Stress, Strain and Elastic Strain Energy Flashcards
If forces stretch the material they are…
Tensile forces
If forces squash the material they are…
Compressive forces
What is Stress defined as?
Force applied divided by the cross-sectional area.
What are the units of Stress?
Nm-2 or Pa
What is strain defined as?
The change in the length (extension) divided by the original length of the material.
What is the Stress equation?
σ = F/A
What is the Stress symbol?
σ
What is the Strain equation?
ε
What are the units of Strain?
Has NO units, its a ratio and is written as a number, can be written as a %
Does it matter what equation to use if the forces a Compressive or Tensile?
NO
What is the difference when dealing with Tensile and Compressive forcees?
Tensile forces are Positive Compressive forces are negative
What is the stress that is big enough to break the material called?
The breaking stress
What happens to the stress as the tensile force increases?
Stress increases
What is point B on the Stress Strain Graph?
The breaking stress
What is the point UTS on the graph?
- Is the Ultimate Tensile Stress
- Is the maximum stress a material can withstand
Where is the elastic strain on a Force Extension Graph?
Is the area under a Force - Extension Graph
