Unformatted text preview: Sec_2.8-2.12.qxd 9/25/08 11:44 AM Page 227 SECTION 2.10 Stress Concentrations Solution 2.10-3 Flat bar in tension d
t allowable tensile stress Find Pmax
Find K from Fig. 2-64
Pmax s nom ct smax
K d)t st
bt a 1
Because t, b, and t are constants, we write:
K K P* 0
t 227 3.00
0.268 We observe that Pmax decreases as d/b increases.
Therefore, the maximum load occurs when the hole
becomes very small.
Pmax and K : 3 b
3 ; d
b Problem 2.10-4 A round brass bar of diameter d1 20 mm has
upset ends of diameter d2 26 mm (see figure). The lengths of
the segments of the bar are L1 0.3 m and L2 0.1 m.
Quarter-circular fillets are used at the shoulders of the bar, and
the modulus of elasticity of the brass is E 100 GPa.
If the bar lengthens by 0.12 mm under a tensile load P, what is
the maximum stress max in the bar?
Probs. 2.10-4 and 2.10-5 ...
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- Fall '11
- Stress, Tensile strength, elastic modulus, 0.12 mm, maximum stress max