Pressure induced by roll-down foam-earplugs on earcanal

Physical discomfort of earplug is a common complaint, so much it jeopardizes the health and safety workers, resulting in frequent noncompliance to proper wearing earplugs. A pressing need thus arises understand underlying mechanics for interaction earplugs with earcanal walls. An idealized cylindrical geometry first treated computational analytical modeling predict pressure induced by roll-down PVC foam In order representative values distribution, we estimated hyperelastic properties foam-based characterized their behavior using stent testing machine (J-CrimpTM machine) that mimics radial compression inside earcanals. Similarly, skin based on simplified model consisting single layer. As crosscheck those found calibrated models, validated them literature against set three experiments: (i) expansion holder, (ii) quasi-static uniaxial (iii) transverse compression. We finally used compute magnitude distribution an axisymmetric representation as well 3D realistic reconstructed from MRI images human subject.