MAAE 2202 Lecture 2: Solids (I) Notes - Chapter 2

• School: Carleton University
• Department: Mechanical and Aerospace Engineering
• Course: MAAE 2202
• Professor: Xin Wang

Document Summary

Analysis of stress and strain is to understand how a body supports applied loads and the associated changes in geometry (deformation). Stress (normal stress , or shear stress ) is a measure of the intensity of force over an area, that is, force per unit area. A stress that acts perpendicular to a plane is defined as normal stress, and a stress that acts parallel to a plane is defined as shear stress. Consider normal stress at the cross-section c-c of a bar subjected to uniaxial loading as shown below. Pi is the internal reacting force acting on the a area, so pi = . The internal force per unit area is pi. The normal stress at a point is then expressed as pi lim. Units of stress: n/mm2 (mpa), n/m2 (pa), lb/in2 (psi), lb/ft2. 1 mpa = 1 n/mm2 = 1 mn/m2. 1 gpa = 1 gn/m2 = 103 mpa.