This time, we would like to introduce a series of condition setting procedures of ANSYS Workbench Mechanical
We will introduce a series of condition setting method of ANSYS Workbench Mechanical used in our structural analysis. Structural analysis is divided into five major processes
The process of structural analysis is divided into five major steps, each of which uses different functions.
The process from (1) input of material properties to (4) setting of conditions uses a function called a preprocessor.
Preprocessor" is used for the processes from (1) input of material properties to (4) setting of conditions. This process is used to prepare for the analysis.
The results of (5) are checked using a function called "post processor" to make the results visually easy to understand.
The post-processor function is used to visually check the results. Here, settings for displaying the results after analysis are made.
Let us start with the input of material properties.
(1) Input of material properties
Since this is a linear analysis of steel, the results for stress, deformation, etc. can be obtained by entering the density, Young's modulus, Poisson's ratio
to obtain the calculation results for stress, deformation, etc.
If you want to calculate the factor of safety, you can enter the material's rupture stress and other information at this point.
If you want to consider the plastic region as well, please click here.
(2) Loading analysis model
The 3D model to be analyzed is loaded in STEP or IGES format.
(This is because surface collapse tends to be less common.)
(If the above still results in collapsed surfaces, we also try using the parasolid format (x_t format)).
(3)Mesh setting
Set the appropriate mesh size according to the product shape and size.
In this case, the model is not large (100mm x 100mm) and the shape is not complex, so a mesh size of 2mm was used.
mesh was set at 2mm size. Click here for more information on mesh size setting.
(4)Condition setting
Imagine how the product will actually be used, and set the restraint conditions, load conditions, contact conditions, etc.
In this case, the product is fastened with two bolts, so it can be assumed that it will not move, so the "fixed" condition is set for the bolt contact surface. Assuming that a tensile load is applied to the upper hole via the shaft, a tensile load of 500 N in the Z direction is set to the inside diameter of the hole. Since this is an evaluation of a single product, no contact condition was set.
(5)Confirmation of results
The results of the analysis and the contour plot are displayed to confirm high stress areas, values, etc.
In this contour diagram, low stress areas are displayed in blue and high stress areas in red.
There are various types of stresses, such as equivalent stress and principal stress, but equivalent stress is often used to evaluate the stress applied to a product in a simplified manner. In this case, the tensile strength of the general structural steel is 450 MPa or more, but the maximum stress is 11 MPa, which is equivalent stress, so there is no problem.
(When evaluated by principal stress, the stress may be concentrated in a different location from the equivalent stress.
It is recommended to consider this in both stress evaluations.)
If the generated stress exceeds the material strength, it is necessary to check if the conditions were not set inappropriately.
If there is no problem with the condition setting, then it is necessary to check if the condition setting is appropriate. If there is no problem with the condition setting, the product shape should be reviewed.
In addition to the stress, the overall deformation is also checked to confirm that the design requirements are met.
The above is the sequence of structural analysis.
If the analysis is in the linear region of metal, as in this example, it takes less than a minute to obtain the results.
If the material is resin and you want to see the results in the nonlinear region, the input of material properties and calculation time will differ.
However, as you can see from this sequence of steps
It is difficult for the analyst to notice any flaws in the condition settings until he or she sees the results of the analysis.
If there is a flaw in the condition setting for an analysis that takes one hour of computation time...
You have wasted one hour of computation time.
Therefore, it is necessary to carefully check the conditions before starting the analysis calculation!
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