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svetlana [45]
4 years ago
15

Unidirectional and continuous carbon fibers with a diameter of 6.5 micron are embedded within an epoxy that offers a yield point

of 73 MPa. If the bond strength across the fiber-epoxy interface is 32 MPa, compute the minimum fiber length to guarantee that the fibers are conveying an optimum fraction of force that is applied to the composite. Answer Format: X.XX Unit: mm
Engineering
1 answer:
polet [3.4K]4 years ago
3 0

Answer:

L=0.0074 mm

Explanation:

Given that

d= 6.5 micron meter

d= 6.5 x 10⁻³ mm

Yield strength ,Sy = 73 MPa

Bond strength ,σ = 32 MPa

The fiber length given as

L=\dfrac{S_y \times d}{2 \times \sigma }

By putting the values

L=\dfrac{S_y \times d}{2 \times \sigma }

L=\dfrac{73 \times 6.5\times 10^{-3}}{2\times 32 }\ mm

L=0.0074 mm

Therefore the minimum fiber length is 0.0074 mm.

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Two plates are separated by a 1/4 in space. The lower plate is stationary; the upper plate moves at 10 ft/s. Oil (viscosity of 2
Montano1993 [528]

Answer:

τ = 0.25 lbf/in²

Explanation:

given that the oil viscosity, μ =  2.415 lb/ft-s

gap between plates = 1/4 inches = 1/4*12 = 1/48 ft

recall from newtons law of viscosity;

shear stress τ = μ du/dy =

  τ = (2.415 lb/ft-s) (10 ft/s)/(1/48) ft

τ = 1159.2 lb/ft-s²

we know that, 1 slug = 32.174 lb

lb = 1/32.174 slug

∴  τ = 1159.2/32.174 slug/ft-s² = 36 slug/ft-s²

τ = 36 slug/ft-s²

multiply both the numerator and denominator by ft, this gives

τ = 36 slug-ft/ft²-s²

τ = 36 lbf/ft² where 1 slug-ft/s² = 1lbf

since 1 ft = 12 inch = 1 ft² = 12² in² = 144 in²

∴  τ = 36/144 lbf /in² = 0.25 lbf/in²

τ = 0.25 lbf/in²

6 0
3 years ago
Why do computers use 1 and 0
tangare [24]

I like ya cut g

Explanation:

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6 0
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Rewrite the following nested if-else statement as a switch statement that accomplishes exactly the same thing. Assume that num i
seropon [69]

Answer:

Answer explained below

Explanation:

The following is the nested if-else statement:

% if-based statement

if num < -2 ||  num > 4

          f1(num)

else

     if num <=2

          if num >= 0

              f2(num)

          else

              f3(num)

          end

     else

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     end

end

<u>NOTE:</u> the num is an integer variable that has been initialized and that there are functions f1, f2, f3 and f4.

   

The nested if-else statement can be replaced by switch statement as shown below:

switch num

    case(0, 1, 2)

         f2(num)

    case(-2, -1)

         f3(num)

    case(3, 4)

         f4(num)

    otherwise

         f1(num)

In this case, the switch based code is easier to write and understand because the cases are single valued or a few discrete values (not ranges of values)

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stiks02 [169]

Answer:

ABS

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4 years ago
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devlian [24]

Explanation:

The wind is an actual form of solar energy. winds are caused by the heating of the atmosphere by the sun, the rotation of the earth, and the earth's surface irregularities. The wind is capture in a wind turbine which provides a renewable energy source, the wind makes the rotor spin, as the rotor spins the movement of the blades drives a generator that creates energy, also known as wind power. The average wind efficiency of turbines is between 35-45%.

Advantages of wind power

- Wind power is cost-effective

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