Dear All,
I modeled a rotating blade in the Abaqus/CAE 6.14-2 x64. The blade is generated using the properties of different sections of the airfoils along the span. The generalized beam section is used for different sections of the blade. The mass of the blade is given as a longitudinal mass in line with its length. The material used for blade has an elastic modulus of 13.1 GPa, and a shear modulus of 8 GPa. The properties of this generalized section consisted of the area (A), the moment of inertia along two axes (I11, I22), and polar moment of inertia (J). Element type B31 was used to meshing the blade.
The blade was then spun by the Displacement/Rotation boundary condition of Abaqus around an axis through one end perpendicular to its length. The rotation was modeled in both Static-General and Dynamic-Explicit methods. In both cases, there was a significant increase in the length of the blade.
How to prevent the elongation of the generalized beam section in the Abaqus? It is noted that the natural frequencies of the blade should not change. For example, the amount of elastic modulus should not be increased.
Sincerely,
Hi Mohsen Mehr Motlagh
Perhaps if you designate an extremely high elastic modulus in the axial direction to check the model? If excessive elongation is still evident then perhaps there might be some flaw in the boundary condition settings. And check the values as well, not just the visualisation.
Hope it helps.
Regards,
Will
Dear Wee Khor,
Thanks for your suggestion. I will try orthotropic material for the blade.
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