Aluminum alloy lattice-grid sandwich cylinders, comprising a symmetric pyramidal truss core and open grid face-sheets, are additively manufactured using the selective laser melting method. The compression behaviors of these sandwich cylinders are investigated. Failure is controlled by three competing mechanisms: global buckling, core shear instability and grid buckling, with the active failure mode determined by the cylinder geometry and the material yield stress. Failure criteria are defined in terms of the effective elastoplastic properties of the grid-skins and core, which agree well with the measured and simulated failure responses, and are applied to generate multi-failure maps with cylinder geometrical parameters as axes. The maps help with failure load prediction and design optimization. For these cylinders, grid buckling is proposed as the dominant failure mode.

中文翻译：

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增材制造的格子栅格夹芯圆柱体和弹塑性多失效分析


铝合金晶格夹芯圆柱体由对称的金字塔形桁架芯和开放式网格面板组成，采用选择性激光熔化法增材制造。研究了这些夹层圆柱体的压缩行为。失效由三种竞争机制控制： 整体屈曲、型芯剪切不稳定和网格屈曲，主动失效模式由圆柱体几何形状和材料屈服应力决定。失效准则是根据网格蒙皮和型芯的有效弹塑性特性定义的，这与测量和模拟的失效响应非常吻合，并应用于生成以圆柱体几何参数为轴的多失效图。这些地图有助于故障负载预测和设计优化。对于这些圆柱体，网格屈曲被认为是主要的失效模式。