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  1. AlexSK

    High fatigue in the counterbore holes in the FEA

    That's right, the loads are in plane with the plate. This plate is actually a beam on two pivots, that takes high vertical bending loads (~700kN) and horizontal yaw loads (~200kN) generated by the large marine stabiliser. The elastic mounts are engineered to withstand all the loads. The stresses...
  2. AlexSK

    High fatigue in the counterbore holes in the FEA

    Dhengr, I've never seen counterbore holes with sharp spotface fillets in the structural parts and that confuses me a bit. Before posting this I have analysed the structure and keen to trust the results, as different model configurations & setups show similar results. Our company does not have...
  3. AlexSK

    High fatigue in the counterbore holes in the FEA

    I think there might be some other solutions too. I will have a meeting with my manager & manufacturing engineers next week to discuss what we can do with that
  4. AlexSK

    High fatigue in the counterbore holes in the FEA

    Thanks FastMouse! That makes sense now
  5. AlexSK

    Preload and Losses

    My 2 cents. There is difference between tensile yield and permissible bearing stress, or contact pressure, which is your case. Permissible bearing strength is typically 1.5 of the material tensile strength. You can find bearing stress for different materials in the engineering handbooks
  6. AlexSK

    High fatigue in the counterbore holes in the FEA

    Hello all, I was reading eng-tips for serveral years and it helped me to find solutions for many problems. Now I have a problem with fatigue in the counterbore holes in the FEA, so I will be happy to hear your comments about it. I am analysing 6061-t6 aluminium frame with the heavy loaded bolted...

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