Simulation and optimization for blast-resistant performances of pyramidal lattice cored sandwich panels

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (16) : 245-252.

QI Chang HAO Pengcheng SHU Jian YANG Shu

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Abstract

Metal lattice sandwich structures have great potential in the field of engineering protection owing to its lightweight, high strength, high specific stiffness characteristics and excellent multifunctional applications and designablity. In this work, based on the explicit finite element (FE) method, the dynamic responses of the pyramidal metallic lattice sandwich panels (PLSPs) under blast loading were simulated, and the multi-objective optimization for their blast-resistant performances was carried out. Firstly, a detailed FE model of the sandwich panel containing a solid-element model of the lattice core was established, and a simplified beam-element model was proposed. Secondly, the effectiveness and accuracy of the models were verified by referring to the experimental results in literature. By using the simplified model, the influences of key geometric parameters on the blast-resistant performances of the sandwich panels were analyzed based on the single variable method in terms of areal specific energy absorption (ASEA) and maximum back face deflection (MaxD). Then, based on radial basis function (RBF) response surface models and by using the non-dominated sorting genetic algorithm (NSGA-II), multi-objective design optimizations (MDO) were conducted to maximize ASEA and minimize MaxD with the key geometric parameters as design variables. Lastly, the reliability-based optimization of the blast-resistant performances of the sandwich panels was performed considering blast load uncertainty. The results show that using a simplified beam-element model of the lattice core greatly improves simulation efficiency and facilitates the optimization process. Key geometric parameters have great influences on the blast-resistant performances of the PLSPs. MDO and reliability-based optimization of PLSPs could improve their comprehensive blast-resistant performances and reliability.

Key words

sandwich panel / lattice material / blast-resistant performance / response surface model / multi-objective optimization

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QI Chang HAO Pengcheng SHU Jian YANG Shu . Simulation and optimization for blast-resistant performances of pyramidal lattice cored sandwich panels[J]. Journal of Vibration and Shock, 2019, 38(16): 245-252

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