ENGR 1166 Lecture Notes - Stress Concentration, Shear Stress
Chapter 13
Mechanics: Strength of
Materials
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Chapter Objectives
Define stress, yield strength, modulus of elasticity,
design stress, and safety factor
Describe a stress-strain diagram
Compute the required size of a structural member given
the limiting stress and/or limiting deformation
Describe the interrelationship of statics and strength of
materials in the design of structures and mechanisms
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Definition: Strength of Materials
The branch of mechanics dealing with the deformation
of a body due to the internal distribution of a system of
external forces applied to the body.
Roland D. Jenison�
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Document Summary
Define stress, yield strength, modulus of elasticity, design stress, and safety factor. Compute the required size of a structural member given the limiting stress and/or limiting deformation. Describe the interrelationship of statics and strength of materials in the design of structures and mechanisms. The branch of mechanics dealing with the deformation of a body due to the internal distribution of a system of external forces applied to the body. Define stress as force per unit area (s) s=f/a. Load is trying to shear the pin in two places. Two cross-sections of the pin resist the force. Stresses tend to concentrate at the edges of objects. Engineers apply a factor of safety to account for the stress concentration. As a tensile force is applied, the change in length (elongation = . l) is carefully measured. Strain, e,is a dimensionless ratio of the elongation, Stress-strain diagram is linear up to proportional limit.
