Evaluating the thermal-mechanical coupling effect on rubber aging: a combined experimental and modeling approach
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University of Akron / OhioLINK
2020
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=akron1586791964476118 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-akron15867919644761182021-08-03T07:14:18Z Evaluating the thermal-mechanical coupling effect on rubber aging: a combined experimental and modeling approach Guo, Xufeng Mechanical Engineering Materials Science Chemical Engineering rubber aging thermal-mechanical coupling effect cyclic stress oxygen diffusion kinetic-diffusion mode The study of thermal-mechanical coupled effect on rubber aging, especially under cyclic stress, is very limited in the literature, and the underlying mechanism for the coupled effect remains unclear. In this thesis, thermal-mechanical coupling effect on rubber aging is experimentally investigated, and a mechanism based on rate theory is proposed and formulated into kinetic-diffusion model to explain the experimental observation. Rubber aging at different temperatures without stress, with static stress, and with dynamic stress, is carried out in a customized test rig to reveal the unique thermal-mechanical coupling effect. Mechanical tensile tests and FT-IR tests are applied to measure mechanical property and microstructure changes, which are then used to characterize the degree of oxidation. The results show that dynamic stress can substantially accelerate aging process at different temperatures, implying the significance of the coupled effect. To elucidate the underlying mechanism, a kinetic-diffusion model based on chemical reaction and oxygen diffusion is developed to simulate the accelerated aging process. The coupled thermal-mechanical effect is formulated into the kinetic-diffusion model based on the hypothesis that dynamic stress decreases the activation energy of oxygen diffusion, leading to a faster oxygen diffusion channel. The good match between the experimental observation and the modeling result suggests that the decrease of activation energy of oxygen channel resulting from dynamic stress can well explain the observed coupled thermal-mechanical effect on rubber aging. This work delivers an integrated systematic platform to study thermal-mechanical effect on rubber aging with test rig design, mechanical and microstructure characterization, and kinetic-diffusion model development. 2020-07-01 English text University of Akron / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=akron1586791964476118 http://rave.ohiolink.edu/etdc/view?acc_num=akron1586791964476118 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
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NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Mechanical Engineering Materials Science Chemical Engineering rubber aging thermal-mechanical coupling effect cyclic stress oxygen diffusion kinetic-diffusion mode |
| spellingShingle |
Mechanical Engineering Materials Science Chemical Engineering rubber aging thermal-mechanical coupling effect cyclic stress oxygen diffusion kinetic-diffusion mode Guo, Xufeng Evaluating the thermal-mechanical coupling effect on rubber aging: a combined experimental and modeling approach |
| author |
Guo, Xufeng |
| author_facet |
Guo, Xufeng |
| author_sort |
Guo, Xufeng |
| title |
Evaluating the thermal-mechanical coupling effect on rubber aging: a combined experimental and modeling approach |
| title_short |
Evaluating the thermal-mechanical coupling effect on rubber aging: a combined experimental and modeling approach |
| title_full |
Evaluating the thermal-mechanical coupling effect on rubber aging: a combined experimental and modeling approach |
| title_fullStr |
Evaluating the thermal-mechanical coupling effect on rubber aging: a combined experimental and modeling approach |
| title_full_unstemmed |
Evaluating the thermal-mechanical coupling effect on rubber aging: a combined experimental and modeling approach |
| title_sort |
evaluating the thermal-mechanical coupling effect on rubber aging: a combined experimental and modeling approach |
| publisher |
University of Akron / OhioLINK |
| publishDate |
2020 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=akron1586791964476118 |
| work_keys_str_mv |
AT guoxufeng evaluatingthethermalmechanicalcouplingeffectonrubberagingacombinedexperimentalandmodelingapproach |
| _version_ |
1719456861046964224 |