用实验表征绝热温升研究玻璃质聚碳酸酯在慢扭转下的热力学

IF 2 3区 工程技术 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
S. Wu, W. Li, L. Zhuo, J. Zhu, G. Xie, W. Zhang, P. Singhatanadgid, D. Zhang
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引用次数: 0

摘要

非晶聚合物在工程应用中得到了广泛的应用,其本构模型需要使用同步应力-应变和塑性耗散等表征数据进行验证。进行慢应变速率实验是方便的,但测量绝热温升仍然是一个挑战,因为热传递的估计仍然缺乏准确性。目的建立一种适合于同时测量聚碳酸酯在慢扭转(< 1 s−1)下应力应变和绝热温度的方法。方法采用数字图像相关、红外热像仪和扭扭机传感器同步测量热响应和力学响应。相关绝热温度可通过简单对流模型规定等效换热来计算,其系数由机械加载后的温降测量值通过参数拟合确定。由于该阶段传热的主要形式是对流,因此为了得到精确的热量计算,利用温度下降的前期建立了理想的对流系数。最后,采用具有泰勒-昆尼系数的塑性功热转换模型对表征结果进行了验证。结果表明:在-0.51 ~ 0.43范围内进行3 / 4次反循环剪切应变,可使绝热温度升高约45℃;该数值与Taylor-Quinney系数计算的47℃左右的理论值吻合较好。结论基于热传递条件下绝热温升的精确估算,建立了玻璃聚碳酸酯在慢扭转条件下热力学研究的实验方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Thermodynamic Investigation of Glassy Polycarbonate Under Slow Torsion by Experimentally Characterizing Adiabatic Temperature Rise

Background

Amorphous polymers are widely employed in engineering applications where their constitutive models need to be verified using characterization data such as synchronous stress–strain and plastic dissipation. It is convenient to conduct slow strain rate experiments, but measuring the adiabatic temperature rise remains challenging because the estimation of the heat transfer still has a lack of accuracy.

Objective

A suitable method was developed for simultaneously measuring stress–strain and adiabatic temperature for polycarbonate subjected to slow torsion (< 1 s−1).

Methods

The thermal and mechanical responses were measured through synchronizing the digital image correlation, IR thermography and the sensors of torsion machine. The related adiabatic temperature can be calculated by prescribing the equivalent heat transfer using a simple convection model, whose coefficient was determined using a parametric fitting based on the measurement of temperature drop after the mechanical loading. To obtain the precise heat calculation, an ideal convection coefficient was established by using the earlier stage of the temperature drop because the primary form of heat transmission at this stage was convection. At last, a plastic work-to-heat conversion model with a Taylor-Quinney coefficient was used to validate the characterized results.

Results

It shows that three and a quarter cycles of reversed cyclic shear strains from -0.51 to 0.43 will result in an increase in the adiabatic temperature of roughly 45˚C. This value agrees well with the theoretical value of about 47 ˚C calculated using the Taylor-Quinney coefficient.

Conclusions

An experimental method for glassy polycarbonate’s thermodynamic investigation under slow torsion is established based on the accurate estimation of adiabatic temperature rise in the presence of heat transfer.

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来源期刊
Experimental Mechanics
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.
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