Dynamic compressive behavior and constitutive model of polyamide-6 at different temperatures and strain rates

IF 2.3 3区工程技术 Q2 MECHANICS

Acta Mechanica Pub Date : 2024-06-22 DOI:10.1007/s00707-024-03997-w

Bingqiang Zhang, Qiaoguo Wu, Lei Zu, Baozhen Wang, Qian Zhang, Guiming Zhang, Jianhui Fu, Lichuan Zhou

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引用次数: 0

Abstract

This study investigates the quasi-static and dynamic compressive mechanical properties of polyamide-6 at different temperatures (25–85 ℃) and strain rates (2.6 × 10⁻⁴–3.2 × 10³ s⁻¹) by using a universal testing machine and a split Hopkinson pressure bar device. The variation of mechanical properties with temperature and strain rate is analyzed. The results show that the stress–strain response of polyamide-6 at different temperatures and strain rates includes viscoelastic deformation, yield behavior, and strain hardening behavior. Under some experimental conditions, polyamide-6 has constant stress flow states, which are related to temperature and strain rate. The mechanical properties of polyamide-6 are significantly affected by temperature and strain rate. The elastic modulus, yield strength, and energy absorption property increase with an increase of strain rate, but decrease with an increase of temperature. The formulas of yield strength and elastic modulus are given, and a modified constitutive model is given to describe the stress–strain response of polyamide-6. The predicted results of the model are in good agreement with the experimental data at different temperatures and strain rates.

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聚酰胺-6 在不同温度和应变率下的动态压缩行为和构成模型

本研究使用万能试验机和分体式霍普金森压力棒装置，研究了聚酰胺-6 在不同温度（25-85 ℃）和应变率（2.6 × 10-4-3.2 × 103 s-1）下的准静态和动态压缩机械性能。分析了机械性能随温度和应变率的变化。结果表明，聚酰胺-6 在不同温度和应变速率下的应力-应变响应包括粘弹性变形、屈服行为和应变硬化行为。在某些实验条件下，聚酰胺-6 具有恒定的应力流动状态，这与温度和应变速率有关。聚酰胺-6 的机械性能受温度和应变速率的影响很大。弹性模量、屈服强度和能量吸收性能随应变速率的增加而增加，但随温度的增加而降低。给出了屈服强度和弹性模量的计算公式，并给出了一个改进的构成模型来描述聚酰胺-6 的应力-应变响应。该模型的预测结果与不同温度和应变速率下的实验数据十分吻合。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Acta Mechanica 物理-力学

CiteScore

4.30

自引率

14.80%

发文量

292

审稿时长

6.9 months

期刊介绍： Since 1965, the international journal Acta Mechanica has been among the leading journals in the field of theoretical and applied mechanics. In addition to the classical fields such as elasticity, plasticity, vibrations, rigid body dynamics, hydrodynamics, and gasdynamics, it also gives special attention to recently developed areas such as non-Newtonian fluid dynamics, micro/nano mechanics, smart materials and structures, and issues at the interface of mechanics and materials. The journal further publishes papers in such related fields as rheology, thermodynamics, and electromagnetic interactions with fluids and solids. In addition, articles in applied mathematics dealing with significant mechanics problems are also welcome.