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week 1 info Flashcards

1
Q

what is a metal?

A

an element that gives off one or more electrons

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2
Q

what is a ceramics?

A

type of solid which is held in an ionic or covalent bonding

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3
Q

what is a polymer?

A

type of plastic

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4
Q

composites?

A

a type of metal that is made of several elements that have been combined

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5
Q

semiconductors

A

this is a metal which is able to

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6
Q

what are the 4 properties of metal?

A

physical, mechanical, chemcial, electrical

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7
Q

what is a physical property?

A

physical properties are those that can be observed without changing the identity of the substance

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8
Q

what is a mechanical property

A

reaction of a material to the application of external force

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9
Q

what is a chemical property?

A

A chemical property is a characteristic or behavior of a substance that may be observed when it undergoes a chemical change or reaction

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10
Q

6 important properties for an engineer

A 
strength
ductility 
impact resistance
fatigue
temperature 
conductivity
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11
Q

4 important properties for density

A

structure
size
porosity - how easy fluids can go through the material
moisture content

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12
Q

stress formula and what is it

A

stress - force / area, stress is the magnitude if the applied force

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13
Q

what is elastic deformation

A

when a material is able to recover once the force applied has been removed

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14
Q

what is plastic deformation

A

this is when the force applied to a material causes the material to deform even once the force has been removed

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15
Q

what is strain and fomula

A

strain is the deformation of a solid due to stress, stress = change in lenght / orginal length

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16
Q

what is shear strain

A

this is the stress in parallel to the cross sectional area if the material

17
Q

tensile test graph

A

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

18
Q

what is youngs modulus and units used

A

this is the measure of a solid’s stiffness to elastic deformation under load. Units: (E) Gpa 10 to the power of 9

19
Q

what is yield point

A

the max limit to elastic behavior

20
Q

what is unlimate tensile strength

A

the max value of stress

21
Q

what is percentage elongation

A

the change in length from orginal

materials (10 decks)

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