通过热力学熵生成评估聚酰胺 6 的体积应变

IF 2 3区工程技术 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Experimental Mechanics Pub Date : 2023-11-08 DOI:10.1007/s11340-023-01009-x

T. Sakai, Y. Oya, J. Koyanagi

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引用次数: 0

摘要

背景聚合物等韧性材料在变形过程中会释放能量。耗散的能量可以用熵的产生来评估。本研究使用差示扫描量热法（DSC）获得了受任意应变影响的聚酰胺 6（PA6）的热力学熵。方法使用 DSC 测量拉伸试验开始和每个应变状态下的热力学熵，并使用数字图像相关法测量体积应变。结果在出现颈缩行为前的 25% 应变时，PA6 的体积应变为 ~4.8%，熵为 ~56 kJ/K∙m3。此外，还评估了碳纤维增强塑料 PA6 在拉伸条件下产生的热力学熵。结果表明，在横向开裂（与基体树脂中的颈缩相同）之前产生的热力学熵为 ~69 kJ/K∙m3，复合材料中 PA6 的体积应变为 ~3.56 %。结果表明，纯 PA6 和复合 PA6 的熵产生量和体积应变值几乎相同。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Evaluation of Volumetric Strain on Polyamide 6 by Thermodynamic Entropy Generation

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Evaluation of Volumetric Strain on Polyamide 6 by Thermodynamic Entropy Generation

Background

A ductile material, such as a polymeric material, releases energy during deformation. The dissipated energy can be evaluated as entropy generation. If the thermodynamic entropy generation can be measured, the stress state can be evaluated by the thermodynamic entropy generation.

Objective

In this study, the thermodynamic entropy generation of Polyamide 6 (PA6) was obtained using differential scanning calorimetry (DSC) for a material subjected to arbitrary strain.

Methods

Thermodynamic entropies were measured at the beginning and at each strain state of tensile tests by using DSC, and the volumetric strain was measured with Digital Image Correlation Method.

Results

At the 25% strain just before the necking behavior, the volumetric strain of PA6 was ~4.8%, and the entropy was ~56 kJ/K∙m³. Furthermore, the thermodynamic entropy generation of PA6 in carbon fiber reinforced plastics was evaluated under tensile conditions. The results showed that the thermodynamic entropy generation just before the transverse cracking (as same as necking in matrix resin) was ~69 kJ/K∙m³ and the volumetric strain of PA6 in composite was ~ 3.56 %. As the results, the entropy generation and volumetric strain of PA6 showed almost same values in pure PA6 and PA6 in composite.

Conclusions

Consequently, thermodynamic entropy generation can be measured the volumetric strain of matrix resin.

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来源期刊

Experimental Mechanics 物理-材料科学：表征与测试

CiteScore

4.40

自引率

16.70%

发文量

111

审稿时长

3 months

期刊介绍： Experimental Mechanics is the official journal of the Society for Experimental Mechanics that publishes papers in all areas of experimentation including its theoretical and computational analysis. The journal covers research in design and implementation of novel or improved experiments to characterize materials, structures and systems. Articles extending the frontiers of experimental mechanics at large and small scales are particularly welcome. Coverage extends from research in solid and fluids mechanics to fields at the intersection of disciplines including physics, chemistry and biology. Development of new devices and technologies for metrology applications in a wide range of industrial sectors (e.g., manufacturing, high-performance materials, aerospace, information technology, medicine, energy and environmental technologies) is also covered.