Pipe stress analysis - Y piece

Discussion in 'CAE & CÁC PHẦN MỀM MÔ PHỎNG' started by progiangbk, Jul 26, 2012.

  1. Duc Dinh

    Duc Dinh New Member

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    Các phần mềm như AutoPIPE hay CAESAR II dùng để phân tích toàn cục (global) giả sử các fittings là đủ bền để phân tích ứng suất và tính vẹn toàn của đường ống (pipeline, piping). Sau khi chạy bằng các phần mềm này xong sẽ xuất ra nội lực tại các mặt cắt của fittings, rồi dùng các phần mềm phần tử hữu hạn như Ansys, Abaqus,... phân tích local theo các tiêu chuẩn ASME,...
     
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  2. umy

    umy Well-Known Member

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    Thí dụ dùng Ansys Shell element Type, Tính cục bộ local Y Piece:.
    - Phải biết đưa điều kiện biên hợp lý.
    .- Áp suất nén trong Ống phải cân bằng, mới có đúng kết quả

    https://www.studioalicino.it/en/page/special-y-piece-power-plant
    Special Y piece for power plant

    Model of the special Y piece
    [​IMG]

    Stress maps of several load cases
    [​IMG]
     
  3. umy

    umy Well-Known Member

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    Thí dụ FEA hệ thống Ống trong thực tiển:

    Phân tích tổng thể (System), với Pipe element type

    https://pveng.com/home/pipe-stress-analysis/screenshots-of-pipe-stress-analysis-in-action/
    [​IMG]
    A pipe rack with elevated risers and expansion loops. Red pipe in the middle is the full system. Top and bottom pipes in blue are details. Motions are shown below.


    [​IMG]
    Motion of pipes in the pipe rack with elevated risers. Attention is paid to optimizing the design of the loop while keeping motions and loads in the rest of the system within limits.


    [​IMG]
    A tower with a guided flexible pipe connection. The guided connection allows the flexibility required in the nozzle while limiting the loads applied to the vessel nozzle. Modelling the flexibility of the nozzle and accounting for the different possible temperatures of the piping system and tower is required for successful analysis.


    [​IMG]
    Stress analysis of a pump skid from storage towers to dual pumps. The temperature distribution of the piping varies depending on which pump or pumps are running. Here the pipes leading to the operating pump are hotter than the standby pipes. Multiple load cases are required to ensure the piping design is acceptable.


    [​IMG]
    Pipe stress analysis of the fictional but artistic piping system shown on our homepage.


    Xem thêm
    sau đó cục bộ (local) theo các tiêu chuẩn ASME,...


    https://pveng.com/home/fea-stress-analysis/finite-element-analysis-in-action-post/

    https://pveng.com/home/pipe-stress-analysis/pipe-stress-analysis-sample-report/
    [​IMG]
    FEA Stress Analysis


    Finite Element Analysis (FEA) can calculate pressure, thermal and seismic stress and cycle life for complex designs outside of standard code rules.


    [​IMG]
    Displacement of the bend under pressure magnified 2000x.

    Displacement is calculated first. Here the displaced shape has been magnified 2000x. It can be seen from the top view that under pressure the legs separate. The diameter also grows, but not from the centerline. The displaced shape is complex enough that the analyst cannot easily predict it. From this it is expected that the stress pattern will also be complex.

    [​IMG]
    Stress plot with area of excess stress shown. The design fails.
     

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