Learning Forum

[peteroznewman]

Array nYou can build an ANSYS model to plot the length of the shaft vs the Reaction Torque.nIn the description, the length of the shaft is called thickness. A washer has a thickness and an OD and an ID.nYour problem says the target stiffness is 280 Nm/rad while the applied torque is 100 Nm. By simple division, you can compute the rotation of one end of the shaft is 100/280 radians = 20.463 degrees relative to the other fixed end.nYou don't need ANSYS to solve this problem, you could do it with a hand calculation. Look up the equations for torsion on a shaft.nIf you want to use ANSYS anyway, Open DesignModeler and draw a line along the X axis where the length of the line is marked as an input parameter. The line body is given a tube cross-section with the specified OD and ID. In a Static Structural model, a material is created with the Young's Modulus. One end of the line body has a fixed support. The other end has a remote displacement. In the remote displacement, you can set the Y and Z displacements to 0 and set the rotation about X to 20.462 degrees.nIn Mechanical, under the Solution branch, insert a Probe, Reaction Moment and select the Remote Displacement. The reaction moment about X is marked as an output parameter. Under Analysis Settings, turn on Large Deflection.nIn the Parametric set, provide a range of lengths on the rows of the Design Points Table. Click Update All Design Points. Ansys will go out and solve the model for each row of the table with the provided input length and fill in the output moment.nPlot that data. If your table doesn't have values of moment that cross 100, you will know if you need new rows that are longer or shorter lengths. Interpolate the length between the two values in the table that cross the 100 Nm value. That is the length that satisfies the requirements.nThe video in this discussion shows the process.n nYou can build an ANSYS model to plot the length of the shaft vs the Reaction Torque.nIn the description, the length of the shaft is called thickness. A washer has a thickness and an OD and an ID.nYour problem says the target stiffness is 280 Nm/rad while the applied torque is 100 Nm. By simple division, you can compute the rotation of one end of the shaft is 100/280 radians = 20.463 degrees relative to the other fixed end.nYou don't need ANSYS to solve this problem, you could do it with a hand calculation. Look up the equations for torsion on a shaft.nIf you want to use ANSYS anyway, Open DesignModeler and draw a line along the X axis where the length of the line is marked as an input parameter. The line body is given a tube cross-section with the specified OD and ID. In a Static Structural model, a material is created with the Young's Modulus. One end of the line body has a fixed support. The other end has a remote displacement. In the remote displacement, you can set the Y and Z displacements to 0 and set the rotation about X to 20.462 degrees.nIn Mechanical, under the Solution branch, insert a Probe, Reaction Moment and select the Remote Displacement. The reaction moment about X is marked as an output parameter. Under Analysis Settings, turn on Large Deflection.nIn the Parametric set, provide a range of lengths on the rows of the Design Points Table. Click Update All Design Points. Ansys will go out and solve the model for each row of the table with the provided input length and fill in the output moment.nPlot that data. If your table doesn't have values of moment that cross 100, you will know if you need new rows that are longer or shorter lengths. Interpolate the length between the two values in the table that cross the 100 Nm value. That is the length that satisfies the requirements.nThe video in this discussion shows the process.nGood luck!n