Threaded connections with clearance are calculated according to the following criteria:
Threaded connections without clearance are calculated according to the following criteria:
Welded butt joints are calculated from the condition of static and fatigue strength for normal stresses.
Welded lap joints are calculated according to the condition of static and fatigue strength for shear stresses.
Welded tee joints with a butt weld are calculated based on the condition of static and fatigue strength for normal stresses.
Welded tee joints with a fillet weld are calculated from the condition of static and fatigue strength in terms of shear stresses.
Welded fillet joints are calculated from the shear stress strength condition.
Spot welds are calculated based on static shear strength.
Cylindrical and conical joints with an interference fit are calculated according to the criterion of static strength, as well as the conditions of non-opening of the joint and immovability.
Keyed, splined and profile connections are calculated for the crushing strength of the contact surfaces.
Terminal connections are calculated according to the immovability criterion.
Pin connections are calculated according to the condition of shear and crushing strength.
It should be noted that in order to improve the accuracy of calculations in the calculations of the most critical connections, you can use not only engineering methods, but also the FEM (finite element method) – such calculations can be performed using the APM Structure3D module .