Physical Properties Flashcards
Define the words Load Force Stress Strain by using them in the same sentence.
A load is applied to a material which exerts a force on the material which produces a stress within a material and
associated strain
What are the units for Load?
Kilograms (Kg)
What are the units for Force?
Newton (N)
Name 3 types of forces
- Uniaxial (single axis)
- Biaxial (2 perpendicular axis)
- Triaxial (equal in all directions)
Name 3 uniaxial forces
- Tensile
- Compressive
- Shear
What are the units for stress?
Pa
What are the units for strain?
No units
What is the measure of stiffness
Young’s modulus (E)
State Hooke’s Law
Stress (σ) is proportional to strain (ε)
What is compliance a measure of?
- Softness
- 1/E (reciprocal to stiffness)
What is the proportional limit on an stress-strain curve?
The limit when even if the load is removed the material is permanently damaged
What is the ultimate tensile strength on an stress-strain curve?
The fracture point where the material breaks apart
What is the yield point on an stress-strain curve?
The point above which strain will increase even with no further increase in stress
What is the elastic region on an stress-strain curve?
Region where, if stress is removed the original shape is recoverable
What is the plastic region on an stress-strain curve?
Region where, if stress is removed the material is permanently deformed
