Tensile Stress Flashcards
What is tensile strength of a material?
It is determined by the tension test which consists of the gradual application of an axial tensile force until fracture occurs.
What is STRENGTH (or stress)?
It’s the ability of the material to withstand applied force without failure.
What does UTS stand for?
Ultimate Tensile Strength or Stress
UTS (N/mm2 or MPa) =
maximum tensile force applied divided by the initial cross-sectional area
Cross-sectional area =
pi • diameter to power of two, divided by 4
What is direct stress (f)?
It’s the intensity of force distribution over the cross-sectional area of the material subjected to direct load. It’s expressed in MPa.
f (stress in MPa) =
A (cross-sectional area) in mm2
The unit of direct stress (f) is
pascal (Pa)
How many Pa is a MPa?
1 million Pa equals a MPa
What is a Pascal (Pa)?
It is force (Newton) by area (m2).
MPa = N / mm2
FS (Factor of Safety) =
f (working stress)
What is axial strain (e)?
It is the elongation per unit of original length.
e (strain) =
l ( original length)
What’s the elastic limit?
It is a limit in which the material possesses the property of elasticity, or the ability to return to its original size after the force has been removed.
What’s plasticity?
It is when a material suffers permanent deformation until eventually rupture occurs at what we already know to be the ultimate stress.
