Application of Probability to Mechanical Design
139
Engineering Handbook, Society of Allied Weight Engineers, Los Angeles
(1976)
IT = I’L- J - J
where Ip - wpb2
12
WT = Weight Test Sample
W~, = Weight of Plate
T(r+~) - Period of vibration plate plus test sample
Tp - Period of vibration plate alone
Find Cv and 2.576 ~ir by a cart sort solution when
Wp = 14.343 lbs Wr = 29.625a lbs Tp = 1.1725 sec/cycle
Tr+e = 1.665 sec/cycle
and
weights to 4-0.01 grams and time to 4-0.01 sec
PROBLEM 2.7
A shear washer in Fig. Prob. 2.7 is to fail as a safety device through the
thickness, with an applied force 990 lbs 4- 10 lbs. Use
P
"Cult -- r~dt
with
d = 0.255 4- 0.005
t = t +0.001
P = 990 lbs 4- 10 lbs
Using a bronze with ~u/t 80,000 psi find t using Eq. (2.42) with the left hand
side t of 4- 4 for a safety device and compare with t for a structural member.
PROBLEM 2.8
A hardened steel pin Fig. Prob. 2.8 with 180,00 psi ultimate strength is
pressed into a 6061-T6 aluminum flange.
The pin diameter is