RSSCON

Bulk Data Entry

RSSCON – Shell-to-Solid Element Connector

Description

Defines multi-point constraints to model clamped connections of shell-to-solid elements.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
RSSCON	RBID	TYPE	ES1	EA1	EB1	ES2	EA2	EB2

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
RSSCON	110	GRID	11	12	13	14	15	16

Field	Contents
RBID	Unique element identification number. No default (Integer > 0)
TYPE	Type of connectivity. ELEM - connection is described with element identification numbers. GRID - connection is described with grid point. Default = ELEM (GRID or ELEM)
ES1	Shell element identification number, if TYPE = ELEM. Shell grid point identification number, if TYPE = GRID. No default (Integer > 0)
EA1	Solid element identification number, if TYPE = ELEM. Solid grid point identification number, if TYPE = GRID. No default (Integer > 0)
EB1	Solid grid-point identification number, if TYPE = GRID only. Default = blank (Integer > 0 or blank)
ES2	Shell grid-point identification number, if TYPE = GRID only. Default = blank (Integer > 0 or blank)
EA2	Solid grid-point identification number, if TYPE = GRID only. Default = blank (Integer > 0 or blank)
EB2	Solid grid-point identification number, if TYPE = GRID only. Default = blank (Integer > 0 or blank)

Comments

RSSCON generates a multipoint constraint that models a clamped connection between a shell and a solid element. The shell degrees-of- freedom are considered dependent. The translational degrees-of- freedom of the shell edge are connected to the translational degrees-of- freedom of the upper and lower solid edge. The rotational degrees-of-freedom of the shell are connected to the translational degrees-of-freedom of the lower and upper edges of the solid element face. Poisson’s ratio effects are considered in the translational degrees-of-freedom.

The shell grid point must lie on the line connecting the two solid grid points. It can have an offset from this line, which can not be more than 5% of the distance between the two solid grid points. The shell grid points that are out of the tolerance will not be constrained, and a fatal message will be issued. This tolerance is adjustable. Refer to PARAM,TOLRSC and PARAM,SEPIXOVR.

3.	When using the TYPE = ELEM option:

•	The elements may be first or second order

•	When a straight shell element edge and a solid element are connected, the geometry of the shell edge is not changed to fit the solid face. When a curved shell element edge and a solid element are connected, the two solid edges and solid face are not changed to match the shell edge.

•	It is not recommended to connect more than one shell element to the same solid using the ELEM option. If attempted, conflicts in the multipoint constraint relations may lead to UFM 6692.

4.	When using TYPE = GRID option:

•	The GRID option does not verify that the grids used are valid shell and/or solid grids

•	The GRID option is not recommended for 2nd order elements

5.	It is recommended that the height of the solid element’s face is approximately equal to the shell element’s thickness of the shell. The shell edge should then be placed in the middle of the solid face.

6.	The shell edge may coincide with the upper or lower edge of the solid face.

7.	The RSSCON entry, unlike MPCs, is part of the model and does not need to be selected in a subcase definition.

8.	RSSCON is ignored in heat-transfer problems.

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