/INTER/LAGMUL/TYPE7

Block Format Keyword

/INTER/LAGMUL/TYPE7 - Lagrange Multiplier Interface Type 7

Description

Describes the Lagrange multiplier interface TYPE7. Multi usage impact interface between a master surface and a list of slaves nodes. All limitations encountered with interfaces TYPE3 and TYPE5 are solved with this interface:

•	A node can be at the same time a slave and a master node.

•	Each slave node can impact each master segment; except if it is connected to this segment.

•	A node can impact on more than one segment.

•	A node can impact on the two sides, on the edges and on the corners of each segments.

•	Fast search algorithm without limitations. Time step is not reduced.

The main limitations are:

•	Friction models are not yet implemented

•	It is not compatible with any standard kinematic conditions

•	It is not compatible with SPMD parallel version

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
/INTER/LAGMUL/TYPE7/inter_ID
inter_title
grnd_IDs	surf_IDm
Blank Format
Blank Format
				Gapmin
								Bumult
Blank Format

Field	Contents
inter_ID	Interface identifier (Integer, maximum 10 digits)
inter_title	Interface title (Character, maximum 100 characters)
grnd_IDs	Slave nodes group identifier (Integer)
surf_IDm	Master surface identifier (Integer)
Gapmin	Minimum gap for impact activation (Real)
Bumult	Sorting factor - used to speed up the sorting algorithm. Default set to 0.20 (Real)

1.	The defined nodes must have non-zero mass.

2.	The Gapmin may be smaller than non-Lagrange interface type 7. It is used in order to determine if a slave node is in contact or not.

3.	The default value for Bumult is automatically increased to 0.30 for models which have more than 1.5 million nodes and to 0.40 for models with more than 2.5 million of nodes.