AFRL-MN-EG-TP-2006-7411 A Study of Composite Strengthening Through Application of an Electric Field Robert L. Sierakowski Air Force Research Laboratory Munitions Directorate AFRL/MN CA-N Eglin AFB, FL 32542-6810 Igor Y. Telichev Olesya I. Zhupanska REEF University of Florida Shalimar, FL 32579 September 2006 CONFERENCE PAPER PREPRINT This paper has been submitted to the American Society of Mechanical Engineers to be presented at the 2006 ASME International Mechanical Engineering Congress & Exposition, Chicago, IL, November 5-10, 2006. One of the authors is a U.S. Government employee working within the scope of his/her position; therefore, the U.S. Government is joint owner of the work. If published, ASME may assert copyright. If so, the U.S. Government has the right to copy, distribute, and use the work by or on behalf of the U.S. Government. Any other form of use is subject to copyright restrictions. This paper is published in the interest of the scientific and technical information exchange. Publication of this paper does not constitute approval or disapproval of the ideas or findings. DISTRIBUTION A: Approved for public release; distribution unlimited. Approval Confirmation #AAC/PA 08-25-06-404. AIR FORCE RESEARCH LABORATORY, MUNITIONS DIRECTORATE Air Force Materiel Command United States Air Force Eglin Air Force Base
REPORT DOCUMENTATION PAGE Form Approved OMB No. 0704-0188 Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. 1. REPORT DATE (DD-MM-YYYY) XX-08-2006 2. REPORT TYPE Conference Paper Preprint 3. DATES COVERED (From - To) 1977-2006 4. TITLE AND SUBTITLE A Study of Composite Strengthening Through Application5a. CONTRACT NUMBER of an Electric Field (PREPRINT) 6. AUTHOR(S) Robert L. Sierakowski - AFRL/MN Igor Y. Telichev - REEF Olesya I. Zhupanska - REEF 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER 5d. PROJECT NUMBER 5e. TASK NUMBER 5f. WORK UNIT NUMBER 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 8. PERFORMING ORGANIZATION REPORT NUMBER Air Force Research Laboratory Munitions Directorate AFRL/MN CA-N Eglin AFB, FL 32542-6810 REEF University of Florida Shalimar, FL 32579 AFRL-MN-EG-TP-2006-7411 9. SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR S ACRONYM(S) Air Force Research Laboratory Munitions Directorate AFRL/MN CA-N Eglin AFB, FL 32542-6810 12. DISTRIBUTION / AVAILABILITY STATEMENT DISTRIBUTION A: Approved for public release; distribution unlimited. Approval Confirmation #AAC/PA 08-25-06-404. AFRL-MN-EG 11. SPONSOR/MONITOR S REPORT NUMBER(S) Same as Block 8 13. SUPPLEMENTARY NOTES This paper has been submitted to the American Society of Mechanical Engineers to be presented at the 2006 ASME International Mechanical Engineering Congress & Exposition, Chicago, IL, November 5-10, 2006. One of the authors is a U.S. Government employee working within the scope of his/her position; therefore, the U.S. Government is joint owner of the work. If published, ASME may assert copyright. If so, the U.S. Government has the right to copy, distribute, and use the work by or on behalf of the U.S. Government. Any other form of use is subject to copyright restrictions. 14. ABSTRACT This paper studies effects of an electric field on the mechanical response of unidirectional carbon fiber polymer matrix composites. The existing experimental evidence suggests that exposure of a composite material to the electromagnetic field leads to changes in the material s strength and resistance to delamination. We have analyzed the effects promoting this phenomenon: coupling of mechanical and electromagnetic fields and Joule heat effects and develop an experimental setup for impact tests of the composites carrying an electric current. Experimental results of low velocity impact tests on unidirectional carbon fiber polymer composite plates carrying a DC electric current show that electrified composites fail at higher impact load. Moreover, a larger electric field leads to a larger impact load that may be sustained by the composite. Finally, analysis of the Joule heat effects reveals that it is not a primary mechanism for the strengthening phenomenon observed in the experiments. 15. SUBJECT TERMS Polymer Matrix Composites, DC Electric Current, Joule Heating, Low Velocity Impact. 16. SECURITY CLASSIFICATION OF: 17. LIMITATION OF ABSTRACT a. REPORT Unclassified b. ABSTRACT Unclassified c. THIS PAGE Unclassified SAR 18. NUMBER OF PAGES 19a. NAME OF RESPONSIBLE PERSON Dr. Robert L. Sierakowski 12 19b. TELEPHONE NUMBER (include area code) Standard Form 298 (Rev. 8-98) Prescribed by ANSI Std. Z39.18