Stress (Mechanics)
- id: 1757604305
- Date: Oct. 31, 2025, 11:13 a.m.
- Author: Donald F. Elger
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Stress is the force per unit area on or within a material that arises in response to externally applied loads.
Task:
- Common units on stress?
- Secondary Dimensions?
- Primary Dimensions?
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- Units. Pa, psi, N/m^2
- Secondary Dimensions: F/A = Force/Area, Mass*Acceleration/Area
- Primary Dimensions: M/L*T^2
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Task:
A 2000 pound weight hangs from a vertical 1 inch diameter steel rod. Caculate the average stress in the rod in SI units.
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- stress = force/area
- force is 2000 lbf = 8896.4 N
- \(A = \pi * D^2/4 = 0.0005067 \text{m}^2\)
- Thus, stress = 8896.4 N / 0.0005067 m^2 = 17.6 MPa