IV - On Pseudo-elasticity of Living Tissues
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Publisher SummaryThis chapter discusses the pseudo-elasticity of living tissues; soft tissues, such as arteries, muscles, skin, lung, and ureter have been considered. The mechanical properties of these tissues are qualitatively similar. It focuses on arteries. As a material, arteries are inelastic. They do not meet the definition of an elastic body, which requires that there should be a single-valued relationship between stress and strain. Arteries show hysteresis when they are subjected to cyclic loading and unloading. When held at a constant strain, they show stress relaxation. When held at a constant stress, they show creep. They are anisotropic. Their stress-strain-history relationships are non-linear. Their properties vary with the sites along the arterial tree, ageing, short- or long-term effects of drugs, hypertension, and inervation or denervation. An approach to non-linear elasticity uses the incremental law: a linearized relationship between the incremental stresses and strains obtained by subjecting a material to a small perturbation about a condition of equilibrium.

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