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Characterization of nonlinear and time-dependent behavior of skin under compression.

Authors
Wu-JZ; Dong-RG; Smutz-WP
Source
Biomedical Engineering: Recent Developments, J. Vossoughi, Ed., Medical and Engineering Publishers, Inc. 2002 Sep :187-188
Link
NIOSHTIC No.
20022346
Abstract
The vibration energy dissipation in the hand and fingers, which has been associated with vibration- induced injuries, is directly related to the biomechanics of skin and subcutaneous tissues [1]. Therefore, biomechanical properties of skin and subcutaneous tissues are important for the understanding of the pathomechanics of work-related neural and vascular diseases. The soft tissues in fingers are mostly in compression under physiological loading conditions. However, the published mechanical properties of skin [e.g., 2-3] were obtained exclusively during tensile loading. The goal of the present study is to develop a methodology to characterize nonlinear and time-dependent behaviors of skin in compression. Pigskins were used in the present study. Three series of tests were performed: (a) stress relaxation, (b) slow confined compression (1 microm/s), and (c) slow and fast unconfined compressions (1 and 100 microm/s). The parameters in the cqnstitutive model were identified using the force relaxation, slow confined and unconfined compression tests (1 microm/s), while the fast unconfined compression test (100 microm/s) was used to validate the constitutive model. A nonlinear finite element model (FEM) was developed for the model parameter identification and model validation. Our results suggest "that the mechanical behaviors of skin tissues are highly nonlinear and time-dependent; and the deformation behaviors of these soft tissues can be satisfactorily described using the Ogden form.
Keywords
Skin-tests; Biomechanics; Cardiovascular-system-disorders; Vibration-disease; Circulatory-system; Nerve-damage; Neurovascular-disorders
Publication Date
20020901
Document Type
Book or book chapter; Conference/Symposia Proceedings
Editors
Vossoughi-J
Fiscal Year
2002
NTIS Accession No.
NTIS Price
ISBN No.
1930636016
NIOSH Division
HELD
Priority Area
Disease and Injury: Musculoskeletal Disorders of the Upper Extremities; Research Tools and Approaches: Control Technology and Personal Protective Equipment
Source Name
Biomedical Engineering: Recent Developments
State
WV
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