Engineering Fundamentals Flashcards

(11 cards)

1
Q

Deflection of beam with end load equation

A

d=FL^3/(3E*I)

Deflection = ForceLength^3/(3Modulus of Elasticity * Moment of inertia)

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2
Q

Rectangular Cross section moment of inertia equation (bending around x axis)

A

I=x*y^3/12

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3
Q

Rectangular Cross section moment of inertia equation (bending around y axis)

A

I=x^3*y/12

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4
Q

0th Law of Thermodynamics

A

If two systems, at thermal equilibrium with each other are in thermal equilibrium with a third system, all systems at in equilibrium with each other

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5
Q

1st Law of Thermodynamics

A

Conservation of Energy. It cannot be created or destroyed, only transferred from one form to another.

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6
Q

What are ways to maximize beam deflection?

A

Increase beam length, change beam shape and change material

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7
Q

Ways to minimize beam deflection

A

Decrease beam length, move force close to wall, change material, change beam shape

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8
Q

Define modulus of elasticity

A

Unit measurement of an objects resistance to being deformed elastically when stress is applied

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9
Q

Strain equation for cantilever snaps

A

Strain = (3yh) / (2L^2Q)

y= deflection of snap
h= height of the snap at the root
L= length of the snap
K= taper factor (>1)

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10
Q

Bending force equation for snaps

A

F= (E* b* h^3* y) / ( 4*L^3)

E=modulus of elasticity
b= width of the snap
h= height of the snap at the root
y= deflection
L= Length of the snap

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11
Q

Assembly push force of a snap

A

P= F * ( tan(alpha) + u) / ( 1- u * tan (alpha))

F= bending force for the cantilever snap
alpha= lead-in angle
u= friction coefficient

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