Characterization of nonlinear and time-dependent behavior of skin under compression.
Wu-JZ; Dong-RG; Smutz-WP
Biomedical engineering recent developments: proceedings of the Twenty First Southern Biomedical Engineering Conference, September 28 - 29, 2002, Bethesda, Maryland. Vossoughi J, ed. Washington, DC: Medical and Engineering Publishers, Inc., 2002 Sep; :187-188
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 . 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.
Skin-tests; Biomechanics; Cardiovascular-system-disorders; Vibration-disease; Circulatory-system; Nerve-damage; Neurovascular-disorders
Disease and Injury: Musculoskeletal Disorders of the Upper Extremities; Research Tools and Approaches: Control Technology and Personal Protective Equipment
Biomedical engineering recent developments: proceedings of the Twenty First Southern Biomedical Engineering Conference, September 28 - 29, 2002, Bethesda, Maryland