MAE 311 Lecture Notes - Lecture 6: Shear Stress, Stress (Mechanics), Body Force

• School: University at Buffalo
• Department: Mechanical & Aerospace Engr
• Course: MAE 311
• Professor: Phillip Cormie

Document Summary

Stress, strain and deflection: for a prismatic bar (uniform cross-section), Stress, = e and cross-sectional area, a = bh. Stress: force divided by area, i. e. the force applied to an area. The intensity of internal forces at a given point, for a specified coordinate system. Internal forces: forces that hold the body together. Surface forces forces applied to the surface of a body, it can be concentrated or distributed (uniform or varying) Body forces (typically we ignore these) forces associated with the mass of the body, typically expressed force per unit volume, e. g. gravity, magnetic etc. These forces must be in equilibrium, for the system to be in equilibrium, each individual part must be in equilibrium. 0a x xy xz df z da df x da df y da. Is the normal stress and "s are shear stresses. Normal stress: intensity of force that is parallel to the surface (at a given point)