Mechanical Properties of Metals Flashcards
Name mechanical properties
Strength, hardness, ductility, stiffness
Name mechanical property tests
Tension, compression, impact, bending, shear, torsion, hardness
What is a standardised test?
An industry test which is commonly utilised
What is the uniaxial tension test?
A constant load velocity is applied to a specimen which is destroyed but the end of the test
What do we use to interpret the output of the uniaxial tension test?
A stress-strain curve
What material properties can be derived from the stress-strain curve?
Young’s modulus, ultimate tensile strength, yield strength, fracture strength, strain toughness,
What is pure stress?
The force applied perpendicular to the measured original area
What is pure strain?
Change in length divided by original length %
When are stress and strain positive and when are they negative?
Positive under tension, negative under compression
What is shear stress?
Tau, the force applied parallel to the measured original area.
What is shear strain?
Gamma=tau * shear modulus (G) * strain angle (theta)
Where is the elastic zone?
The section of the stress-strain diagram up to the yield strength
What is elastic strain?
It is reversible, when the load is removed the specimen returns to its original shape. It is linear
Elastic deformation follows which law?
Hooke’s Law
What is Hooke’s Law?
Stress = Young’s modulus (E) * strain
