Computer Programs
NESC0650 ELBOW
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NESC0650 ELBOW

ELBOW, Stress Analysis, Flexibility Factors for Curved Pipes with Internal Pressure

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1. NAME OR DESIGNATION OF PROGRAM:  ELBOW
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2. COMPUTERS
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Program name Package id Status Status date
ELBOW NESC0650/01 Tested 01-SEP-1977

Machines used:

Package ID Orig. computer Test computer
NESC0650/01 IBM 370 series IBM 370 series
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3. DESCRIPTION OF PROBLEM OR FUNCTION

ELBOW calculates the stresses, stress indices, and flexibility factors for in-plane and out-of-plane bending of elbows and curved pipe subjected to internal pressure. Comparison with experiments indicates that the results accurately represent the maximum stresses which occur at the center of the bend.
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4. METHOD OF SOLUTION

Results are obtained using a trigonometric series solution, which is a modified version of the method of Rodabaugh and George to include a correction for transverse compression recommended by Gross.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The program does not account for the effects of end restraint or out-of-roundness. Since end-effects are not included, the calculated stresses and flexibility of the elbow may be larger than the actual values.
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6. TYPICAL RUNNING TIME

Approximately 15 seconds are required to execute the sample problem.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS:
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9. STATUS
Package ID Status date Status
NESC0650/01 01-SEP-1977 Tested at NEADB
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10. REFERENCES

- W.G.Dodge and S.E. Moore:
ELBOW - A FORTRAN Program for the Calculation of Stresses, Stress
  Indices and Flexibility Factors for Elbows and Curved Pipe, ORNL-TM-4098 (April 1973).
- W.G. Dodge and S.E. Moore:
Stress Indices and Flexibility Factors for Moment Loadings on Elbows and Curved Pipe ORNL-TM-3658 (March 1972).
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11. MACHINE REQUIREMENTS:  80K bytes of core storage
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0650/01 FORTRAN+ASSEMBLER
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:   OS/360.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHOR

                 W. G. Dodge
                 Oak Ridge National Laboratory
                 P. O. Box X
                 Oak Ridge, Tennessee  37830
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16. MATERIAL AVAILABLE
NESC0650/01
File name File description Records
NESC0650_01.001 ELBOW SOURCE PROGRAM - F4 EBCDIC 551
NESC0650_01.002 ELBOW SOURCE - ASSEMBLER 156
NESC0650_01.003 ELBOW SAMPLE PROBLEM INPUT DATA 3
NESC0650_01.004 ELBOW SAMPLE PROBLEM PRINTED OUTPUT 201
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17. CATEGORIES
  • I. Deformation and Stress Distributions, Structural Analysis and Engineering Design Studies

Keywords: bending, flexibility, pipes, stresses.