homework 2 solutions

# homework 2 solutions - 1 2 Callister 19.D1(Note that this...

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2. Callister 19.D1 (Note that this problem is in the "Design Problem" section at the end of the "Questions and Problems" section in Callister chapter 19.) 19.D1 Railroad tracks made of 1025 steel are to be laid during the time of year when the temperature averages 10°C (50°F). If a joint space of 4.6 mm (0.180 in.) is allowed between the standard 11.9-m (39-ft) long rails, what is the hottest possible temperature that can be tolerated without the introduction of thermal stresses? Solution For these railroad tracks, each end is allowed to expand one-half of the joint space distance, or the track may expand a total of this distance (4.6 mm). Equation 19.3a is used to solve for T f , where the value α l for the 1025 steel [12.0 × 10 -6 ( ° C) -1 ] is found in Table 19.1. Thus, solving for T f from Equation 19.3a leads to = 32.2 ° C + 10 ° C = 42.2 ° C (108 ° F)
3. After summer 2011 midterm exam: β -SiC is a ceramic material used in high-temperature applications. It has the so-called zinc blende structure (see adjacent diagram). This structure is FCC with a two-atom basis having Si at (0,0,0) and C at (1/4,1/4,1/4).

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