NESC0611 CHILES

CHILES, Singularity Strength of Linear Elastic Bodies by Finite Elements Method

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 AUTHORS, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: CHILES

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2. COMPUTERS

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Program name	Package id	Status	Status date
CHILES	NESC0611/01	Tested	25-MAY-1981
CHILES	NESC0611/02	Tested	01-MAY-1981

Machines used:

Package ID	Orig. computer	Test computer
NESC0611/01	CDC 7600	CDC 7600
NESC0611/02	CDC 7600	IBM 370/168

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3. DESCRIPTION OF PROBLEM OR FUNCTION

CHILES  is a  finite  element
computer program that calculates the  strength of singularities in
linear   elastic  bodies.    Plane  stress,   plane  strain,   and
axisymmetric  conditions  are  treated.    Crack  tip  singularity
problems are solved by  this version of the code, but  any type of
integrable  singularity  may  be  properly  modeled  by  modifying
selected subroutines in the program.

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4. METHOD OF SOLUTION

A generalized,  quadrilateral finite  element
that includes a singular point at a corner node is incorporated in
the code.  The displacement formulation  is used and inter-element
compatibility  is  maintained  so  that  monotone  convergence  is
preserved.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

CHILES allows
three singular points to be modeled in the body being analyzed and
each singular point may have coupled Mode I and II deformations.
1000 nodal points may be used.

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6. TYPICAL RUNNING TIME

Less than 2 minutes is required for a
typical problem.

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7. UNUSUAL FEATURES OF THE PROGRAM

A pre-created mesh may be read
from an external file and computed results are written on an
external file for plotting.

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8. RELATED AND AUXILIARY PROGRAMS:

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9. STATUS

Package ID	Status date	Status
NESC0611/01	25-MAY-1981	Tested at NEADB
NESC0611/02	01-MAY-1981	Tested at NEADB

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10. REFERENCES

- S.E. Benzley:
  Representation of Singularities with Isoparametric Finite
  Elements
  International Journal for Numerical Methods in Engineering,
  (to be published).

NESC0611/01, included references:

- S.E. Benzley and Z.E. Beisinger:
  CHILES - A Finite Element Computer Program that Calculates the
  Intensities of Linear Elastic Singularities
  SLA-73-0894 (September 1973).

NESC0611/02, included references:

- S.E. Benzley and Z.E. Beisinger:
  CHILES - A Finite Element Computer Program that Calculates the
  Intensities of Linear Elastic Singularities
  SLA-73-0894 (September 1973).

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11. MACHINE REQUIREMENTS:

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NESC0611/01	FORTRAN-IV
NESC0611/02	FORTRAN-IV

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED: SCOPE 3.3.

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

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15. NAME AND ESTABLISHMENT OF AUTHORS

                 S. E. Benzley and Z. E. Beisinger
                 Analytical Development Division 1541
                 Sandia Laboratories
                 P. O. Box 5800
                 Albuquerque, New Mexico  87115

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16. MATERIAL AVAILABLE

NESC0611/01

File name	File description	Records
NESC0611_01.001	SOURCE	1693
NESC0611_01.002	S.P. INPUT	218
NESC0611_01.003	S.P. OUTPUT	987

NESC0611/02

File name	File description	Records
NESC0611_02.002	INFORMATION FILE	7
NESC0611_02.003	JCL	22
NESC0611_02.004	SOURCE FORTRAN	1710
NESC0611_02.005	S.P. INPUT	218
NESC0611_02.006	S.P. OUTPUT	987

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17. CATEGORIES

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

Keywords: elasticity, finite element method, fracture properties, numerical solution, solids, strains, stresses, two-dimensional.