title: Transient study of couple stress effects in compact bone: torsion.
abstract: Couple stress theory, which admits an internal moment per unit area as well as the usual force per unit area, is a generalization of classical elasticity. Experimentally we have demonstrated the existence of couple stress by measuring the effect of size on apparent stiffness of compact bone in quasi-static torsion. From these measurements, we obtain the characteristic length for bone in couple stress theory.
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D001842:Bone and Bones / Q000502:physiology*; D004548:Elasticity; D005269:Femur / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D008962:Models, Theoretical; D010827:Physiology / Q000295:instrumentation; D013314:Stress, Mechanical