Learning Forum

[Lee]

Background description:

Hi, everyone, I am conducting a FEA simulation on the slipper of piston pump, the bottom surface of this component consists of three annuli, shown in Figure 1, surface 2 is the surface that I want to apply a pressure type load which conforms function p=ln(r2/r) just like what is shown in Figure 3.

In Figure 2,

r2 is outer radius of surface 2,

r1 is inner radius of surface 2

and r1

Questions:

(1) How to realize this load variation on surface 2, I heard that it can be realized by APDL, but this is relatively complicated, so, is there any other simple way to realize this, or the only way to reach the goal is whereby APDL?

(2) If this process must be finished in APDL, any particular book, paper or some relevant reference can be introduced to me?

(3) The simulation is now conducted in module of “static structural”(shown in Figure 4), is this right? Or it needs to be conducted in “transient structural”(shown in Figure 5)?

Best regards!

Excited

[peteroznewman]

Thank you for a completely described question! You can get what you want without resorting to APDL.n#1. Make a Cylindrical Coordinate Systemn#2. Use Excel to make a table of Pressure vs Radius. In the example below, I put a P in front of your equation.n#3. Create a Pressure load using Tabular Data. Set the Independent Variable to X instead of Time. Use the Cylindrical Coordinate System and copy/paste the Excel cells into the Tabular Data field. Just pick the first cell and Paste.nStatic Structural is the right place to build this model. Transient Structural is useful if accelerations are high enough to generate significant inertia forces.n

[Lee]

@Excited Thank you for a completely described question! You can get what you want without resorting to APDL.#1. Make a Cylindrical Coordinate Systemhttps://us.v-cdn.net/6032193/uploads/4M5NHONDEE1N/image.png#2. Use Excel to make a table of Pressure vs Radius. In the example below, I put a P in front of your equation.https://us.v-cdn.net/6032193/uploads/8ID5R2FMN2RP/image.png#3. Create a Pressure load using Tabular Data. Set the Independent Variable to X instead of Time. Use the Cylindrical Coordinate System and copy/paste the Excel cells into the Tabular Data field. Just pick the first cell and Paste.https://us.v-cdn.net/6032193/uploads/GQSH3MP6G797/image.pngStatic Structural is the right place to build this model. Transient Structural is useful if accelerations are high enough to generate significant inertia forces./forum/discussion/comment/101647#Comment_101647

@peteroznewman, Thank you very much for such a kind help, it really makes sense~~n