kmu479+12.hafta Flashcards
(24 cards)
What is the name of the university and department?
Hacettepe University, Department of Chemical Engineering
Who is the contact person for the Department of Chemical Engineering?
Öznur Çakmak, PhD
oznurcakmak@hacettepe.edu.tr
What is the focus of the course mentioned?
Mechanical Properties of Metals
What must be known about materials when subjected to forces?
The characteristics of the material and to design the member to prevent excessive deformation and fracture.
What does the mechanical behavior of a material reflect?
The relationship between its response or deformation to an applied load or force.
What are the key mechanical design properties?
Stiffness, strength, hardness, ductility, and toughness.
What is the purpose of a stress–strain test?
To ascertain the mechanical behavior of a material under a static or slowly changing load.
What are the three principal ways in which a load may be applied?
Tension, compression, and shear.
How is a tension test conducted?
A specimen is deformed to fracture with a gradually increasing tensile load applied uniaxially along its long axis.
What is the typical shape of a tensile specimen?
Normally circular, but rectangular specimens are also used.
What does a tensile testing machine measure?
The instantaneous applied load and the resulting elongations.
What is engineering stress?
Defined as the instantaneous load applied perpendicular to the specimen’s cross section divided by the original cross-sectional area.
What is the relationship for engineering stress?
Engineering stress = F / A0
Where F is the instantaneous load and A0 is the original cross-sectional area.
What is a compression test?
Conducted similarly to a tensile test, but the force is compressive and the specimen contracts along the direction of stress.
What is shear stress?
Computed according to the applied shear force.
What is torsion in materials?
A variation of pure shear where a structural member is twisted.
What does Hooke’s law describe?
The relationship between engineering stress and engineering strain for elastic deformation.
What is the modulus of elasticity?
A measure of a material’s resistance to elastic deformation.
What happens to a material after elastic deformation?
It returns to its original shape when the applied load is released.
What is Poisson’s ratio?
The ratio of the lateral and axial strains in isotropic materials.
What is plastic deformation?
Permanent, nonrecoverable deformation that occurs when stress exceeds the yield strength.
What is the yield strength?
The average stress associated with the lower yield point after yielding.
What is necking in materials?
The phenomenon where a small constriction forms at some point during maximum stress, leading to fracture.
What is the tensile strength?
The maximum stress that can be sustained by a structure in tension before fracture occurs.
