On the influence of the material properties of the external ear on occlusion effect simulations
Keywords:Histology, 2-D model, 3D models, Anatomical images, Bony tissue, Cadaver heads, Fractional factorial designs, Material property, Numerical predictions, Occlusion effect, Poisson's ratio, Skin tissue, Young's Modulus
AbstractA two-level fractional factorial design was implemented to examine how the material properties of the external ear tissues influence numerical predictions of the occlusion effect (OE). A simplified 2D model was developed and successfully compared to an equivalent 3D model whose complex external ear geometry was reconstructed using 135 anatomical images of a female cadaver head. Outer circumferential boundaries of the skin and cartilage domains are fixed. Analysis of variance indicates significant single factor effects for skin, soft, and bony tissues. Skin, soft, and bony material properties are found to contribute significantly to simulated OEs. Mostly Poisson's ratio and Young's modulus of the skin tissue tend to exhibit effect estimates which are large enough to cause relevant variations in simulated OE data.
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