Allen, Phillip A.

Wells, Doug

NASA Technical Reports Server

Damage Tolerance Assessment Branch 
MSFC Engineering Directorate 
1 
ASTM Committee Meeting 
E08.07.03 Surface Cracks  
 
E2899 Business 
 
May 6, 2014 
Doug Wells & Phillip Allen 
NASA MSFC 
Damage Tolerance Assessment Branch 
https://ntrs.nasa.gov/search.jsp?R=20140010984 2019-08-31T19:29:07+00:00Z
Damage Tolerance Assessment Branch 
MSFC Engineering Directorate 
2 
Agenda 
A.  Approval of the minutes from November 2013 meeting in Jacksonville, 
FL 
B.  Old Business 
•  Official release of E2899 
•  Analytical round robin phase II kickoff 
 
C.  New Business 
•  Proposed changes for E2899 
•  Analytical round robin phase II update 
•  Tool for Analysis of Surface Cracks (TASC) update 
Damage Tolerance Assessment Branch 
MSFC Engineering Directorate 
3 
E2899 Release 
E2899 Release 
 
•  The new surface crack standard, 
E2899, was officially released by 
ASTM in October 2013 and is now 
available for download from the 
website. 
•  Will be discussing proposed changes 
at this meeting. 
Damage Tolerance Assessment Branch 
MSFC Engineering Directorate 
4 
E2899 Proposed Changes 
Change to elliptical shape requirements 
 
Damage Tolerance Assessment Branch 
MSFC Engineering Directorate 
5 
E2899 Proposed Changes 
Change to EPFM regime description 
 
Damage Tolerance Assessment Branch 
MSFC Engineering Directorate 
6 
E2899 Proposed Changes 
Editorial changes 
 
Damage Tolerance Assessment Branch 
MSFC Engineering Directorate 
7 
Objectives: 
1)  Determine the consistency in the interpretation of the test 
evaluation requirements in E2899.    
2)  Provide additional information on the analytical 
consistency of finite element (FE) methods as prescribed 
in the standard for future revision of the precision and bias 
statements.  An evaluation of interpolated solutions as an 
alternative to FE will also be requested through use of the 
recently developed TASC. 
 
 
Analytical Round Robin Phase II 
To Participate or Ask Questions: 
Please email us: 
Douglas.N.Wells@nasa.gov 
Phillip.A.Allen@nasa.gov 
Damage Tolerance Assessment Branch 
MSFC Engineering Directorate 
8 
RR Phase II based on 4142 steel SC(T) test  
Analytical Round Robin Phase II 
1.75 
(44.45) 
18.00 
(457.2) 
5.00 
(127.0) 
2.504 
(63.60) 
R2.23 
(R56.6) 
4.50 
(114.3) 
0.499 
(12.67) 
5.00 
(127.0) 
2.63 
(66.8) 
Damage Tolerance Assessment Branch 
MSFC Engineering Directorate 
9 
Current participants 
•  Enrico Lucon – NIST 
•  Greg Thorwald – Quest Integrity Group 
•  Jason Bely – Alcoa 
•  Steven Altstadt – Stress Engineering Services 
•  Michael Windisch – MT Aerospace 
•  Ryan Sherman – Purdue University 
•   Francisco Martin – Purdue University 
•  Dawn Phillips – NASA MSFC 
Analytical Round Robin Phase II 
Damage Tolerance Assessment Branch 
MSFC Engineering Directorate 
10 
TASC Update 
•  TASC (Tool for Analysis of Surface 
Cracks) is a computer program 
created by NASA MSFC that 
enables easy computation of three-
dimensional, nonlinear J-integral 
(fracture energy) solutions for 
surface cracked plates in tension. 
What is TASC? 
Test specimen 
fracture surface 
Damage Tolerance Assessment Branch 
MSFC Engineering Directorate 
TASC Accessibility 
•  A TASC project page is hosted on Sourceforge.net at: 
https://sourceforge.net/projects/tascnasa/ 
•  TASC can be freely downloaded in Windows® 64-bit standalone executable, Mac OS X® 64-
bit standalone application, and MATLAB source file formats. 
•  No MATLAB license is required for the standalone executable versions license due to the 
royalty-free MATLAB Complier Runtime distribution provided with the program installation 
package, and no MATLAB experience is needed due to the simple GUI. 
•  TASC is released under the NASA Open Source Agreement Version 1.3. 
•  TASC was posted on Sourceforge on Jan. 28, 2014 and to date has had over 300 downloads 
•  TASC’s background documentation: 
  Allen, P.A. and Wells, D.N., Interpolation Methodology for Elastic-Plastic J-Integral Solutions for 
Surface Cracked Plates in Tension, Engineering Fracture Mechanics 119, 2014, pp 173-201. 
  Allen, P.A. and Wells, D.N., Applications of Automation Methods for Nonlinear Fracture Test 
Analysis, ASTM STP1571 on Sixth Symposium on Application of Automation Technology in Fatigue 
and Fracture Testing and Analysis, Accepted for publication Nov. 2013. 
  Allen PA, Wells DN. Elastic-Plastic J-Integral Solutions for Surface Cracks in Tension Using an 
Interpolation Methodology. NASA MSFC; 2013. NASA/TM-2013-217480. 


ASTM Committee Meeting E08.07.03 Surface Cracks - E2899 Business

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