Select the correct answer. The most frequent maintenance task for a car is: A. Oil changes B. Tire replacements C. Coolant chang
2 answers:
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Answer:
the angle of twist of B with respect to D is -1.15°
the angle of twist of C with respect to D is 1.15°
Explanation:
The missing diagram that is supposed to be added to this image is attached in the file below.
From the given information:
The shaft is made of A992 steel. It has a diameter of 1 in and is supported by bearing at A and D.
For the Modulus of Rigidity G = 11 × 10³ Ksi = 11 × 10⁶ lb/in²
The objective are :
1) To determine the angle of twist of B with respect to D
Considering the Polar moment of Inertia at the shaft
shaft =
where ;
r = 1 in /2
r = 0.5 in
shaft =
shaft = 0.098218
Now; the angle of twist at B with respect to D is calculated by using the expression
where;
are the torques at segments CD and length at segments CD
are the torques at segments BC and length at segments BC
Also ; from the diagram; the following values where obtained:
= 2.5 in
= 0.098218
G = 11 × 10⁶ lb/in²
= -60 lb.ft
= 0 lb.ft
= 5.5 in
− 0.02 rad
To degree; we have
Since we have a negative sign; that typically illustrates that the angle of twist is in an anti- clockwise direction
Thus; the angle of twist of B with respect to D is 1.15°
(2) Determine the angle of twist of C with respect to D.Answer unit: degree or radians, two decimal places
For the angle of twist of C with respect to D; we have:
0.02 rad
To degree; we have
Answer:
(a) We are asked to compute the Brinell hardness for the given indentation. for HB, where P= 1000 kg, d= 2.3 mm, and D= 10 mm.
Thus, the Brinell hardness is computed as
(b) This part of the problem calls for us to determine the indentation diameter d which will yield a 270 HB when P= 500 kg.