This realization creates hexa clusters between shell components. Contacts get defined
between the shell components and the appropriate hexa nodes. A heat affected zone for
the shells from ultra high strength steel material is also created.
It can be used for any amount of parallel combinations of shell components. Figure 1. Heat Affected Zone Dimensions
This realization uses the prop_rad_acm_shellgapcoating.tcl property
script.
Organization and Definition of ACM (Shell Gap Contact and Coating)
For each connected link the contact /inter/TYPE2/ gets created and is named
TYPE2_CONTACT_PID_<link ID>. The following sets are created and
referenced.
MAINPART_SET_PID_<link ID>: In this set, which is referenced as
the main by the above mentioned contact, the link entities like the
component get organized.
SECONDARYNODE_SET_PID_<link ID>: In this set, which is referenced
as the secondary by the above mentioned contact, the hexa nodes
projecting onto the master entities get organized.
For each link combination the hexa clusters are organized into separate
components and named RAD_SOLID_SPOTWELD_PID_<link1 ID>_<link2 ID>. All
components are assigned the following material and property:
RAD_SOLID_SPOTWELD_DEFAULT_MAT. This material is defined as
/MAT/LAW59/.
RAD_SOLID_SPOTWELD_DEFAULT_PROP. This property is defined as
/PROP/CONNECT/.
The default values are read from
uhss_washersolid_matprop.rad in the
installation.
The heat affected zone elements (washer) are organized into one separate
component for each link from the ultra high strength steel material and
named RAD_WASHER_PID_<link ID>. All components are assigned the following
material and property:
RAD_WASHER_MAT. This material is defined as
/MAT/PLAS_JOHNS/.
RAD_WASHER_PROP. This property is defined as
/PROP/SHELL/.
The material and property
values are read from
uhss_washersolid_matprop.rad in the
installation.
Defining Materials for Heat Affected Zone Treatment
You must specify which materials are considered as ultra high strength materials.
When defining an acm (shell gap contact and coating) connector, the UHSS Material
Option can be selected for individual connectors using the Connector Entity Editor.
From current model
Select an existing material from the current model.
From search file (default)
For acm (shell gap contact and coating) realizations, the material
search file name is materialsnippets.txt. HyperMesh searches for this file in the following
locations and in the following order:
Current working folder:
[CURRENTWORKINGDIR]/materialsnippets.txtv Figure 2. From Search File
In the Connector Entity Editor, the UHSS
Material File field is populated with the name of the file that was
found last.
The text file contains snippets from the material names, which need to
receive heat affected zones during the realization.
From connector metadata
Once a connector is realized with the UHSS Material Option “From search
file”, the folder name is written as metadata to the connector in a
relative manner to allow the exact same rerealization in a different
work environment as long as the same
materialsnippets.txt files are saved in
according folders. Figure 3. From Connector Metadata
ACM Realization Options
Option
Action
thickness
Select a thickness
option used for dimensioning and positioning hexas.
shell gap
Project the hexa spot to touch the shell
elements.
The position is independent from any thickness.
equival. (T1+T2)/2
Create hexa elements with RBE3 elements projecting
and connecting to the surrounding shell
elements.
This realization uses the shell thickness to
calculate the hexa offset from the shell elements.
In the case where the model is a 3T connection, the
acm (equivalenced-(T1+T2)/2) realization will join
the hexa elements. Figure 4.
detached (T1+T2)/2
Create hexa elements with RBE3 elements projecting
and connecting to the surrounding shellstr
elements.
This realization uses the shell thickness to
calculate the hexa offset from the shell elements.
In the case where the model is a 3T connection, the
acm (detached-(T1+T2)/2) realization will not join
the hexa elements. Figure 5.
mid thickness
Calculate the hexa spot size (thickness) as the air
gap between the two connected parts. If there is no
gap, or even a penetration, the hexa spot size will
always be modeled with 1.0.
const thickness
Specify the hexa spot size (thickness).
maintain gaps
Calculate the hexa spot size (thickness) as the gap
distance reduced by two times the specified value
for maintain gaps.
The position is independent from any thickness.
num hexas
Create a hexa cluster
with 1, 4, 8, 12, 16 or 32 hexas, which are arranged in a
predefined pattern. Figure 6.
Note: Available for all ACM realization
types.
coats
Define the number of
hexa elements required along the thickness. Multiple solid coats
are supported.
orthogonal
faces
Force the creation of
perfectly orthogonally-shaped hexas. Figure 7. . The two leftmost realizations were performed with the
orthogonal faces option enabled.
Note: Available for any kind of ACM weld, if num hexas is
set to 1.
