Viewing Flexible Body Stresses
Here, you will view the stresses on the crankshaft.
To view the stresses on the crankshaft:
1. Open Adams Postprocessor.
2. Switch to Animation mode.
3. Right-click in the blank animation window, and select Load Animation.
Adams Postprocessor displays the model to be animated.
4. Select the Contour Plots tab.
5. From the Contour Plot Type pull-down menu, select Von Mises Stress.
Notice that a legend appears in the window, mapping contour colors to stress values. The default maximum and minimum values of the legend correspond to those for the model displayed for the time frames currently defined in the Animation tab. You can alter the appearance of the legend using the parameters in the bottom of the window.
Because both the shaft and biele components contain stress, they are shaded blue indicating zero stress state for the current (initial) frame.
6. To start the animation, select the Play tool.
The colors on the model map to the colors in the legend, indicating the level of stress at the various points on the model. Note that during the animation, the arm and most of the shaft remain blue due to highly localized stresses in the shaft. The default legend scale is not useful in this case.
7. Pause the animation by selecting the Pause tool.
8. Change the Maximum Value from about 545 to 200 MPa.
9. Play the animation again.
Adams Postprocessor performs the animation, with stress appearing on both the shaft and biele. Note that the color on the biele and shaft is adjusted (from the previous animation) so that the scale is consistent on all parts in the display.
10. Reset your animation.
Now you will animate one component of your model.
To isolate the stresses on the arm (biele):
1. Select the Animation tab.
2. In the Component text box, specify the biele flexible body.
3. In the treeview, select the biele component.
4. In the property editor for the biele, in the Flex Props tab, set the (deformation) Scale to 200.
5. Restart the animation.
Notice that the arm no longer animates in the system. Instead, the display isolates the arm. Also note that the stress contours exhibit mostly a bending stress state in the arm: blue representing zero stress in the middle of the arm and red representing high stress along its edges. This is consistent with the arm’s deformation. Typically, a piston arm inside an engine primarily undergoes axial (compression) stress due to combustion forces. But these forces are not simulated in this model. Only the effects of inertia are being simulated.
6. Stop the animation.