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An Experimental Study of the Rate Dependencies of a Nonwoven Paper Substrate in Tension using Constitutive Relations
Burchnall, Mark

2012, MS, University of Cincinnati, Engineering and Applied Science: Mechanical Engineering.
Paper is an everyday product used for various reasons by the consumer. This study focuses on a low basis weight nonwoven paper substrate used as toilet paper. Paper manufacturers are always trying to increase line speed to push out more paper at the same cost and the manufacturing process this research focuses on is the embossing process. This study will focus on determining the rate dependent in-plane constitutive relations that define the mechanical behavior of the paper substrate in tension. Once the constitutive models are created they can be imported into a finite-element software package and used to study changes made to the embossing process. Experimental tests were run in order to isolate specific properties of the material. Uniaxial tension tests were run at 0.1 1/s, 4.5 1/s and 45 1/s total engineering strain rates in order to determine the rate dependent effects on the material. Stress relaxation tests were run at varying moisture contents and temperatures with the idea of determining the viscoelastic model and how moisture and temperature affect the material. Viscoelastic and viscoplastic behavior models were developed to characterize the rate dependencies in the elastic and plastic regions of the material. A generalized Maxwell model is used to model the viscoelastic region and a modified form of G’sell’s flow stress law was used in conjunction with the viscous based overstress theory (VBO) to define the viscoplastic region. The research done on this paper substrate details a method to define the rate dependent constitutive properties of any fiber network material through an experimental study.
Yijun Liu, PhD (Committee Chair)
Richard W. Hamm, MS (Committee Member)
Kumar Vemaganti, PhD (Committee Member)
104 p.

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Burchnall, M. (2012). An Experimental Study of the Rate Dependencies of a Nonwoven Paper Substrate in Tension using Constitutive Relations. (Electronic Thesis or Dissertation). Retrieved from https://etd.ohiolink.edu/

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Burchnall, Mark. "An Experimental Study of the Rate Dependencies of a Nonwoven Paper Substrate in Tension using Constitutive Relations." Electronic Thesis or Dissertation. University of Cincinnati, 2012. OhioLINK Electronic Theses and Dissertations Center. 16 Dec 2017.

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Burchnall, Mark "An Experimental Study of the Rate Dependencies of a Nonwoven Paper Substrate in Tension using Constitutive Relations." Electronic Thesis or Dissertation. University of Cincinnati, 2012. https://etd.ohiolink.edu/

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