The primary structure method is one of the effective methods to distinguish the primary stress and secondary stress. The knotty problem of stress classification can be solved by using the primary structure method and the equivalent linearization of stresses. The primary structure method has been successfully used to the finite element analyses with 2D axisymmetric elements and shell elements. A method to construct the primary structures with 3D solid elements is given in this paper, and the stress classification of cylindrical shell with nozzle is discussed in a new point view.

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