聚脲涂覆三维负泊松比点阵夹层结构在碰撞冲击作用下的动态响应试验

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (17) : 259-270.

论文

黄秀峰，张振华，巫继航

作者信息 +

Dynamic response tests of polyurea-coated 3-D lattice sandwich structure with negative Poisson’s ratio under impact load

HUANG Xiufeng, ZHANG Zhenhua, WU Jihang

Author information +

文章历史 +

摘要

针对四面内凹金字塔型负泊松比点阵夹层结构在有无聚脲涂覆两种情况下的抗冲击力学性能进行了研究。采用增材制造方法制作负泊松比点阵结构，通过长直杆冲击试验得到负泊松比点阵夹层结构在碰撞载荷作用下的变形过程、吸能特性和破坏模式。试验结果表明：涂覆聚脲可使该型负泊松比点阵夹层结构提高17%以上的总吸能，增强结构的整体抗冲击能力，显著降低前面板的内凹变形，有效避免芯层大范围的坍塌破坏。相比于未涂覆聚脲模型，涂覆聚脲的负泊松比点阵夹层结构在受冲后保持完整，芯层仍具有承载能力，表现为塑性弯曲变形。

Abstract

Here, anti-impact mechanical properties of four sides concave pyramidal lattice sandwich structure with negative Poisson’s ratio and with or without polyurea coating were studied.The lattice structure with negative Poisson’s ratio was fabricated using the additive manufacturing method.Deformation process, energy absorption characteristics and failure mode of lattice sandwich structure with negative Poisson’s ratio under impact load were obtained with long straight bar impact tests.The test results showed that polyurea coating can increase total energy absorption of lattice sandwich structure with negative Poisson’s ratio by more than 17%, enhance its overall anti-impact ability, significantly reduce concave deformation of its front panel, and effectively avoid large-scale collapse of its core layer; compared with the model without polyurea coated, the polyurea coated lattice sandwich structure with negative Poisson’s ratio remains intact after impact, and its core layer still has the load-bearing capacity to reveal plastic bending deformation.

导出引用

黄秀峰，张振华，巫继航. 聚脲涂覆三维负泊松比点阵夹层结构在碰撞冲击作用下的动态响应试验[J]. 振动与冲击, 2021, 40(17): 259-270

HUANG Xiufeng, ZHANG Zhenhua, WU Jihang. Dynamic response tests of polyurea-coated 3-D lattice sandwich structure with negative Poisson’s ratio under impact load[J]. Journal of Vibration and Shock, 2021, 40(17): 259-270

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