title: FEM simulation of single beard hair cutting with foil-blade-shaving system.
abstract: The performance of dry-shavers depends on the interaction of the shaving components, hair and skin. Finite element models on the ABAQUS/Explicit platform are established to simulate the process of beard hair cutting. The skin is modelled as three-layer structure with a single cylindrical hair inserted into the skin. The material properties of skin are considered as Neo-Hookean hyper-elastic (epidermis) and Prony visco-elastic (dermis and hypodermis) with finite deformations. The hair is modelled as elastic-plastic material with shear damage. The cutting system is composed of a blade and a foil of shaver. The simulation results of cutting processes are analyzed, including the skin compression, hair bending, hair cutting and hair severance. Calculations of cutting loads, skin stress, and hair damage show the impact of clearance, skin bulge height, blade dimension and shape on cutting results. The details show the build-up of finite element models for hair cutting, and highlight the challenges arising during model construction and numerical simulation.
authors.affiliation: Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China; State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China. Electronic address: fangg@tsinghua.edu.cn.
authors.forename: Gang
authors.initials: G
authors.lastname: Fang
authors.affiliation: Braun GmbH, Frankfurter Str. 145, D-61476 Kronberg im Taunus, Germany.
authors.forename: Alois
authors.initials: A
authors.lastname: Köppl
mesh_terms: D001696:Biomechanical Phenomena; D020342:Finite Element Analysis; D006197:Hair; D006801:Humans; D055595:Mechanical Phenomena; D012867:Skin; D013314:Stress, Mechanical
keywords: Beard hair; Cutting; Finite element method; Skin