LPM concept

An appropriate image of the longest projection method of the shear variable decomposition can be obtained from the following figure:

The shear stress path is evaluated in different directions to which it is projected. The problematic case on the right picture above queries the case, where the mean shear stress is inadequately set. A better solution can be achieved by longest chord method (LCM), nevertheless if the value of mean shear stress/strain is not decisive in fatigue computation (this is the case of majority of methods in PragTic) the methods give the same shear stress/strain amplitude.

longest chord method (LCM )

minimum circumscribed circle method (MCCM)

minimum circumscribed ellipse method (MCEM)

This help file has been generated by the freeware version of HelpNDoc