Forces on Materials Homework: Q&A & Examples

[kai92]

Homework Statement

Some question about forces on materials:
1.What is "alternating load"?
2.What are the effect of forces (static,dynamic,impact,fatigue & alternating load) on materials?(Give an example for each force)
3.What are the limits of Hooke's Law?How does the graphs look like?

Please help me by answering them here or give me link of website contain information I needed.Thank you.

Homework Equations

The Attempt at a Solution

 

[jbsteele]

1. Alternating load is a type of force applied to a material that alternates between two directions, as opposed to a single, static force.2. Static Force: When a material is under a static force, it will remain in a constant state of tension and compression, depending on the direction of the force. For example, a bridge will experience a static force from the weight of the cars crossing it.Dynamic Force: When a material is subject to a dynamic force, it will experience changes in both its tension and compression, but in alternating directions. An example of a dynamic force on a material would be a bridge experiencing an earthquake.Impact Force: Impact forces are sudden, large forces that cause a material to deform rapidly. An example of an impact force on a material would be an object hitting a wall.Fatigue Force: Fatigue forces are repeated loads that cause a material to fail over time. An example of a fatigue force on a material would be the regular use of a bridge, causing it to deteriorate over time.Alternating Load: Alternating loads are forces that alternate between two directions, as opposed to a single, static force. An example of an alternating load on a material would be a bridge experiencing both wind and water pressure from different directions.3. The limits of Hooke's Law are that it only applies to linear materials (i.e., materials that do not undergo plastic deformation), and that it does not account for effects such as temperature and moisture. The graph of a Hooke's Law relationship looks like a straight line, with the slope representing the elastic modulus.