title: Characterization of the nonlinear elastic behavior of chinchilla tympanic membrane using micro-fringe projection.
abstract: The mechanical properties of an intact, full tympanic membrane (TM) inside the bulla of a fresh chinchilla were measured under quasi-static pressure from -1.0 kPa to 1.0 kPa applied on the TM lateral side. Images of the fringes projected onto the TM were acquired by a digital camera connected to a surgical microscope and analyzed using a phase-shift method to reconstruct the surface topography. The relationship between the applied pressure and the resulting volume displacement was determined and analyzed using a finite element model implementing a hyperelastic 2(nd)-order Ogden model. Through an inverse method, the best-fit model parameters for the TM were determined to allow the simulation results to agree with the experimental data. The nonlinear stress-strain relationship for the TM of a chinchilla was determined up to an equibiaxial tensile strain of 31% experienced by the TM in the experiments. The average Young's modulus of the chinchilla TM from ten bullas was determined as approximately 19 MPa.
authors.affiliation: Department of Mechanical Engineering, The University of Texas at Dallas, Richardson, TX 75080, USA.
authors.forename: Junfeng
authors.initials: J
authors.lastname: Liang
authors.affiliation: Department of Mechanical Engineering, The University of Texas at Dallas, Richardson, TX 75080, USA.
authors.forename: Huiyang
authors.initials: H
authors.lastname: Luo
authors.affiliation: School of Aerospace and Mechanical Engineering, The University of Oklahoma, Norman, OK 73019, USA.
authors.forename: Zachary
authors.initials: Z
authors.lastname: Yokell
authors.affiliation: School of Aerospace and Mechanical Engineering, The University of Oklahoma, Norman, OK 73019, USA.
authors.forename: Don U
authors.initials: DU
authors.lastname: Nakmali
authors.affiliation: School of Aerospace and Mechanical Engineering, The University of Oklahoma, Norman, OK 73019, USA.
authors.forename: Rong Zhu
authors.initials: RZ
authors.lastname: Gan
authors.affiliation: Department of Mechanical Engineering, The University of Texas at Dallas, Richardson, TX 75080, USA. Electronic address: hongbing.lu@utdallas.edu.
authors.forename: Hongbing
authors.initials: H
authors.lastname: Lu
mesh_terms: D000465:Algorithms; D000818:Animals; D001696:Biomechanical Phenomena; D002682:Chinchilla / Q000502:physiology*; D003198:Computer Simulation; D055119:Elastic Modulus; D020342:Finite Element Analysis; D038781:Otoscopy; D011312:Pressure; D013314:Stress, Mechanical; D014432:Tympanic Membrane / Q000502:physiology*; D014783:Viscosity
keywords: Chinchilla; Hyperelastic model; Micro-fringe projection; Static pressure; Tympanic membrane