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Validation and Modeling of a Subject-Driven Device for In Vivo Finger Indentation Using a Finger Mimic

Engel, Andrew
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1491557931643749

Abstract Details

2017, MS, University of Cincinnati, Engineering and Applied Science: Mechanical Engineering.
Researchers have long studied the mechanical response of skin and underlying tissue. In particular, understanding the mechanical response of finger pads has been an area of interest due to the number and variety of interactions finger pads undergo every day. However, modern testing systems are expensive, non-portable, and pose a safety risk to the test subject when performing in vivo tests since they are machine-driven. This research explores a portable, subject-driven push-button fixture as a means of measuring the mechanical response of in vivo finger pad tissue. Simulation techniques will be utilized to determine if such a device is viable and what the requirements of this device are in order to attain data accurate enough to determine material parameters. This research has three major stages. In the first stage, a urethane material that mimics human finger pad tissue hardness is chosen as a surrogate to human tissue (hereinafter referred to as mimic material). Durometer testing is performed on male and female subjects with a wide age range in order to determine the target hardness of the urethane mimic material. Preliminary simulations are made on a simplified finger geometry and compared to the theoretical solution in order to determine the optimal general boundary conditions. In the second stage, the mimic material undergoes traditional material testing to determine a nonlinear constitutive material model. Circular compression samples are then tested using the proprietary push-button fixture to determine output force and displacement. A finite element (FE) model of the fixture that utilizes the determined material model is then used to establish the specific boundary conditions of the fixture, first in an axisymmetric configuration followed by a full 3D model. In the third stage, a mold of a female index finger is taken and used to cast a mimic material finger. The finger is scanned and its geometry is used in the 3D fixture FE model. Compression testing using the mimic material finger is performed and the results are compared to the simulation. The simulation techniques validate that the push-button fixture is capable of determining the material parameters needed to replicate the response of the finger pad tissue mimic material.
Kumar Vemaganti, Ph.D. (Committee Chair)
Gary Gross, M.S (Committee Member)
Yijun Liu, Ph.D. (Committee Member)
Ala Tabiei, Ph.D. (Committee Member)
85 p.
Mechanical Engineering
material modeling; finite element modeling; finger tissue; subject-driven

Recommended Citations

Citations

  • Engel, A. (2017). Validation and Modeling of a Subject-Driven Device for In Vivo Finger Indentation Using a Finger Mimic [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1491557931643749

    APA Style (7th edition)

  • Engel, Andrew. Validation and Modeling of a Subject-Driven Device for In Vivo Finger Indentation Using a Finger Mimic. 2017. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1491557931643749.

    MLA Style (8th edition)

  • Engel, Andrew. "Validation and Modeling of a Subject-Driven Device for In Vivo Finger Indentation Using a Finger Mimic." Master's thesis, University of Cincinnati, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1491557931643749

    Chicago Manual of Style (17th edition)

ucin1491557931643749
172
© 2017, some rights reserved.Creative Commons License Validation and Modeling of a Subject-Driven Device for In Vivo Finger Indentation Using a Finger Mimic by Andrew Engel 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 University of Cincinnati and OhioLINK.