BIOL 205 Lecture Notes - Lecture 19: Compressive Stress, Neutral Axis, Main Stem
Document Summary
Body structural support: biomechanics, mechanical laws related to structure and movement of living organisms, structural support exist at cell level and whole organism level. E. g. single cell organism has microskeleton for locomotion: maintain shape while allowing movement, a system of inter connected elements. Stress: external force acting on the body compression tension opposite forces pulling away. Shear forces that try to slide one part of the object against other parts; at molecular level, causes the distance between molecules to increase: strain the result of the stress, and the magnitude is proportional to stress (hooke"s. Law: elastic strain the work done is stored as energy in deformation, will recover after removing the stress. E. g. bones under tensile/compressive load (before yield point) As the forces increase beyond yield point, it changes to plastic strain the elastic strain in tendons is not strictly proportional to the forces; there is energy lost during deformation and recovery: plastic strain.
