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The application of modified linear elastic fracture mechanics (LEFM) and its implication for tear strength development of fibrous materials

Zhang, Ziyang
http://orcid.org/0000-0003-1860-2248
http://rave.ohiolink.edu/etdc/view?acc_num=miami1604416361486942

Abstract Details

2020, Master of Science, Miami University, Chemical, Paper and Biomedical Engineering.
Linear Elastic Fracture Mechanics (LEFM) has been modified to account for the role of inherent fracture processing zone in failure of fibrous materials. The presented study further validates the theory using both prepared handsheets with different pressing conditions and literature reported handsheet tensile strength data under different notch size. The analysis shows that modified LEFM can capture the trend of tensile strength as functions of notch size. To further expand the application of the model, we used a simple shifting manipulation coupled with a fitting procedure to indirectly determine characteristic fracture processing zone length. After the treatment, all the tensile strength data were fitted into a unified fracture model. The results show that increasing porosity or decreasing density leads to increase of fracture processing zone length. Lastly, we evaluated the role of tensile strength in affecting the tear strength. We found that tear strength reaches a maximum value as tensile strength increases but drops dramatically once tensile strength or breaking length reaches a critical value for softwood based handsheets. The implication of this results suggests that one should consider the nature of the fibers when preparing high tensile strength and tear strength fibrous materials.
Douglas Coffin (Advisor)
Jessica Sparks (Committee Member)
Shashi Lalvani (Committee Member)
35 p.
Chemical Engineering; Mechanical Engineering; Mechanics
Linear elastic fracture mechanics; tensile strength; tear strength; cellulose; fibrous materials

Recommended Citations

Citations

  • Zhang, Z. (2020). The application of modified linear elastic fracture mechanics (LEFM) and its implication for tear strength development of fibrous materials [Master's thesis, Miami University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=miami1604416361486942

    APA Style (7th edition)

  • Zhang, Ziyang. The application of modified linear elastic fracture mechanics (LEFM) and its implication for tear strength development of fibrous materials. 2020. Miami University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=miami1604416361486942.

    MLA Style (8th edition)

  • Zhang, Ziyang. "The application of modified linear elastic fracture mechanics (LEFM) and its implication for tear strength development of fibrous materials." Master's thesis, Miami University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=miami1604416361486942

    Chicago Manual of Style (17th edition)

miami1604416361486942
272
© 2020, some rights reserved.Creative Commons License The application of modified linear elastic fracture mechanics (LEFM) and its implication for tear strength development of fibrous materials by Ziyang Zhang is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by Miami University and OhioLINK.