Alan D. Freed Clifford H. Spicer Chair in Engineering Appointed to SVSU in 2007 Ph.D. University of Wisconsin, Madison M.S. University of Wisconsin, Madison B.S. University of Wisconsin, Madison
CONFERENCE PRESENTATIONS Freed, A.D. (2011, May). A stroll down Oberon Lane. Paper presented at Oberon Day, Eidgenössische Technische Hochschule (ETH) Zürich, Switzerland. Freed, A.D. (2011, August). Hypo-elastic model for lung parenchyma. Paper presented at The 2nd International Conference on Material Modeling, Paris, France.
ARTICLES Freed, A.D., & Einstein, D.R. (2011). Viscoelastic model for lung parenchyma for multi-scale modeling of respiratory system. Phase I: Hypo-elastic model for CFD implementation. Pacific Northwest National Laboratory, Richland, WA, PNNL-20340 An isotropic constitutive model for the parenchyma of lung has been derived from the theory of hypo-elasticity. The intent is to use it to represent the mechanical response of this soft tissue in sophisticated, computational, fluid-dynamic models of the lung. This demands that the continuum model be accurate, yet simple and efficient. An objective algorithm for its numeric integration is provided. The response of the model is determined for several boundary-value problems whose experiments are used for material characterization. The effective elastic, bulk, and shear moduli, and Poisson‘s ratio, as tangent functions, are also derived. The model is characterized against published experimental data for lung. A bridge between this continuum model and a dodecahedral model of alveolar geometry is investigated, with preliminary findings being reported.
Research Bulletin 2011
191