18. Bela is doing a continuity test. What's he checking?
1 answer:
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Complete question:
A rod consisting of two cylindrical portions AB and BC is restrained at both ends. Portion AB is made of steel (Es = 200 GPa and αs = 11.7 × 10-6/°C) and portion BC is made of brass (Eb = 105 GPa and αb = 20.9 × 10-6/°C). (diameter of AB is 30mm, Length of AB is 250 mm) and (diameter of BC is 50mm, Length of BC is 300 mm).
Knowing that the rod is initially unstressed, determine the compressive force induced in ABC when there is a temperature rise of 55°C
Answer:
The compressive force induced in ABC is 156.902 kN
Explanation:
Area of portion AB:
= 7.0695 X 10⁻⁴ m²
Area of portion BC:
= 1.96373 X 10⁻³ m²
Free thermal expansion:
= (0.25)(11.7 X 10⁻⁶)(55) + (0.3)(20.9 X 10⁻⁶)(55)
= 505.725 X 10⁻⁶m
Shortening due to induced compressive force P:
= 1.7682 X 10⁻⁹P + 1.455 10⁻⁹P
= 3.2232 X 10⁻⁹P
For zero net deflection,
∴ 3.2232 X 10⁻⁹P = 505.725 X 10⁻⁶
P = 156.902 X 10³ N = 156.902 kN
Therefore, the compressive force induced in ABC is 156.902 kN
Answer:
C. Zinc Blende
Explanation:
Out of the three possible crystal structures, only Zinc Blends is the unit cell structures which have four formula. Units per unit cell.
Therefore Zinc Blende is the only possible unit structures of AX ceramic material.
Go through the attached file for further details as to how I came up with the answer.
