Podcast
Questions and Answers
Which type of force is present in an axially loaded bar?
Which type of force is present in an axially loaded bar?
- Torsional force
- Tangential force
- Shear force
- Normal force (correct)
In which situations can a bar experience normal stress?
In which situations can a bar experience normal stress?
- When pulled (tension) or compressed (correct)
- When sheared
- When bent
- When twisted
When is the stress in a bar constant and uniform across the cross-sectional area?
When is the stress in a bar constant and uniform across the cross-sectional area?
- When every point deforms the same amount (correct)
- When there are multiple internal forces present
- When every point deforms differently
- When the bar is twisted
What assumptions is the equation for normal stress (σ = P/A) based on?
What assumptions is the equation for normal stress (σ = P/A) based on?
Why is the stress distribution different near the concentrated load compared to far away in an axially loaded bar?
Why is the stress distribution different near the concentrated load compared to far away in an axially loaded bar?
Flashcards
Normal force
Normal force
A force acting perpendicular to a surface, like the force pulling or pushing on a bar.
Normal stress
Normal stress
The internal resistance of a material to deformation, specifically caused by the normal force acting perpendicular to a surface.
Uniform stress distribution
Uniform stress distribution
When the stress experienced by the material throughout the cross-section is the same.
Material homogeneity and isotropy
Material homogeneity and isotropy
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Stress distribution in an axially loaded bar
Stress distribution in an axially loaded bar
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Study Notes
- Normal stress in an axially loaded bar is discussed, where there is only an internal normal force present.
- In such cases, the bar is either being pulled (tension) or compressed, with examples like trusses, legs when standing still, trees, chair legs, etc.
- The stress in the bar is important to determine when it will break.
- The stress is constant and uniform across the cross-sectional area when every point deforms the same amount.
- The equation for normal stress (σ = P/A) is based on assumptions of material homogeneity and isotropy.
- The equation applies at locations with uniform deformation and is an average normal stress.
- The stress distribution is different near the concentrated load compared to far away due to the contribution of particles in distributing the load.
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Description
Explore concepts of normal stress in axially loaded bars, where internal normal force causes tension or compression. Learn about applications like trusses, trees, and chair legs, and how stress distribution varies near concentrated loads. Understand the equation σ = P/A for calculating normal stress.
