NESC0657 LINDA

LINDA, Diagnostics of Stress Analysis of Linear Elastic Structure by Least Square Fit

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROBLEM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: LINDA

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2. COMPUTERS

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Program name	Package id	Status	Status date
LINDA	NESC0657/01	Tested	01-JUN-1978

Machines used:

Package ID	Orig. computer	Test computer
NESC0657/01	IBM 360 series	IBM 360 series

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3. DESCRIPTION OF PROBLEM OR FUNCTION

LINDA implements a diagnostic
procedure   which  depends   upon  the   hypothesis  that   strain
measurements obtained from a linear elastic structural test should
be proportional to the applied  loads.  Nonlinearities in the data
from such a test are expected to arise from errors in measuring or
recording  either  the  strains  or  the  loads.   The  diagnostic
procedure provides a means to identify and distinguish between the
two types of errors.

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4. METHOD OF SOLUTION

The algorithm for evaluating strain-gage data
obtained from  linear elastic  tests is  based upon  the use  of a
series of least-square fits.  Data are subjected to three distinct
tests:  the  linearity test,  the variability  test,  and a  load-
adjustment test.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The code is
currently dimensioned to handle data from 400 strain rosettes and
9 load steps.

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6. TYPICAL RUNNING TIME

Approximately 30 seconds of CPU time are
required to run the sample problem.

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7. UNUSUAL FEATURES OF THE PROGRAM

The program makes some use of
object-time formatting.

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8. RELATED AND AUXILIARY PROGRAMS:

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9. STATUS

Package ID	Status date	Status
NESC0657/01	01-JUN-1978	Tested at NEADB

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10. REFERENCES

NESC0657/01, included references:

- W.G. Dodge & J.E. Smith
A Diagnostic Procedure for the Evaluation of Strain Data from a
Linear Elastic Test
ORNL-TM-3415, November 1972.

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11. MACHINE REQUIREMENTS: 180K bytes of core storage are required for
execution.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NESC0657/01	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

   The
two Assembly  language routines  included in  the package  are the
ORNL environment routines IDAY, a  date procedure, and ICOMPARE, a
routine to compare n-characters of two character strings.

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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

NESC0657/01

File name	File description	Records
NESC0657_01.001	SOURCE PROGRAM (F4)	886
NESC0657_01.002	SOURCE PROGRAM (ASSEMBLER)	103
NESC0657_01.003	SAMPLE PROBLEM INPUT DATA	407
NESC0657_01.004	SAMPLE PROBLEM PRINTED OUTPUT	2165

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17. CATEGORIES

I. Deformation and Stress Distributions, Structural Analysis and Engineering Design Studies

Keywords: elasticity, errors, materials testing, pipes, resolution, strains, stress analysis.