12 Strength Analysis of a Plate Heat Exchanger …
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Fig. 12.3 Loads and
constraints in case 2
Fig. 12.4 Mises equivalent
stress distribution under load
case 1
The Mises equivalent stress in case 1 is 154.55 MPa which is located at the
connection zone between the square-circle transition shell and connecting plate. The
maximum Mises equivalent stress in case 2 is 189.15 MPa which is located at the
T-shaped ribs.
According to Elastic Stress Analysis Method, Mises equivalent stresses should be
categorized into General Primary Membrane Equivalent Stress (P m ), Local Primary
Membrane Equivalent Stress (P L ), Primary Membrane (General or Local) Plus
Primary Bending Equivalent Stress (P L + P b ) and Primary Membrane (General
or Local) Plus Primary Bending Equivalent Stress Plus secondary Equivalent Stress
(P L + P b + Q). For calculating the equivalent stresses, the total stress shall be