# **Library of Green's functions and its industrial applications**

# **Workshop- Oct. 15 and 16, 1998 (Sponsored by CTCMS, NIST)**

# 

# **Feedback form** (please also use the back of this page and extra sheets if needed)

Name:

Organization:

Brief description of the nature of your technical work:

Please list the aspects of the GF library that you feel would be useful
to your work or that of someone else in your organization:

Please list the strengths and shortcomings of the GF library (criticism
welcome)

In your view, how can the GF library be modified or enhanced to make it
most useful to your organization, and, to the industry in general?

Do you anticipate using the GF library in your organization?

Are you interested in participating in our CTCMS working group either as
a developer or as a user?

Any other suggestions/comments:

Appendix B (contd)

**GF Library workshop: Summary of feedback**

**\*Aspects of GF library useful to your industry**

Fracture mechanics, stress analysis, and thermomechanics problems;
interacting crack- microstructure problems; Interfacial failure.

Optimization of inspection probability of detection of flaws

Fatigue life prediction and lifetime of components

Analysis of engine components with complex geometry.

A generic GF generation utility, GF for different geometries.

Point and click approach to computing.

Storage of Green\'s functions.

Speed- advantages where only the RHS or a small component of the matrix
changes.

Real time computation that enables efficient communication and online
collaboration.

Electronic packaging- solder applications

Training and teaching tool

**Strengths and shortcomings of the GF library**

It accelerates solution of a problem, is CPU efficient, and saves time

Useful for repeated analysis on the same or similar system.

Ease of use through graphics and GUI

Excellent background information available

Very useful Point and click approach

Incomplete documentation

Lack of flexibility to meet specific industry needs.

Needs a lot of storage space.

No discussion of benchmark calculations.

Similar to the idea of static condensation in structural analysis and
FEM

**Suggestions**

Identify areas where BEM is more useful than FEM

More real life 3D examples and applications, as well as optimization
needed

Write a portable open-source BEM tool that would allow LU decomposed
matrix storage.

Better graphical user interface; must be made very fast for large 3D
problems.

Clearly illustrate the particular Green\'s function used in each module.

Detailed discussions should be held about the implementation in
different industries, target end users, cost-benefit analysis etc.

Create a flexible hybrid (hard drive and web based) with a
support/training system.

Better and detailed documentation should be available

Create a consortium for mutual exchange of experiences and ideas.

**Anticipate using the GF library**: Almost everybody said \"yes\"

**Interest in joining the CTCMS working group:** Almost every body said
\"yes\"- as developer as well as user.

**Appendix C**

**Green\'s Function Library Workshop**

**List of attendees -Final**

+----+----------------+-------------------------+---------------------+
|    | **Name**       | **Affiliation**         | **e-mail**          |
+----+----------------+-------------------------+---------------------+
| 1. | Dr. Laocet     | Ball Aerospace          | layari@ball.com     |
|    | Ayari          |                         |                     |
| \* |                |                         |                     |
+----+----------------+-------------------------+---------------------+
| 2. | Prof. John R.  | CSM                     | jberger@mines.edu   |
|    | Berger         |                         |                     |
| \* |                |                         |                     |
+----+----------------+-------------------------+---------------------+
| 3. | Prof. Abhijit  | MTU                     | achandra@mtu.edu    |
|    | Chandra        |                         |                     |
+----+----------------+-------------------------+---------------------+
| 4. | Dr. Joseph     | Allied Signal           | joe.Ch              |
|    | Chao           |                         | ao@alliedsignal.com |
+----+----------------+-------------------------+---------------------+
| 5. | Mr. Michael    | Digital Creators        | mikee@              |
|    | Edlin          | Boulder                 | digitalcreators.com |
+----+----------------+-------------------------+---------------------+
| 6. | Dr. Ivan       | Caterpillar Inc.        | gonsair@cat.com     |
|    | Gonsalves      |                         |                     |
+----+----------------+-------------------------+---------------------+
| 7. | Dr. Steve      | NIST                    | step                |
|    | Langer         |                         | hen.langer@nist.gov |
+----+----------------+-------------------------+---------------------+
| 8. | Prof. Yijun    | Univ. of Cincinnati     | Yijun.Liu@uc.edu    |
|    | Liu            |                         |                     |
+----+----------------+-------------------------+---------------------+
| 9. | Dr. Shan Lu    | ISU                     | shanlu@iastate.edu  |
|    |                |                         |                     |
+----+----------------+-------------------------+---------------------+
| 10 | Dr. Ambar      | ISU                     | akmitra@iastate.edu |
| .  | Mitra          |                         |                     |
+----+----------------+-------------------------+---------------------+
| 11 | Dr. Raj Mohan  | Battelle                | mohanr@battelle.org |
| .  |                |                         |                     |
+----+----------------+-------------------------+---------------------+
| 12 | Mr. S.         | ISU                     | smukund@iastate.edu |
| .  | Mukundan       |                         |                     |
+----+----------------+-------------------------+---------------------+
| 13 | Dr. Adam       | NIST                    | a                   |
| .  | Powell         |                         | dam.powell@nist.gov |
+----+----------------+-------------------------+---------------------+
| 14 | Dr. Lingyun    | Automated Analysis      | panling@aol.com     |
| .  | Pan            | Corporation             |                     |
| \* |                |                         |                     |
+----+----------------+-------------------------+---------------------+
| 15 | Prof. Ravi     | MTU                     | Pandey@mtu.edu      |
| .  | Pandey         |                         |                     |
+----+----------------+-------------------------+---------------------+
| 16 | Dr. S.         | Automated Analysis      | ravi@autoa.com      |
| .  | Raveendra      | Corporation             |                     |
+----+----------------+-------------------------+---------------------+
| 17 | Mr. Mohsen     | SDRC                    | mohs                |
| .  | Rezayat        |                         | en.rezayat@sdrc.com |
+----+----------------+-------------------------+---------------------+
| 18 | Dr. Thomas     | ISU                     | r                   |
| .  | Rudolphi       |                         | udolphi@iastate.edu |
+----+----------------+-------------------------+---------------------+
| 19 | Mr. Bob        | CO School of Mines      | rshepher@mines.edu  |
| .  | Shepherd       |                         |                     |
+----+----------------+-------------------------+---------------------+
| 20 | Dr. Julia      | Univ. of Maryland       | juli                |
| .  | Slutsker       |                         | a1@po1.glue.umd.edu |
+----+----------------+-------------------------+---------------------+
| 21 | Prof. Frank    | ISU                     | friz                |
| .  | Rizzo          |                         | zo@cnde.iastate.edu |
| \* |                |                         |                     |
+----+----------------+-------------------------+---------------------+
| 22 | Dr. Vinod      | NIST                    | tewa                |
| \. | Tewary         |                         | ry@boulder.nist.gov |
| \# |                |                         |                     |
+----+----------------+-------------------------+---------------------+

\* Member, Organizing Committee

\# Chairman, Organizing Committee

Industry (8), Academia (9), NIST (2); PI and collaborators (3); Total 22

**Appendix D**

**Comments by Adam Powell**

(Available on http://www.ctcms.nist.gov/\~powell/green.html)

In its current status the results appear to be

1.State of the art

2.Highly specific

3.Difficult to extend to new problems (except perhaps by the designers
themselves)

In order to improve/broaden the mission of the GF Working Group: \[Note:
I\'ve changed \"Green\'s function library\" to \"Green\'s function
database\" for the following to prevent confusion with \"software
library\". This can be changed back if it is too iconoclastic.\]

1\. A serious effort is needed to identify how a general tool would
work. This means breaking down the separate processes of

i\. Defining a standard format for meshes and LU-decomposed matrices,
and an architecture for the database (heretofore called the \"library\")
to store these matrices (e.g. using CORBA?).

ii\. Building a software library of functions to create matrices\*,
create and read and store their decomposed form in the database, and use
them to solve problems.

iii\. Making a GUI that interfaces to that library.

2\. Thus, there need to be several tools

i\. A database builder

ii\. A database user (calculating engine)

\*The matrix creation part of the library needs to be written in an
extensible/modular form to allow construction of matrices for new types
of problems.

Necessarily the database builder will be for a more sophisticated user
than the database user.