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  1. otaviobarodrigues

    Singularities appear only when beam/pipe is inclined – PIPE31 element

    I have adopted a encastre on top and the nodes with numerical singularity are located in the middle of the tube.
  2. otaviobarodrigues

    Singularities appear only when beam/pipe is inclined – PIPE31 element

    Here is the .inp file.
  3. otaviobarodrigues

    Singularities appear only when beam/pipe is inclined – PIPE31 element

    Hi everyone, I'm modeling a 3D beam using PIPE31 elements to represent a pipe (defined with Beam Section). The beam is fully fixed at the top (all 6 DOFs), and there is no contact in the model — just a single beam structure with self-weight. When the pipe is vertical, the simulation runs...
  4. otaviobarodrigues

    Pipe pressure load with analytical field and hydrostatic pressure

    I checked out. The pressures and analytical fields, both are taking into account because we have section forces. The main problem is due to an analytical field simulating a hydrostatic pressure and the final results are different.
  5. otaviobarodrigues

    Pipe pressure load with analytical field and hydrostatic pressure

    Hello, I am simulating the internal and external pressures in a tube. For this purpose, in my simulation, I am using the PIPE31 element and a loading type called PIPE PRESSURE. In this type of loading, it is possible to define a distribution using an analytical field and specify a mathematical...
  6. otaviobarodrigues

    ABAQUS pipe-in-pipe contact with friction

    Hello, everyone. I am currently modeling a pipe-in-pipe system using ABAQUS. In my setup, the outer pipe is fixed, while the inner pipe is deformable and undergoes buckling. For contact interactions, I have applied general/hard contact, enabling simulations with automatic stabilization. A...
  7. otaviobarodrigues

    Dynamic implicit quasi-static analysis in ABAQUS

    Hi, I am running a simulation in ABAQUS of the helical buckling of concentric tubes. Initially, I was conducting a static analysis with automatic stabilization. Due to the high nonlinearity, I opted for a quasi-static implicit dynamic analysis. Therefore, Abaqus requires defining the material...
  8. otaviobarodrigues

    Buckling analysis in ABAQUS

    Hello, everyone. I'm modeling the contact between two concentric tubes in ABAQUS. The inner tube is elastic, while the outer one is rigid. I used PIPE31 and ITT31 elements. The inner tube is under buckling. First, I obtain the buckling modes to introduce the imperfections in the structure...
  9. otaviobarodrigues

    Convergence issue in simulation with buckling and contact in Abaqus

    I am attempting to simulate the buckling problem of two concentric tubes in Abaqus, with the larger diameter tube being rigid. To simulate contact, I have used the following conditions: - general contact, all with self, type edge to edge, radial direction The post-buckling analysis is...
  10. otaviobarodrigues

    ABAQUS, tube to tube contact

    Hello, everyone. I'm trying to model the contact between two concentric tubes in ABAQUS. The inner tube is elastic, while the outer one is rigid. I used PIPE31 and ITT31 elements, created a rigid surface for the outer tube, and applied hard contact. However, the model does not converge, and...

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