# Shell-to-solid coupling

 Surface-based shell-to-solid coupling: allows for a transition from shell element modeling to solid element modeling; is most useful when local modeling should use a full three-dimensional analysis but other parts of the structure can be modeled as shells; uses a set of internally defined distributing coupling constraints to couple the motion of a “line” of nodes along the edge of a shell model to the motion of a set of nodes on a solid surface; automatically selects the coupling nodes located on a solid surface lying within a region of influence; can be used with three-dimensional stress/displacement shell and solid (continuum) elements; does not require any alignment between the solid and shell element meshes; and can be used in geometrically linear and nonlinear analysis. The following topics are discussed:
 Related Topics Coupling constraints In Other Guides About surfaces *SHELL TO SOLID COUPLING Defining shell-to-solid coupling constraints

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