General Mechanical

General Mechanical

Topics relate to Mechanical Enterprise, Motion, Additive Print and more

Addressing Convergence Challenges in ANSYS Static Structural for Nonlinear Press

    • akshay akshaykulkarniak12
      Subscriber

      I am currently engaged in simulating a quarter-section of a mechanical system involving a press-fit pin and a PCB using the ANSYS Static Structural Solver. Regrettably, I have encountered inaccuracies in the simulation results. Specifically, I am observing excessively high equivalent stress values and unexpectedly low force magnitudes. Furthermore, there are challenges related to the interaction between the pin and the PCB. Secondly, there is gap of 2micrometer between pin eye ball arms, due to the presence of a gap in the pin, I incorporated a frictionless contact condition in that specific region. Unfortunately, the current outcome reveals that, rather than deforming as expected, the pin is sliding along the surface of the PCB's ring.

    • Akshay Maniyar
      Ansys Employee

      Hi Akshay,

      Can you please give more details related to the below points:

      1. Did you use linear or non-linear material?
      2. Is the large deflection option ON?
      3. Did you try switching from frictionless to frictional contact?
      4. Also, share some more details about the loads applied to the model.

      Meanwhile please check the below knowledge material for best practices related to snap fit.

      Snap Fit Analysis - Best Practices - Ansys Knowledge

      Thanks,

      Akshay Maniyar

      • akshay akshaykulkarniak12
        Subscriber

        hey Akshay Maniyar,

        Thanks for your reply,

        Here's a breakdown of the information 

        1. Material Properties: You used non-linear material with creep properties. This indicates that the material behavior in your analysis is non-linear, and it accounts for creep, which is the gradual deformation of a material under a constant load over time.

        2. Large Deflection: The "large deflection" option is ON in your analysis. 

        3. I have tried switching from frictionless to frictional contact. results with greater value of stress.
        4. Load Application: I have applied displacement in five time steps with specific values:

          • Step 1: Displacement = 0.4
          • Step 2: Displacement = 0.8
          • Step 3: Displacement = 1.3
          • Step 4: Displacement = 1.8
          • Step 5: Displacement = 2.3

        Thanks,

        Akshay kulkarni 

    • akshay akshaykulkarniak12
      Subscriber

      hey Akshay Maniyar,

      Thanks for your reply,

      Here's a breakdown of the information 

      1. Material Properties: You used non-linear material with creep properties. This indicates that the material behavior in your analysis is non-linear, and it accounts for creep, which is the gradual deformation of a material under a constant load over time.

      2. Large Deflection: The "large deflection" option is ON in your analysis. 

      3. I have tried switching from frictionless to frictional contact. results with greater value of stress.
      4. Load Application: I have applied displacement in five time steps with specific values:

        • Step 1: Displacement = 0.4
        • Step 2: Displacement = 0.8
        • Step 3: Displacement = 1.3
        • Step 4: Displacement = 1.8
        • Step 5: Displacement = 2.3

      Thanks,

      Akshay kulkarni 

       

    • Akshay Maniyar
      Ansys Employee

      Hi Akshay,

      Can you share the screenshots of boundary conditions? Is it a quarter or half symmetry model?

       

      Thanks,

      Akshay Maniyar

      • akshay akshaykulkarniak12
        Subscriber

        hey akshay ,

        Thanks for your response,

        It's quarter with cyclic symmetry for ring and planner for other parts. 

         

    • Akshay Maniyar
      Ansys Employee

      Hi Akshay,

      As you mentioned your result doesn't look correct, can you check the symmetry conditions and boundary conditions properly? You can insert screenshots how symmetry conditions so that I can check.

      Thanks,

      Akshay Maniyar

      • akshay akshaykulkarniak12
        Subscriber

        Hello, Akshay , here are the screenshots of boundary conditions and symmetry 

         

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