ESTS0329 ORMGEN3D.

1. NAME OR DESIGNATION OF PROGRAM:  ORMGEN3D, 3-d crack geometries mesh generator.

3. DESCRIPTION OF PROGRAM OR FUNCTION

ORMGEN3D is a finite element mesh generator for computational fracture mechanics analysis. The program automatically generates a three-dimensional finite element model for six different crack geometries. These geometries include flat plates with straight or curved surface cracks and cylinders with part-through cracks on the outer or inner surface. Mathematical or user-defined crack shapes may be considered. The curved cracks may be semicircular, semielliptical, or user-defined. A cladding option is available that allows for either an embedded or penetrating crack in the clad material.

4. METHOD OF SOLUTION

In general, one eighth or one-quarter of the structure is modelled depending on the configuration or option selected. The program generates a core of special wedge or collapsed prism elements at the crack front to introduce the appropriate stress singularity at the crack tip. The remainder of the structure  is modelled with conventional 20-node isoparametric brick elements.  Element group I of the finite element model consists of an inner core of special crack tip elements surrounding the crack front enclosed by a single layer of conventional brick elements. Eight element divisions are used in a plane orthogonal to the crack front, while the number of element divisions along the arc length of the crack front is user-specified. The remaining conventional brick elements of the model constitute element group II.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:  Maxima of:
5,500 nodes, 4 layers of clad elements

6. TYPICAL RUNNING TIME

NESC executed all six sample problems in 2.2  CP seconds on a Cray Y-MP/832.

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS

ORMGEN3D is part of a three- program system, ORMGEN-ADINA-ORVIRT, which addresses linear or nonlinear fracture in two -or three dimensional crack geometries. ORMGEN3D creates data flow of nodal point coordinates, element connectivities, displacement, and pressure boundary conditions for input to the ADINA structural analysis program. ORVIRT functions as  a postprocessor to ADINA and employs a virtual crack extension technique to compute energy release rates at specified positions along the crack front.

10. REFERENCES

- B.R. Bass and J.W. Bryson, Applications of Energy Release Rate
  Techniques to Part-Through Cracks in Plates and Cylinders,
  Volume  1. ORMGEN-3D: A Finite Element Mesh Generator for
  3-Dimensional  Crack Geometries, NUREG/CR-2997 Volume 1
  (ORNL/TM-8527/VI),  December 1982, with User Instruction Updates
  (Version 3.0),  September 23, 1988.
_ ORMGEN3D, NESC No. 11348, ORMGEN3D Tape Description and Sample
  Problem Output, National Energy Software Center Note 92-16,
  October 17, 1991.
- B.R. Bass and J.W. Bryson, Applications of energy Release Rate
  Techniques to Part-Through Cracks in Plates and Cylinders,
  Volume  2. ORVIRT: A Finite Element Program for Energy Release
  Rate  Calculations for 2-Dimensional and 3-Dimensional Crack
Models, NUREG/CR-2997 Volume 2 (ORNL/TM-8527/V2), February 1983. - K.J. Bathe, ADINA - A Finite Element Program for Automatic Dynamic   Incremental Nonlinear Analysis, Massachusetts Institute of
  Technology report 82448-1, 1975, revised 1978.

- B.R. Bass and J.W. Bryson:
  Applications of Energy Release Rate Techniques to Part-Through
  Cracks in Plates and Cylinders
  Volume 1. ORMGEN-3D: A Finite Element Mesh Generator for
  3-Dimensional Crack Geometries
  NUREG/CR-2997 Volume 1 (ORNL/TM-8527/VI), (December 1982).
- L. Eyberger:
  ORMGEN3D, NESC No. 11348, ORMGEN3D Tape Description and Sample
  Problem Output
  NESC Note 92-16 (October 17, 1991).

11. MACHINE REQUIREMENTS

ORMGEN3D requires 263,000 words of memory for execution on a Cray Y-MP/832.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  UNICOS 5.1.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

     B.R. Bass and J.W. Bryson
     Oak Ridge National Laboratory

File name	File description	Records
ESTS0329_01.001	Information file	61
ESTS0329_01.002	JCL and control information	16
ESTS0329_01.003	ORMGEN3D FORTRAN source	2950
ESTS0329_01.004	Sample problem input 1	10
ESTS0329_01.005	Sample problem input 2	9
ESTS0329_01.006	Sample problem input 3	9
ESTS0329_01.007	Sample problem input 4	9
ESTS0329_01.008	Sample problem input 5	8
ESTS0329_01.009	Sample problem input 6	8
ESTS0329_01.010	Sample problem output 1	107
ESTS0329_01.011	Sample problem output 2	85
ESTS0329_01.012	Sample problem output 3	107
ESTS0329_01.013	Sample problem output 4	120
ESTS0329_01.014	Sample problem output 5	82
ESTS0329_01.015	Sample problem output 6	82
ESTS0329_01.016	Logfile sample problem 1	12
ESTS0329_01.017	Logfile sample problem 2	12
ESTS0329_01.018	Logfile sample problem 3	12
ESTS0329_01.019	Logfile sample problem 4	12
ESTS0329_01.020	Logfile sample problem 5	12
ESTS0329_01.021	Logfile sample problem 6	11