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General Mechanical

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Buckling analysis of initially curved strut and eccentrically loaded strut

    • josef.xerri.21
      Subscriber

      I'm trying to perform an analysis of an initially curved strut and an eccentrically loaded strut.

      For the initially curved strut (fixed-pinned), I placed a moment (1Nmm) in load step 1 and a force (-1N) acting downwards in load step 2. This resulted in a load multiplier of 80.762 which is different than the buckling of an axially loaded fixed-pinned strut. Due to the different multiplier I'm inclined to believe that this analysis is what im looking for but I'm not sure.

      For the case of an eccentrically loaded strut, I used the same boundary conditions, however I placed a force (-1N) using the vertex selection to simulate the eccentricity. This also resulted a load multiplier of 80.762.

    • Gaurav Sharma
      Ansys Employee

      Is Large Deflection used in these analyses. If not, please turn on the large deflection effects to better capture the updating stiffness.

      The eccentricity in the loading is primarily expected to impact the load multiplier regardless of whether this eccentricity is caused by an imperfect geometry of an offset in load. It seems, the two conditions (initially curved strut and eccentric loading) used here are such that the end impact on stiffness remains the same.

      This can be verified by comparing the stress and deformation plots. If these plots are similar between the two conditions, the stiffness of the two models as calculated by the Ansys solver would also be similar and the results of the follow-on eigenvalue buckling analysis should also be similar.  

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