Deformable Bodies and Mechanical Energy Flashcards
What is elastic deformation?
Without permanent deformation when force removed
What is plastic deformation?
Permanently deformed
What does isotropy mean?
Behave identically in different directions
What is ductility?
- The extent of the plastic deformation zone
- Ductility is a material’s ability to deform under tensile stress.
What is the constitutive law?
That σ ∝ ε
What is the proportionality limit?
Yield stress
What is the Poisson’s ratio effect?
A strain in one direction causes strains in other directions
What are auxetic materials?
Materials stretched and become thicker in the transverse direction (ν < 0)
What does the poissons ratio describe?
The proportion of strain passively induced in an orthogonal direction to the principal strain.
What is the equation for a linearly elastic rotational spring?
M = cθ
What is potential energy?
- Gained if a body is moved in the opposite direction to an internally applied force
What is a conservative force?
If the work done by the force depends only on the body’s net change in position and not on the path followed
