Welcome to this Ansys How to Series Video for Granta EduPack. In this video, we will
be focusing on the Limit Stage, which allows us to put in constraints, such as minimum
and maximum values for properties. This step enables us to further narrow down our candidate
materials during a materials selection. For this tutorial, we will use the introductory
Level 1 database. Click the chart/select function in the main toolbar. In Selection Stages,
we have the options to create a Chart, set a Limit or filter using a Tree stage. For
now, we will focus on the Limit feature. By clicking on Limit , a new tab opens within
the software. Three buttons are at the top of the page, settings, apply, and clear. A
list of properties are displayed underneath. Additional information about this stage and
other aspects of the software can be accessed through the online help here and Video tutorials
here Note that in the limit stage, we can find three types of attribute. Numeric attributes
use numeric limits such as minimum, maximum, or range values. Discrete attributes enable
us to select discreet values from a list. More than one value may be selected. Logical
attributes are attributes which accept true or false data. Let's explore how each of these
attributes are displayed within the limit stage. Take a look at the mechanical properties
by clicking on the header. The mechanical properties from the material records for this
database are displayed here. For more information on a specific property, for example Fracture
toughness, we can open the relevant Science Note by clicking on the name. The bar chart
icon here displays the typical values of the property for different classes of material.
Hovering over a bar shows the exact range. The x-axis label gives descriptions for materials
at the extrema. Materials with low fracture toughness are brittle while materials with
high fracture toughness are tough. To set a limit for this numerical attribute, we simply
type the minimum and maximum acceptable values in these boxes. For our example, let s choose
materials with a fracture toughness greater than 10. We will enter our minimum value here
to remove any material with a value below our limit. Press apply to apply the limit.
The materials which pass this selection stage are displayed in the Results window in the
left-hand selection project panel. We can see 20 out of 69 materials passed our constraint
of a fracture toughness higher than 10 MPa/m^2. If we want to apply additional limits, we
can either create a new limit stage, or we can enter additional constraints in this stage.
Let's add other limits in the same stage. The price of a material is often a consideration
during design. Price is found under general properties. For example, we want to identify
materials that cost less than 5 dollars per kg by entering a maximum limit. This removes
any materials with a price above 5 dollars per kg. In this limit example, our design
could also require a high degree of thermal conductivity. In Thermal Properties, select
Good conductor from the drop down menu next to the discrete attribute Thermal conductor
or insulator? . We may want a material which is also recyclable. Under Eco Properties we
can select the logical attribute Recycle by clicking the tick box. Now, we have chosen
4 limits to refine the selection of our records. Applying these additional constraints, we
can see the updated result list, in the Results window. We now have 9 candidate materials
based on our constraints. In this How To video, we have covered how to use the Limit stage
to put constraints on our dataset of interest within Granta EduPack. Links to tutorials on how to create and format
charts, as well as how to use the Tree stage to further narrow down a materials selection
project can be found in the description below. Links to additional resources for Granta EduPack
and other Ansys software can also be found in the description. Be sure to check out our
channel for other Ansys Learning videos and Thank you for watching!