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Mechanical Science > WEEK 2 NOTES > Flashcards

WEEK 2 NOTES Flashcards

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1
Q

What is strain a measure of?

A

How much a material has stretched/ how much an object has changed shape

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2
Q

What is the equation for strain?

A

Strain = Change in length/original length

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3
Q

What is stress a measure of?

A

The intensity of force on an area, so basically the pressure on an object

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4
Q

What is the equation for stress?

A

Stress = Force/Area

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5
Q

What is the equation for youngs modulus, E?

A

E = stress/strain

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6
Q

What is young modulus, E a measure of?

A

A measure of how stiff/strong a material is, e.g. how much is stretches/compresses when loaded.
The more stiff the less stretch

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7
Q

What is the equation for change in extension when you have an areas dimensions and youngs modulus?

A

Change in extension = Force x length/ E x Area

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8
Q

What does E stand for?

A

Youngs modulus

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9
Q

What is the equation for the spring constant when you have youngs modulus?

A

K = E x area/ length

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10
Q

Where is force applied in tensile and compressional stress?

A

Force is applied perpendicular to the surface

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11
Q

Where is force applied in shear stress?

A

Force is applied parallel to the surface.

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12
Q

Where is force applied in bulk stress?

A

Force is applied equally in all directions but also perpendicular to the surface

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13
Q

What is the equation for shear stress?

A

Shear stress (𝜏) = Force/ Area

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14
Q

What is the equation for shear strain?

A

Shear strain = ∆𝑥/ L = tan y
∆𝑥 is the distance of lean
L is the original length
y = the angle

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15
Q

What is the equation for shear modulus (G)?

A

G = shear stress/ y
y= angle

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16
Q

What does tensile force mean?

A

A downwards force/ a pulling force

17
Q

What is pure shear?

A

When the intensity of force is very large it causes the object which the force is exerted on to break

18
Q

What is pure bending?

A

When a material is more elastic a force will cause one end to stretch/ go into tension and the other end to go into compression

19
Q

What is the equation for bulk stress?

A

Bulk stress = F/A = P

20
Q

What is the equation for bulk strain?

A

Bulk strain = new vol- original vol/ V

21
Q

What is the ultimate tensile strength/UTS?

A

The maximum stretching stress you can apply before breaking occurs

22
Q

What is the equation for factor of safety?

A

UTS/ maximum stress

23
Q

What is the factor of safety a measure of?

A

A measure of how much stronger a structure is than the forces applied to it

24
Q

What is the relationship with stiffness and youngs modulus?

A

The stiffer/tougher something is the higher the young modulus

Mechanical Science (3 decks)

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