ch01-03 stress & strain & properties
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02 Solutions 46060 5/6/10 1:45 PM Page 3<br />
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2–6. Nylon strips are fused to glass plates. When<br />
moderately heated the nylon will become soft while the<br />
glass stays approximately rigid. Determine the average<br />
shear <strong>strain</strong> in the nylon due to the load P when the<br />
assembly deforms as indicated.<br />
3 mm<br />
y<br />
2 mm<br />
P<br />
5 mm<br />
3 mm<br />
5 mm<br />
3 mm<br />
x<br />
g = tan - 1 a 2 b = 11.31° = 0.197 rad<br />
10<br />
Ans.<br />
2–7. If the unstretched length of the bowstring is 35.5 in.,<br />
determine the average normal <strong>strain</strong> in the string when it is<br />
stretched to the position shown.<br />
18 in.<br />
6 in.<br />
18 in.<br />
Geometry: Referring to Fig. a, the stretched length of the string is<br />
L = 2L¿ =2218 2 + 6 2 = 37.947 in.<br />
Average Normal Strain:<br />
e avg = L - L 0 37.947 - 35.5<br />
= = 0.0689 in.>in.<br />
L 0 35.5<br />
Ans.<br />
3
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