Kinesiology 2241A/B Lecture Notes - Lecture 26: Ultimate Tensile Strength, Modulus Guitars, Unit Load
7 Oct 2016
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The internal force per unit area which results by applying an external load or force. Units: pascal = n: resistance to deformation. Types of stress: tension, compression (best at, bending, shear (worst at, torsion. Carbon fiber (used for hockey sticks) very flexible, but stiff in one direction. Longitudinal strain: change in dimensions of the material divided by its original size, tension & compression. Transverse strain: angular deformation, pushing on one side of an object. Relationship: strain (x) and stress (y) shows linear relationship, slope = young"s modules (indicated stiffness and resistance to deformation) Ex: bones, muscles, ligaments, tendons absorb forces (good at deformation) Hooke"s law: deformation increases proportionally to the applied load, or strain increases proportionally to the stress resisting the applied load. For every unit load placed on object equal amount of deformation. Plasticity: change in size and shape are retained after load is removed / after deformation.
