Abstract The compressive behaviour of sandwich panels with lattice truss core filled by shear thickening fluid (SPLTC-STF) at high strain-rates is performed analytically and numerically. Firstly, a hydrodynamic constitutive model for the shear thickening fluid (STF) involving shear thinning, shear thickening, and hydrostatic compressibility is undertaken to describe the dynamic behaviour of the STF. Then an analytical model based on the squeezing flow of viscous fluids is proposed. The squeezing resistance of the STF between the two panels of the SPLTC under various loading velocities is analysed using a fluid-structure interaction (FSI) simulation, by which the constitutive parameters of the STF are obtained. Finally, the dynamic response of the SPLTC-STF involving buckling and post-buckling of core struts in the STF is investigated using the FSI method. The enhanced energy absorption capacity of the SPLTC-STF observed in Ref [1] is numerically interpreted. The effects of shear thickening behaviour of STF on the dynamic response of SPLTC-STF are predicted, providing a method of optimal design for STF filled sandwich panels over a wide range of impulse loadings for dynamic energy absorption.

中文翻译：

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剪切稠化液填充网格桁架芯夹芯板的动态压缩行为

摘要 用剪切增稠流体 (SPLTC-STF) 填充格子桁架芯的夹芯板在高应变率下的压缩行为通过分析和数值计算得出。首先，采用剪切稠化流体 (STF) 的流体动力学本构模型，包括剪切稀化、剪切稠化和流体静力压缩性，以描述 STF 的动态行为。然后提出了一种基于粘性流体挤压流动的分析模型。使用流固耦合（FSI）模拟分析了不同加载速度下 SPLTC 两个面板之间 STF 的挤压阻力，通过该模拟获得了 STF 的本构参数。最后，使用 FSI 方法研究了 SPLTC-STF 的动态响应，包括 STF 中核心支柱的屈曲和后屈曲。在参考文献 [1] 中观察到的 SPLTC-STF 增强的能量吸收能力得到了数值解释。预测了 STF 的剪切增稠行为对 SPLTC-STF 动态响应的影响，为 STF 填充夹层板在广泛的脉冲载荷范围内提供了一种优化设计方法，以实现动态能量吸收。