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Three-dimensional finite element simulations of the mechanical response of the fingertip to static and dynamic compressions.

Authors
Wu-JZ; Welcome-DE; Dong-RG
Source
Comp Methods Biomech Biomed Eng 2006 Feb; 9(1):55-63
NIOSHTIC No.
20030631
Abstract
The analysis of the mechanics of the contact interactions of fingers/handle and the stress/strain distributions in the soft tissues in the fingertip is essential to optimize design of tools to reduce many occupation-related hand disorders. In the present study, a three-dimensional (3D) finite element (FE) model for the fingertip is proposed to simulate the nonlinear a.J1d time-dependent responses of a fingertip to static and dynamic loadings. The proposed FE model incorporates the essential anatomical structures of a finger: skin layers (outer and inner skins), subcutaneous tissue, bone and nail. The soft tissues (inner skin and subcutaneous tissue) are considered to be nonlinearly viscoelastic, while the hard tissues (outer skin, bone and nail) are considered to be linearly elastic. The proposed model has been used to simulate two loading scenarios: (a) the contact interactions between the fingertip and a flat surface and (b) the indentation of the fingerpad via a sharp wedge. For case (a), the predicted force/displacement relationships and time-dependent force responses are compared with the published experimental data; for case (b), the skin surface deflection profiles were predicted and compared with the published experimental observations. Furthermore, for both cases, the time-dependent stress/strain distributions within the tissues of the fingertip were calculated. The good agreement between the model predictions and the experimental observations indicates that the present model is capable of predicting realistic time-dependent force/displacement responses and stress/strain distributions in the soft tissues for dynamic loading conditions.
Keywords
Simulation-methods; Hand-injuries; Hand-protection; Models; Skin; Biomechanics; Biomechanical-modeling; Biomechanical-engineering; Ergonomics
CODEN
CMBEFS
Publication Date
20060201
Document Type
Journal Article
Email Address
jwu@cdc.gov
Fiscal Year
2006
NTIS Accession No.
NTIS Price
Issue of Publication
1
ISSN
1025-5842
NIOSH Division
HELD
Priority Area
Disease and Injury: Musculoskeletal Disorders of the Upper Extremities
Source Name
Computer Methods in Biomechanics and Biomedical Engineering
State
WV
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