1
Q
What are the three types of forces and describe them
A
Compressive - Force acting to reduce size
Tensile- acting to elongate
Shear- displaced along axis parallel to applied force
2
Q
What is the equation for stress and strain
A
Stress = Force applied/cross sectional area
Strain = change in length/ original length
3
Q
What is Young’s modulus
A
Stress/Strain
Rigid = high stress little strain
Elastic = low stress high strain
4
Q
Define Proportional Limit
A
Ability to withstand stress without permanent deformation
5
Q
Define elastic modulus
A
Elastic modulus - straight line part of diagram
Steep = rigid (high) Shallow = elastic (low)
6
Q
Define UTS
A
Ultimate Tensile strength
Max force applied before a material elongates
