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Dissertation - Xiaoxiao Li .pdf (3.27 MB)

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Exploring and Understanding the Mechanical Responses of Polymeric Glasses Using Experiment and Simulation

Li, Xiaoxiao
http://rave.ohiolink.edu/etdc/view?acc_num=akron1521024609745403

Abstract Details

2018, Doctor of Philosophy, University of Akron, Polymer Science.
Polymeric glasses are important engineering materials in industry application and they are also of great academic interest. Unlike non-polymeric glasses rarely yielding during the external deformation, polymeric glasses with high molecular weight can undergo various mechanical response, such as shear yielding, necking, crazing, strain hardening, and brittle failure. Although enormous efforts, dating back to 70 years ago, have been made to understand the physics behind, the nature of the various mechanical response is still unclear and under debate. In this dissertation, we combine mechanical tests with computer simulation to investigate the mechanical response of polymeric glasses. With the help of our recently proposed hybrid structure model, we are able to understand the brittle-ductile transition, origin of stress, relaxation and elastic yielding. It is found that chain network is essential for polymeric glass system to avoid brittle failure. However, the failure of specimen with high molecular weight can also be achieved by dynamically chain pull-out through crazing. In the case that failure is avoided and large deformation is achieved, chain network is essential for building high level of stress, no matter in tensile or compression mode. When specimen relaxes after large deformation, relaxation of chain network is independent of alpha process, therefore is able to hold stress at temperature near Tg. Otherwise, if the specimen is released after large deformation, it is found that the imbedded stress coming from strained chain network, which is able to show up after increasing temperature.
Shi-Qing Wang (Advisor)
Mesfin Tsige (Advisor)
Toshikazu Miyoshi (Committee Chair)
Hunter King (Committee Member)
Jie Zheng (Committee Member)
Polymers

Recommended Citations

Citations

  • Li, X. (2018). Exploring and Understanding the Mechanical Responses of Polymeric Glasses Using Experiment and Simulation [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1521024609745403

    APA Style (7th edition)

  • Li, Xiaoxiao. Exploring and Understanding the Mechanical Responses of Polymeric Glasses Using Experiment and Simulation. 2018. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1521024609745403.

    MLA Style (8th edition)

  • Li, Xiaoxiao. "Exploring and Understanding the Mechanical Responses of Polymeric Glasses Using Experiment and Simulation." Doctoral dissertation, University of Akron, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1521024609745403

    Chicago Manual of Style (17th edition)

akron1521024609745403
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© 2018, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.