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Thesis Xufeng Guo.pdf (2.46 MB)

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Evaluating the thermal-mechanical coupling effect on rubber aging: a combined experimental and modeling approach

Guo, Xufeng
http://orcid.org/0000-0001-7677-8474
http://rave.ohiolink.edu/etdc/view?acc_num=akron1586791964476118

Abstract Details

2020, Master of Science in Engineering, University of Akron, Mechanical Engineering.
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.
Dong Yalin (Advisor)
Guoxiang Wang (Committee Member)
82 p.
Chemical Engineering; Materials Science; Mechanical Engineering
rubber aging; thermal-mechanical coupling effect; cyclic stress; oxygen diffusion; kinetic-diffusion mode

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Citations

  • Guo, X. (2020). Evaluating the thermal-mechanical coupling effect on rubber aging: a combined experimental and modeling approach [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1586791964476118

    APA Style (7th edition)

  • Guo, Xufeng. Evaluating the thermal-mechanical coupling effect on rubber aging: a combined experimental and modeling approach. 2020. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1586791964476118.

    MLA Style (8th edition)

  • Guo, Xufeng. "Evaluating the thermal-mechanical coupling effect on rubber aging: a combined experimental and modeling approach." Master's thesis, University of Akron, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1586791964476118

    Chicago Manual of Style (17th edition)

akron1586791964476118
221
© 2020, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.