S. Wu, W. Li, L. Zhuo, J. Zhu, G. Xie, W. Zhang, P. Singhatanadgid, D. Zhang
{"title":"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","authors":"S. Wu, W. Li, L. Zhuo, J. Zhu, G. Xie, W. Zhang, P. Singhatanadgid, D. Zhang","doi":"10.1007/s11340-025-01156-3","DOIUrl":null,"url":null,"abstract":"<div><h3>Background</h3><p>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.</p><h3>Objective</h3><p>A suitable method was developed for simultaneously measuring stress–strain and adiabatic temperature for polycarbonate subjected to slow torsion (< 1 s<sup>−1</sup>).</p><h3>Methods</h3><p>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.</p><h3>Results</h3><p>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.</p><h3>Conclusions</h3><p>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.</p></div>","PeriodicalId":552,"journal":{"name":"Experimental Mechanics","volume":"65 5","pages":"717 - 728"},"PeriodicalIF":2.0000,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Thermodynamic Investigation of Glassy Polycarbonate Under Slow Torsion by Experimentally Characterizing Adiabatic Temperature Rise\",\"authors\":\"S. Wu, W. Li, L. Zhuo, J. Zhu, G. Xie, W. Zhang, P. Singhatanadgid, D. Zhang\",\"doi\":\"10.1007/s11340-025-01156-3\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><h3>Background</h3><p>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.</p><h3>Objective</h3><p>A suitable method was developed for simultaneously measuring stress–strain and adiabatic temperature for polycarbonate subjected to slow torsion (< 1 s<sup>−1</sup>).</p><h3>Methods</h3><p>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.</p><h3>Results</h3><p>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.</p><h3>Conclusions</h3><p>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.</p></div>\",\"PeriodicalId\":552,\"journal\":{\"name\":\"Experimental Mechanics\",\"volume\":\"65 5\",\"pages\":\"717 - 728\"},\"PeriodicalIF\":2.0000,\"publicationDate\":\"2025-02-28\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Experimental Mechanics\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s11340-025-01156-3\",\"RegionNum\":3,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"MATERIALS SCIENCE, CHARACTERIZATION & TESTING\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Experimental Mechanics","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s11340-025-01156-3","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, CHARACTERIZATION & TESTING","Score":null,"Total":0}
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.
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.