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Pre-Processing for Pipes Impact using RADIOSS Block - RD-3520
For this tutorial it is recommended that you complete the introductory tutorial, Getting Started with HyperMesh - HM-1000. Working knowledge of the creation and editing of collectors and card images are a definite pre-requisite. Familiarity with the interfaces panel, and the creation of boundary conditions are useful, although not required.
Objective
In this tutorial you will learn how to set up a RADIOSS input file in HyperMesh for analyzing the impact response between two pipes. The modeling steps that are covered are:
Model Description
The units used in this tutorial are milliseconds, millimeters and kilograms (ms, mm, kg), and the tutorial is based on RADIOSS Block 51.
Pipe model Exercise
Step 1: Load the RADIOSS Block User Profile and import the model
In the following steps, load the RADIOSS Block User Profile, then import a RADIOSS input deck containing the mesh for the two pipes.
Selecting the RADIOSS User Profile sets the FE input reader to RADIOSS Block and loads the
RADIOSS51 FE output template. It also loads a RADIOSS macro menu with numerous tools specific to this interface. The graphical user interface is tailored to RADIOSS users with panels such as the admas panel on the 1D page, panel names and options renamed or removed to match RADIOSS terminology.
The model is loaded and is organized into two component collectors: 1 and 2 (named by HyperMesh). No materials or properties are defined at this time.
•
Creating materials, sections, and parts for the model.•
Defining the contact between the two pipes using /INTER/TYPE7.•
Applying a translational initial velocity to a pipe using the /INIVEL card.•
Applying local constraints to the other pipe using the /BCS card.
1.Load the Radioss Block User Profile using the pull down menu Preferences > User Profile > RADIOSS
(Block Format) > BLOCK90 ....
2.From the files panel, select the import subpanel and import the following RADIOSS deck:
Notes:On import of a RADIOSS deck, any HyperMesh warning and error messages are written to a file
On import, any RADIOSS cards not supported by HyperMesh are written to the control card
unsupp_cards . This card is accessed from the control cards panel on the BCs page and is a
pop-up text editor. The unsupported cards are exported with the rest of the model.
Care should be taken if an unsupported card points to an entity in HyperMesh. An example of this is an unsupported material referenced by a /PART card. HyperMesh stores unsupported cards as text and does not consider pointers.
On import, HyperMesh renumbers entities having the same ID as other entities. In HyperMesh, for example, all elements must have a unique ID. The message file radiossblk.msg provides a list of renumbered elements and their original and new IDs.
Step 2: Understand the relationships between the /PART, /SHELL, /MAT and /PROP cards in HyperMesh
A /PART shares attributes such as section properties (/PROP) and a material model (/MAT). A group of shells (/SHELL) sharing common attributes generally share a common part ID (PID).
The figure below shows how these keywords are mapped to HyperMesh entities:
Map to HyperMesh entities Component, property and material collectors are created and edited from the collectors panel.
For the RADIOSS keyword interface, there is only one component card image and it is named Part . There are several property card images, such as P1_shell P2_truss , P14_solid . There are many material card images, such as M1_ELAST , M48_HONEYCOMB .
The complete list of card images is available from the collectors panel, as you assign card images to the various types of collectors.
A HyperMesh card image allows you to view the image of keywords and data lines for defined RADIOSS entities as interpreted by the loaded template. The keywords and data lines appear in the exported RADIOSS input file as you see them in the card images. Additionally, for some card images, you can define and edit various parameters and data items for the corresponding RADIOSS Block.
Use the card (card editor) panel from the permanent menu to review and edit card images. Also, for many entities, their card image can be viewed and edited from the panels in which they are created.
Step 3: Create a /MAT card In HyperMesh, a /MAT card is associated to a material collector. To relate it to a /PART card, the material collector needs to be assigned to a component collector.
You can assign the material to the component collector as you create the component using the create
subpanel of the collectors panel. In situations where the material was not assigned to the component at the time of creation (and in this case, a dummy material is created with the same name as the component
named radiossblk.msg . This file is created in the folder from which HyperMesh is started. The content of the file is also displayed in a pop-up window.
/SHELL elem_ID part_ID
> Organized into component collectors
/PART part_ID prop_ID mat_ID > Component collector with a component
card image
/PROP prop_ID > Property collector with a property card
image
/MAT mat_ID
>
Material collector with a material card
image
