HyperMesh and BatchMesher

Find Attached (Tied)

Find Attached (Tied)

Previous topic Next topic No expanding text in this topic  

Find Attached (Tied)

Previous topic Next topic JavaScript is required for expanding text JavaScript is required for the print function  

Find Attached (Tied) is an option that you can use to find elements that are connected to displayed elements. Tied elements are those that are tied to each other, but are not attached physically. This option differs from the Find Attached option, which returns elements that are physically attached to each other via common nodes.

Location

Find Attached (Tied) is available for the LS-DYNA user profile on the QA/Model Utility menu:

Find_attached_tied2

The relationship between tied elements is defined using the following CONTACT keywords:

Element Type

Contact Keywords

ContactSpotweld

*CONTACT_SPOTWELD

NodesToSurface

*CONTACT_TIED_NODES_TO_SURFACE

*CONTACT_TIEBREAK_NODES_TO_SURFACE

*CONTACT_TIED_SHELL_EDGE_TO_SURFACE

SurfaceToSurface

*CONTACT_TIEBREAK_SURFACE_TO_SURFACE

*CONTACT_TIED_SURFACE_TO_SURFACE

SlidingOnly

*CONTACT_SLIDING_ONLY

ConstdTieBreak

*CONSTRAINED_TIE-BREAK

XtraNode

*CONSTRAINED_EXTRA_NODES_NODE

*CONSTRAINED_EXTRA_NODES_SET

TiedNodes

*CONSTRAINED_TIED_NODES_FAILURE

ConstRigidRbody

*CONSTRAINED_RIGID_BODIES

Features

Find Attached (Tied) returns any tied elements connected via TIED_CONTACTS as defined using LS-DYNA.
You can perform a Find Attached (Tied) operation on one or more displayed elements or components.
Element input and output is based on dimension as follows:

INPUT (displayed)

Output (attached or tied)

1D/3D elements

2D elements

2D elements

1D/3D elements

2D elements

2D elements

Note:  For ContactSpotweld, the 1st and 2nd use case is valid.

Use Cases

Following are two use cases for Find Attached (Tied):

Use Case 1:

Two independent beam nodes are connected to a common layer.

Result:

If you start with the green shell and 1D beam in image 1., then the Find Attached (Tied) operation returns the elements in the following sequence:
 


1.

UC1_img1


2.

UC1_img2


3.

UC1_img3


4.

UC1_img4

 

Use Case 2:

A common node between two 1D elements.

Result:

If you start with the 1D beam in image 1., then the Find Attached (Tied) operation returns the elements in the following sequence:
 


1.

UC2_img1


2.

UC2_img2


3.

UC2_img3

 

Note: The Find Attached (Tied) option works with displayed elements only.