Biomechanics_course_gw_12-13 constitutive

Biomechanics_course_gw_12-13 constitutive - Constitutive...

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Unformatted text preview: Constitutive behavior Material mechanical properties: stiffness, hardness, tough, ductile and brittle Constitutive relation or diagram between stress and strain Linear/nonlinear Elastic/inelasticity Homogeneous/heterogeneity Isotropy/anisotropy Constitutive behavior Linear/nonlinear Proportionality limit: for small strain Material: metals, bone Nonlinearity becomes dominated at relatively high strain, Material: elastomers, soft tissues (but without permanent change in structure) Elastic/inelasticity Elasticity Resume its original (stress-free) size and shape upon removal of the load Stress and strain relation recovers completely to the path of loading phase after loading is removed No energy dissipation due the deformation Responds instantaneously to an applied load Material: metal at small strain Nearly elastic (pseudoelastic): Not pure elastic, having a hysteresis between loading and unloading curve Material: soft tissues, rubber Plasticity Permanent deformation after the removal of the load Constitutive behavior Homogeneous/heterogeneity Homogeneous Behavior is independent space position of the body Material: Many metals, rubberlike materials Skin, lung parenchyma, myocardium, brain tissue, bone Heterogeneous Due to layering Behavior is dependent on space position of the body Materials: fiber reinforced composite, steel reinforced concrete Isotropy/anisotropy Isotropy Independent of its orientation within the body Anisotropy Dependent of its orientation within the body Stress-strain diagram Proportionality limit...
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Biomechanics_course_gw_12-13 constitutive - Constitutive...

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