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1. REPORT DATE (DD-MM-YYYY) 2. REPORT TYPE 

Interim Research Performance Report (Monthly) 

3. DATES COVERED (From - To) 

June 1 - June 30, 2013 

4. TITLE AND SUBTITLE 

Expeditionary Light Armor Seeding Development 

5a. CONTRACT NUMBER 

5b. GRANT NUMBER 

N00014-13-1-0219 

5c. PROGRAM ELEMENT NUMBER 

6. AUTHOR(S) 

Shridhar Yarlagadda, Bazle Haque 

5d. PROJECT NUMBER 

5e. TASK NUMBER 

5f. WORK UNIT NUMBER 

7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 

UNIVERSITY OF DELAWARE 

OFFICE OF THE VICE PROVOST FOR RESEARCH 

220 HULLIHEN HALL 

NEWARK, DE 19716-0099 

8. PERFORMING ORGANIZATION REPORT 
NUMBER 

MONTHLY-3 

9. SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) 

Office of Naval Research 

875 North Randolph Street 

Arlington, VA 22203-1995 

10. SPONSORyMONITOR’S ACRONYM(S) 

ONR 

11. SPONSORyMONITOR’S REPORT 
NUMBER(S) 

12. DISTRIBUTION / AVAILABILITY STATEMENT 

Approved for Public Release; distribution is Unlimited. 

13. SUPPLEMENTARY NOTES 

14. ABSTRACT 


Previous 2D AutoDyn mesh sensitivity analyses of cylinder impact on ceramic determined the 0.20-mm mesh size provides a 
fracture pattern that may be considered acceptable 

Previous mesh sensitivity analyses used a constant erosion strain value of 1.0 for the projectile and 2.0 for the target 
Using the accepted 0.20-mm mesh size, analysis has been conducted to determine the effect of erosion strain on target 
fracture patterns and projectile kinetic energies 

Erosion strain sensitivity analysis is performed using three different geometric strain values for both the target and projectile, 
totaling 9 different models 

We will explore the effect of plastic strain erosion in further AutoDyn analyses 


15. SUBJECT TERMS 


2D AutoDyn modeling, cylinder impact, conico-cylinder impact, fracture pattern, mesh sensitivity, erosion strain 


16. SECURITY CLASSIFICATION OF: 

UU 

17. LIMITATION 

OF ABSTRACT 

18. NUMBER 
OF PAGES 

19a. NAME OF RESPONSIBLE PERSON 
Shridhar Yarlagadda 

a. REPORT 

b. ABSTRACT 

c. THIS PAGE 

uu 

18 

19b. TELEPHONE NUMBER (include area 
code) 

302-831-4941 


Standard Form 298 (Rev. 8-98) 
Prescribed by ANSI Std. Z39.18 


ac V 15 





































MONTHLY REPORT 
JUNE 2013 

MODELING AND SIMULATION OF CERAMIC 
ARRAYS TO IMPROVE BALLAISTIC 
PERFORMANCE 


2013 © University of Delaware 




Monthly Report for June 2013 



□ Previous 2D AutoDyn mesh sensitivity analyses of 
cylinder impact on ceramic determined the 0.20-mm mesh 
size provides a fracture pattern that may be considered 
acceptable 

□ Previous mesh sensitivity analyses used a constant 
erosion strain value of 1.0 for the projectile and 2.0 for the 
target 

□ Using the accepted 0.20-mm mesh size, analysis has been 
conducted to determine the effect of erosion strain on 
target fracture patterns and projectile kinetic energies 

□ Erosion strain sensitivity analysis is performed using 
three different geometric strain values for both the target 
and projectile, totaling 9 different models 

□ We will explore the effect of plastic strain erosion in 
further AutoDyn analyses 


2013 © University of Delaware 




Axi-Symmetric Model Geometry 



22.86-mm 15.00-mm 


2013 © University of Delaware 












Erosion Parameters Examined 



NOMENCLATURE 

GS- Geometric 
Strain Erosion 

PS - Plastic Strain 
Erosion 

T - Target 

P - Projectile 



This case is represented by PS-P-1-T-1 


2013 © University of Delaware 

































Fracture Pattern T-0.5, t = 0.040-ms 




Conclusion: P-2 fracture does not agree with other two cases 


2013 © University of Delaware 










Fracture Pattern T-1, t = 0.040-ms 



Conclusion: Target has similar fracture for all cases 


2013 © University of Delaware 





Fracture Pattern T-2, t = 0.040-ms 



Conclusion: Target has similar fracture for all cases 


2013 © University of Delaware 





Fracture Pattern P-0.5, t = 0.040-ms 




GS-P-0.5-T-0.5 


GS-P-0.5-T-1 


GS-P-0.5-T-2 


Conclusion: T-0.5 fracture does not agree with other two cases 


2013 © University of Delaware 






Fracture Pattern P-1, t = 0.040-ms 




GS-P-1-T-0.5 


GS-P-1-T-1 


GS-P-1-T-2 


Conclusion: T-0.5 fracture does not agree with other two cases 


2013 © University of Delaware 













Fracture Pattern P-2, t = 0.040-ms 



GS-P-2-T-0.5 



GS-P-2-T-1 




GS-P-2-T-2 


Conclusion: T-0.5 fracture does not agree with other two cases 


2013 © University of Delaware 






Projectile KE, kJ. 


Energy Profile: P-0.5 



o I------- 1 -----■-*-'—■—■—■—•— 1 

0 0.01 0.02 0.03 0.04 0.05 


Time, ms. 


2013 © University of Delaware 































Projectile KE, kJ. 


Energy Profile: P-1 




0 I---.—.— -----*---*-*-*-*-*-*-*-•-*-*-*-*-■— 1 

0 0.01 0.02 0.03 0.04 0.05 


Time, ms. 


2013 © University of Delaware 

































Energy Profile: P-2 



0.02 0.03 0.04 0 . 

Time, ms. 


0.01 


2013 © University of Delaware 


































Energy Profile: T-0.5 




0 1 —*— 1 —*— 1 — 1 —*—*—‘—‘— 1 —*—*—*—*— 1 —*— 1 —*— 1 — 1 — 1 —*—*— 1 — 

0 0.01 0.02 0.03 0.04 0.05 


Time, ms. 


2013 © University of Delaware 
































Projectile KE, kJ. 


Energy Profile: T-1 




0.02 0.03 

Time, ms. 


0.04 


0.05 


0.01 


2013 © University of Delaware 









































Energy Profile: T-2 




2013 © University of Delaware 






























Fracture Pattern GS vs. PS 




GS-P-1-T-1 


PS-P-1-T-1 


GS-P-2-T-2 


PS-P-2-T-2 


2013 © University of Delaware 




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CANCELLATION NOTICE IS RECEIVED. 

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CHARGE. HOWEVER, IF THE CHANGE IS MADE LESS THAN FOURTEEN (14) DAYS IN 
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