PHYS 1003 Lecture Notes - Lecture 16: Cylinder Stress, Shear Stress, Kinematics
14 Nov 2016
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Document Summary
Stress is the external force per unit area applied to the solid object. With this definition, we use the magnitude of the force perpendicular to the area a to define this stress. The strain is the response to stress. It is the fractional change in length with the same axis for that of stress. Positive if stress is stretching (tensile force) Negative if stress is compressing (compressive force) ** tensile and compressive force is important vocab, used often in questions. Rod will get longer in direction of forces, but will get thinner at the sides (volume conserved) Rod will get shorter in direction of forces, but will bulge out at the sides (volume conserved) Poisson"s ratio defines the response in both directions to an axial stress. Note: axial stress means a stress that tends to change the length of a body (so compressive or tensile stresses) It elongates in the axial direction while contracting in the transverse direction. (perpendicular)
