ABSTRACT

In this study, the bending behavior of novel magnesium alloy facesheet and 3D-printed polylactic acid (PLA) lattice core sandwich panels with enhanced interface adhesion has been investigated by joint experiment and simulation method. A reliable numerical model for predicting three-point bending behavior of hybrid sandwich panels was developed and an explicit finite element analysis using ABAQUS/Explicit with a self-written VUMAT user subroutine was conducted. Meanwhile, hybrid sandwich panels were evaluated experimentally by three-point bending tests in order to validate the results obtained in the FEA. The comparison results have shown that the FEA predictions are consistent with the experimental tests. The bending resistance of the hybrid PLA core/Mg alloy composite sandwich panel is better than that of the integrated PLA sandwich panel. Among the four lattice geometries studied, namely body-centered cubic (BCC), BCC with gradient distribution of struts (BCCG), BCC with vertical struts connecting all nodes (BCCV), and face and body centered cubic unit cell with vertical struts (F₂BCCZ), the sandwich structure with BCCV lattice cores has the better bending bearing capacity. The core configuration and core density have a coupling effect on the bending properties and failure modes of the hybrid sandwich panels.

摘要

在这项研究中，通过联合实验和模拟方法研究了新型镁合金面板和具有增强界面粘附力的 3D 打印聚乳酸 (PLA) 晶格夹芯板的弯曲行为。开发了一个可靠的预测混合夹芯板三点弯曲行为的数值模型，并使用 ABAQUS/Explicit 和一个自写的 VUMAT 用户子程序进行了显式有限元分析。同时，通过三点弯曲试验对混合夹芯板进行了实验评估，以验证 FEA 中获得的结果。比较结果表明，有限元分析预测与实验测试一致。复合PLA芯材/镁合金复合夹芯板的抗弯性能优于一体化PLA夹芯板。₂ BCCZ），具有BCCV格芯的夹层结构具有更好的抗弯能力。芯材配置和芯材密度对混合夹芯板的弯曲性能和失效模式具有耦合作用。