种方法是为了便于控制能量耗散性能和进一步的设计空间，例如调整力阈值。然后创建具有选定几何参数的晶胞并用于构建能量吸收晶格。从循环加载试验中获得的晶格的载荷-位移关系揭示了由两条不同的加载和卸载曲线包围的区域，这表明能量耗散。这在数字和实验上都得到了证明。还进行了跌落测试以研究由于撞击而造成的晶格能量损失。当晶格表现出快速通过行为时，通过观察回弹高度降低，揭示了能量吸收现象。