AE4131 ABAQUS Lecture Part V. Patrick Roberts [email protected] x5-2773 Weber 201. Starting ABAQUS CAE. You can start ABAQUS CAE from the start menu or with a command line by typing abaqus cae
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AE4131ABAQUS LecturePart V
You can start ABAQUS CAE from the start menu or with a command line by typing abaqus cae
TIP: You should start ABAQUS CAE via command line from the directory you want your results files to end up.
Example: Let’s look at a 3D beam that has dimensions of 1m length, 0.1 m height, and 0.2 m width.
Under the General procedure type there are two basic types of dynamic analysis; implicit and explicit.
ABAQUS/Explicit offers fewer element types than ABAQUS/Standard. For example, only first-order, displacement method elements (4-node quadrilaterals, 8-node bricks, etc.) and modified second-order elements are used, and each degree of freedom in the model must have mass or rotary inertia associated with it. However, the method provided in ABAQUS/Explicit has some important advantages:
For our modeling we will use ABAQUS Standard (implicit).
We apply a 5 Newton load to the top two corners of the beam at the free end.
The model may take some time to run. You should monitor the model as it runs. If there is a problem it’s important you see how the problem manifests itself.
What we see is an initial transient region then the oscillation settles to a steady state with a bias from 0 of about 0.65. Because there is no damping the energy cannot dissipate so it will oscillate about this point at that amplitude forever. Numerical errors can often appear as “artificial” damping (usually negative damping which causes exponential growth)
In our example we consider a block bonded onto a plate. There is a circular area in the center that is not bonded. We want to model how this non-bonded area effects the dynamic response of the block when there is a periodic pressure load applied on the bottom of the plate.
(From the ABAQUS documentation)
These are constants that are defined on the data lines of *AMPLITUDE
(From the ABAQUS documentation)
Go to Tools, Amplitude, Create, give it a name and choose Periodic. Add the values as seen in the next slide.
When choosing which parts mesh controls, element type, seed and mesh instance hold down the Shift key and choose both parts.
ABAQUS helps you locate problems by assigning nodes or elements to sets so you can view them in the Visualization module.
Turn on Node labeling
Create a Display group. When you choose Node Sets you will see a list of sets the system created when it had problems. Pick one and you will see they are near the perimeter of the circle we created.
All attributes of a node are defined by the elements that are attached to them. The nodes along the perimeter of the circle are connected to elements with two different contact surface definitions. Therefore, ABAQUS doesn’t know which rule set to apply to these nodes.
This model takes quite some time to run. The important item to notice is no more warnings. The results should be compared with theory.