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ROHR2FESU

Finite Element Analysis of Substructures in ROHR2

 

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ROHR2FESU is an additional module in the program system ROHR2 for detailed analysis of local segments in pipes and vessels.

ROHR2fesu offers the easy-to-use modeling of sub-structures by nearly any circle and elliptic geometry using shell elements , fully integrated in the ROHR2 framework. This enables to carry out detailed analysis of critical segments inside the framework of the entire model. The shell element sub-structure analysis is carried out using FE-method.

The mesh generator of ROHR2FESU automatically integrates intersections of branches, trunions, and nozzles with and without reinforcement. ROHR2FESU allows controlling the mesh resolution in a simple way.
ROHR2fesu has been verified extensively by comparison against reference solutions of standard problems.

April 2010: 3R International Magazine
Circular Attachments according to EN 3480-3 Clause 11 Compared to FEM-Analysis. read more
 

ROHR2fesu offers:

  • Complete integration of the FE structure(s) into the connecting framework
  • easy-to-use parameter controlled model generation and meshing
  • short calculation time
  • automatic stress analysis and documentation
ROHR2FESU links

 

 

 

 

Introduction

Modeling of the Framework

Integration in ROHR2

ROHR2FESU Examples

Complex Systems

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FESU_100506_2_220

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Simplified Model in ROHR2FESU

ROHR2FESU Model

Shell model shown in ROHR2FESU

    The main focus of the application of ROHR2FESU is problems in piping and vessel models where stiffness and/or stress analysis needs to be performed like for:

  • Intersections of piping elements generally,
  • Special components for which internal pressure design stress codes are available but no calculation norms for external forces and moments
  • Components where the standards of k- and i-factors are unsatisfactory
  • Special components without k- and i-factors defined in the stress codes
  • Analysis of local stress utilization, e.g. for life-time analysis
  • Optimization of details in pipe and vessel constructions
  • Nozzle and cams at vessel with or without reinforcement
  • Big diameter tubes with miter bends
  • Calculations with to measured pipe segments (as-built) , e.g. bends
  • Damage analysis at corroded or eroded pipes
  • Detail analysis of bend deformation due to internal pressure or bending in oval bends
    Of course the standard pipe components (e.g. acc. to EN 13480) can be modeled and calculated in ROHR2FESU.
     

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Superelements, available in ROHR2FESU

  • Cone, centric, eccentric, or elliptical
  • Cylinder (conus special shape)
  • Pipe bend as Ideal sound bend, miter bend or measured bend
  • Torus, convex or concave
  • Spherical slice or ellipsoid slice

    •  

ROHR2FESU is available as an additional program to the ROHR2 single user license and to the ROHR2 network license.
The system requirements correspond to those of the program ROHR2. Running ROHR2FESU always requires the installation of ROHR2.

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ROHR2fesu Release note, March 2010

ROHR2, optional program ROHR2 module for FE-analysis has been released. ROHR2fesu is running under ROHR2 31.0 or higher.
ROHR2fesu replaces the program ROHR2fem. The task of ROHR2fesu is the detailed analysis of any circular and elliptical geometries by means of shell models. ROHR2fesu is not a stand-alone application but integrated into the ROHR2 program environment.

The current program version is ROHR2 30.3c, released August 2009 and updated continuously by online updates.
Until market launch of ROHR2 31.0 (expected in 1st half of 2010) the delivery of ROHR2fesu is equipped by a ROHR2 31.0 pre-release.
The delivery of ROHR2 31.0 is planned until summer 2010.
There will be the opportunity to upgrade from ROHR2fem to ROHR2fesu.
Integration into ROHR2

ROHR2FESU is fully integrated into the ROHR2WIN user interface.

Select the segment, to be analyzed detailed, in the framework. From framework details (geometry, dimensions, com-ponent type like bend or head) a coarse model of the sub-structure is generated from the selected segment. This model can be completed in ROHR2FESU by details which are missing in the framework. The sub-structure is shown in the containing piping framework using the system lines or as simple shell model. By a double-click on the sub-structure in the framework, ROHR2FESU is launched to change the model or for analysis or documentation of the sub-structure.

The assignment of operation data (pressure, temperature, medium density) at each load case in the framework is done analogue to the ROHR2win framework.
 

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ROHR2 calculation of the connecting framework
The stiffness of sub-structure is considered in the framework by a stiffness matrix resulting form the FE-analysis.

ROHR2FESU calculation of the substructure
Loads at the connection points in the framework are automatically taken over into the calculation of the sub-structure.
Loads from the sub-structure are taken over in the framework analysis.

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