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The parabolic failure criterion is defined by
where m is the ratio of compressive stress to tensile stress.
Example
Figure 4.1 [1] shows a press fit assembly consisting of a metal shaft and a hub made of
POM. The joint strength can be determined as follows:
For the numerical values rJrY = 1.6 and p = 22 N/mm 2 the equivalent stress is to be
calculated.
The tangential stress Gx is given by
Substituing the values above
The radial compressive stress G1 is
Figure 4.1 Stress analysis in a press fit hub
(N]
(4.7)
(4.8)
(4.9)