聚酰胺12功能梯度负刚度蜂窝粘弹性及吸能特性的数值与实验研究

IF 2.1 4区材料科学 Q3 MATERIALS SCIENCE, COMPOSITES

Plastics, Rubber and Composites Pub Date : 2023-06-06 DOI:10.1080/14658011.2023.2219083

M. Shafipour, S. Y. Ahmadi-Brooghani

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引用次数: 0

摘要

摘要:本研究研究了聚酰胺12 (PA12)制成的功能梯度负刚度(FGNS)蜂窝对增加能量吸收的影响。此外，在有限元(FE)模型中实施了PA12的粘弹性模型，以证明这些结构的可恢复性。首先，对恒厚负刚度(CTNS)蜂窝和FGNS蜂窝进行了准静态压缩试验。然后，对这两种结构的有限元模型进行了仿真。利用应力松弛试验，推导了PA12粘弹性的proony级数系数。将CTNS和FGNS蜂窝的粘弹性模拟结果与实验结果进行了比较。对比结果表明，在加载和卸载阶段均具有较好的一致性。此外，本研究还采用了评价FGNS蜂窝结构吸能的关键参数和常规参数。实验和数值结果表明，FGNS蜂窝的性能优于CTNS。

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Numerical and experimental study of viscoelastic properties and energy absorption of functionally graded negative stiffness honeycomb made of Polyamide 12

ABSTRACT This study investigated the effect of a functionally graded negative stiffness (FGNS) honeycomb made from polyamide 12 (PA12) on increasing energy absorption. In addition, the viscoelastic model of PA12 was implemented in the finite element (FE) model to demonstrate the recoverability of these structures. First, a quasi-static compression test was performed on constant thickness negative stiffness (CTNS) honeycomb and FGNS honeycomb. Then, these two structures’ FE models were simulated. The stress relaxation test was utilised to derive Prony series coefficients for PA12 viscoelastic properties. The results of viscoelastic simulation for CTNS and FGNS honeycombs were then compared with experimental results. The comparison demonstrated a good agreement in both the loading and unloading stages. Furthermore, the critical parameters for evaluating the structural energy absorption of the FGNS honeycomb and the conventional ones were used in this study. According to the results, the FGNS honeycomb outperformed the CTNS experimentally and numerically.

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来源期刊

Plastics, Rubber and Composites 工程技术-材料科学：复合

CiteScore

4.10

自引率

0.00%

发文量

审稿时长

4 months

期刊介绍： Plastics, Rubber and Composites: Macromolecular Engineering provides an international forum for the publication of original, peer-reviewed research on the macromolecular engineering of polymeric and related materials and polymer matrix composites. Modern polymer processing is increasingly focused on macromolecular engineering: the manipulation of structure at the molecular scale to control properties and fitness for purpose of the final component. Intimately linked to this are the objectives of predicting properties in the context of an optimised design and of establishing robust processing routes and process control systems allowing the desired properties to be achieved reliably.