Page 15 - Mechanical Engineer's Data Handbook

4 MECHANICAL ENGINEER’S DATA HANDBOOK

Strains Failure may be due to any one of the following
stresses.
e, = a,/E,; e,, = ab/E,, (note that e, = e,,) (1 ) Tensile in rod a, = 4P/nDZ

a

F F
(2) Tensile in eye 6, = P/(Do - D,)b

I. I .4 Stresses in knuckle joint
The knuckle joint is a good example of the application
of simple stress calculations. The various stresses
which occur are given.
Symbols used:
P = load
a, = tensile stress (3) Shear in eye z=P/(D,-D,)b
a,, = bending stress
a, =crushing stress
7 =shear stress p-$gPp
D = rod diameter
D, = pin diameter
Do = eye outer diameter 9
approx
a=thickness of the fork
b = the thickness of the eye

i
(4) Tensile in fork a, = P/(Do - D,)2a
a a

(5) Shear in fork T= P/(Do-Dp)2a

p+@~~L,p