week 1 info Flashcards
what is a metal?
an element that gives off one or more electrons
what is a ceramics?
type of solid which is held in an ionic or covalent bonding
what is a polymer?
type of plastic
composites?
a type of metal that is made of several elements that have been combined
semiconductors
this is a metal which is able to
what are the 4 properties of metal?
physical, mechanical, chemcial, electrical
what is a physical property?
physical properties are those that can be observed without changing the identity of the substance
what is a mechanical property
reaction of a material to the application of external force
what is a chemical property?
A chemical property is a characteristic or behavior of a substance that may be observed when it undergoes a chemical change or reaction
6 important properties for an engineer
strength ductility impact resistance fatigue temperature conductivity
4 important properties for density
structure
size
porosity - how easy fluids can go through the material
moisture content
stress formula and what is it
stress - force / area, stress is the magnitude if the applied force
what is elastic deformation
when a material is able to recover once the force applied has been removed
what is plastic deformation
this is when the force applied to a material causes the material to deform even once the force has been removed
what is strain and fomula
strain is the deformation of a solid due to stress, stress = change in lenght / orginal length
what is shear strain
this is the stress in parallel to the cross sectional area if the material
tensile test graph
https://www.google.com/url?sa=i&source=images&cd=&cad=rja&uact=8&ved=2ahUKEwirrIK8o-_kAhVPzoUKHRniB_YQjRx6BAgBEAQ&url=%2Furl%3Fsa%3Di%26source%3Dimages%26cd%3D%26ved%3D%26url%3Dhttps%253A%252F%252Fwww.toppr.com%252Fguides%252Fphysics%252Fmechanical-properties-of-solids%252Fhookes-law-and-stress-strain-curve%252F%26psig%3DAOvVaw1tQWsl6P92Cy_z9E1h36JJ%26ust%3D1569614375762055&psig=AOvVaw1tQWsl6P92Cy_z9E1h36JJ&ust=1569614375762055
what is youngs modulus and units used
this is the measure of a solid’s stiffness to elastic deformation under load. Units: (E) Gpa 10 to the power of 9
what is yield point
the max limit to elastic behavior
what is unlimate tensile strength
the max value of stress
what is percentage elongation
the change in length from orginal
