Shridhar Yarlagadda assistant director of research Research Professor, Electrical & Computer Engineering
204 Composites Manufacturing Science Laboratory University of Delaware | Newark, DE 19716-3144 Phone: (302) 831-4941 Fax: (302) 831-8525 Email: yarlagad@ccm.udel.edu

Research Interests: Multifunctional Composite Structures – Design, Processing and Integration, Innovative Manufacturing, and Repair Technologies

Education

Ph.D., Aerospace Engineering, Penn State University, 1999
M.S., Aerospace Engineering, Penn State
B.Tech. Aerospace Engineering, IIT Madras, India

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PATENTS

Vaidyanathan, K.R., S. Yarlagadda, C. Green, G. J. Artz, J. W. Gillespie Jr., “Composite Components with Integral Protective Casings,” patent disclosure filed November 12, 2002 (Case No. 03248.00063).

Gerhard, Jack, K., E. J. Lynam, M.R. Shaffer, S. Yarlagadda, N. B. Shevchenko, B. K. Fink, D. Heider, J.J. Tierney, J.W. Gillespie Jr., “Apparatus for Induction Lamination of Electrically Conductive Fiber-Reinforced Thermoplastic,” patent application filed, January 2001.

Wetzel, E. D., B. K. Fink, Y. F. Li, J. Xiao, S. Yarlagadda, and J. W. Gillespie Jr., “Magnetically Semi-Hard Ceramics for Curie-Temperature-Controlled Induction Heating,” invention disclosure filed, March 2001.

Vaidyanathan, R., M. Fox, M. J. Rigali, A. C. Mulligan, J. W. Gillespie Jr., S. Yarlagadda, and M. R. Effinger, “Ceramic Composite Advanced Tow Placement (CCATP) Process: A Rapid Prototyping Technique for Continuous-Fiber-Reinforced Ceramic-Matrix Composites,” patent application filed, July 2000.

Fink, B. K., J. W. Gillespie Jr., and S. Yarlagadda “Tailored Mesh Susceptors for Uniform Induction Heating, Curing, and Bonding of Method of Materials,” U. S. Patent No. 6043469, issued March 28, 2000.

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Recent Journal PUBLICATIONS

Mahdi, S., H-J Kim, B. A. Gama, S. Yarlagadda, and J. W. Gillespie, Jr., ”A Comparison of Oven-Cured and Induction-Cured Adhesively Bonded Composite Joints,” Journal of Composite Materials, Vol. 37, No. 6, March 2003.

Mahdi, S., B. A. Gama, S. Yarlagadda, and J. W. Gillespie, Jr., “Effect of the Manufacturing Process on the Interfacial Properties and Structural Performance of Multifunctional Composite Structures,” Composites Part A: Applied Science and Manufacturing, (in press, April 2003).

Kim, H-J, S. Yarlagadda, N. B. Shevchenko, B. K. Fink, and J. W. Gillespie, “Development of a Numerical Model to Predict In-plane Heat Generation Patterns during Induction Processing of Carbon Fiber Reinforced Prepreg Stacks,” Journal of Composite Materials, (accepted January 2003).

Yarlagadda, S., H-J. Kim, J. W. Gillespie, Jr., N. B. Shevchenko, B. F. Fink, “A Study on the Induction Heating of Conductive Fiber Reinforced Composites,” Journal of Composite Materials, Vol. 36, No. 4, pp. 401-421, 2002.

Kim H-J., S. Yarlagadda, J. W. Gillespie, N. B. Shevchenko, B. K. Fink, "A Study on the Induction Heating of Carbon Fiber Reinforced Thermoplastic Composites," Advanced Composite Materials, Vol. 11, No. 1, pp. 71-80, March 2002.
ACCEPTED

Suwanwatana, W., S. Yarlagadda, and J. W. Gillespie, Jr., “An Investigation of Oxidation Effects on Hysteresis Heating of Nickel Particles,” Journal of Material Science, (accepted August 2002).

Tay, T. E., S. Yarlagadda, J. W. Gillespie Jr., B. K. Fink, and S. H. McKnight, “Accelerated Curing of Adhesives in Bonded Joints by Induction Heating,” Journal of Composite Materials, Vol. 33, No. 17, pp. 1643–1664, 1999.

1998 and before

Yarlagadda, S., J. W. Gillespie Jr., and B. K. Fink, “Resistive Susceptor Design for Uniform Heating During Induction Bonding of Composites,” Journal of Thermoplastic Composite Materials, Vol. 11 No. 4, pp. 321–337, July 1998.

Lesieutre, G.A., Yarlagadda, S., Christiansen, D. and Whatley, W., Publications: "Enhanced Composite Plate Damping using Intercalated Graphite Fiber," AIAA Journal, Vol. 31, No. 4, 1993, p. 746-750

Yarlagadda, S. and Lesieutre, G.A., "Fiber Contribution to Modal Damping of Polymer Matrix Composites," Journal of Spacecraft and Rockets, Vol. 32, No. 5, p. 825-831.

Lesieutre, G.A., Yarlagadda, S., Yoshikawa, S., Kurtz, S.K. and Xu, Q.C., "Passively Damped Structural Composite Materials Using Resistively Shunted Piezoceramic Fibers," Journal of Materials Engineering and Performance, Vol. 2(6), Dec. 1993, p. 887-892.

Yarlagadda, S., Chan, M.H.W., Lee, H., Lesieutre, G.A., Jensen, D.J., Messer, S.R. "Low Temperature Thermal Conductivity, Heat Capacity and Heat Generation of PZT," Journal of Intelligent Material Systems and Structures, Vol. 6, No. 6, Nov. 1995, pp. 757-764.

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CONFERENCE PROCEEDINGS

Vaidyanathan, R., J. Campbell, G. Artz, S. Yarlagadda, J. W. Gillespie, Jr., D. Dunaj, B. Guest, and K. L. Nesmith, “A Water Soluble Tooling Material for Complex Polymer Composite Components and Honeycombs,” (submitted SAMPE 2003, Long Beach).

Vaidyanathan, R., C. Green, T. Phillips, S. Yarlagadda, J. W. Gillespie, Jr. and M. Effinger, “Automated Tow Placement of Continuous Fiber Reinforced Ceramic Composites,” to be submitted SAMPE 2003, Advancing Materials in the Global Economy: Applications, Emerging Markets and Evolving Technologies, Long Beach Convention Center, Long Beach, CA, May 11-15. 2003 (submitted July 2002).

Gama, B. A., S. Mahdi, C. Chicanhowski, S. Yarlagadda, and J. W. Gillespie, Jr., ‘Static and Dynamic Behavior of Scarf Repaired Thick Section Composite Parts,” ASTM Symposium on Joining and Repair of Composites,” Kansas City, MO, March 17-18, 2003 (to be submitted July 2002).

Kim, H-J, S. Yarlagadda, B. K. Fink, and J. W. Gillespie, Jr., “Through-Thickness Heating Behavior of Carbon Fiber Reinforced Prepeg Stacks in Induction Heating Process,” 34th International SAMPE Technical Conference, Baltimore, MD, November 4-7, 2002 (submitted July 2002).

Suwanwatana, W., S. Yarlagadda, and J. W. Gillespie, Jr., Induction Bonding of Composite Materials Using Nickel/Polysulfone Films,” 34th International SAMPE Technical Conference, Baltimore, MD, November 4-7, 2002 (submitted July 2002).

R. Vaidyanathan, C. Green, L. Brack, R. Cipriani, S. Yarlagadda, J. Gillespie, Jr., M. Effinger, K. Cooper, “Solid Freeform Fabrication of Continuous Fiber Reinforced C/ZrC and C/SiC Ceramic Matrix Composites”, 26th Annual International Conference on Advanced Ceramics & Composites, Cocoa Beach, FL, January 2002.

Kim H. J., S. Yarlagadda, J. W. Gillespie, Jr., N. B. Shevchenko, B. K. Fink, “Induction-Based Processing of Thermoplastic Carbon Fiber Laminates – A Numerical Study of Heat Generation of AS4/PEI Prepreg Stacks,” International Conference for Manufacturing of Advanced Composites, Belfast, Northern Ireland, September 27-28, 2001.

Gama, B. A., S. Yarlagadda, T. A. Bogetti, B. K. Fink, and J. W. Gillespie Jr., “Repair of Composite Integral Armor,” Proceedings of the 46th International SAMPE Symposium, vol. 46, pp. 1174-1184, SAMPE, Long Beach Convention Center, Long Beach, CA, May 6-10, 2001.

Lombardi, J. L., G. Artz, R. Vaidyanathan, S. Yarlagadda, J. W. Gillespie, Jr., "A Water Soluble Mandrel Material for Fabricating Complex Polymer Composite Components," Proceedings of the 46th International SAMPE Symposium, vol. 46, pp. 1316-1319, SAMPE, Long Beach, CA. May 6-10, 2001.

Vaidyanathan, R., J. Walish, M. Fox, M. Rigali, R. Cipriani, S. Yarlagadda, J. W. Gillespie, Jr., and M. Effinger, "Solid Freeform Fabrication of Continuous Fiber Reinforced Composites for Propulsion Applications," presented at the 25th Annual Conference on Composites, Materials and Structures Restricted Sessions, Cape Canaveral/Cocoa Beach, FL, January 22-25, 2001.

Lombardi, J. L., G. J. Artz, R. Vaidyanathan S. Yarlagadda, and J. W. Gillespie Jr., “A Water Soluble Mandrel Material for Fabricating Complex Polymer Composite Components,” 45th International SAMPE Exhibition and Symposium, Long Beach, CA, May 6-9, 2001.

Yarlagadda, S., D. Heider, J. Tierney, J. W. Gillespie Jr, N. B. Shevchenko, and B. K. Fink, “Rapid Automated Induction Lamination (RAIL) of Carbon/Thermoplastics: Process Optimization and Prove-Out,” Proceedings of the 22nd International SAMPE Europe Conference, La Defense, Paris, France, March 27–29, 2001, pp. 193-206.

Yarlagadda, S., D. Heider, J. Tierney, J. W. Gillespie Jr, N. Shevchenko, B. K. Fink, J. Gerhard, E. Lynam, K. Beck, and H. Laudern, “Rapid Automated Induction Lamination (RAIL) of Carbon/Thermoplastics: Factory Implementation and Prove-Out,” Proceedings of 46th International SAMPE Symposium, vol. 46, pp. 886 – 897, SAMPE, Long Beach, CA, May 6–9, 2001.

Sands, J. M., T. A. Bogetti, B. K. Fink, S. Yarlagadda, B. Gama, and J. W. Gillespie, Jr., “Induction-Assisted Repair of Multi-Functional Composite Armor,” 5th DoD Composites Repair Workshop, Coeur d’Alene, ID, November 13-16, 2000.

Vaidyanathan, R., J. Walish, M. Fox, M. Rigali, R. Cipriani, S. Yarlagadda, J. W. Gillespie, Jr., and M. Effinger, "Solid Freeform Fabrication of Continuous Fiber Reinforced Composites for Propulsion Applications," presented at the 4th Conference on Aerospace Materials, Processes, and Environmental Technology (AMPET, Huntsville, AL), September 18-20, 2000.

Yarlagadda, S., D. Heider, J. J. Tierney, J. W. Gillespie Jr., N. Shevchenko, and B. K. Fink, “Rapid Automated Induction Lamination (RAIL) for High-Volume Production of Carbon/Thermoplastic Laminates,” submitted to Midwest Advanced Materials and Processing Conference/SAMPE-DOE-SPE Advanced Composites Conference & Exposition, Dearborn, MI, September 12-14, 2000.

Yarlagadda, S., H-J. Kim, J. W. Gillespie Jr., N. Shevchencko, and B. K. Fink, “Heating Mechanisms in Induction Processing of Carbon Fiber Reinforced Thermoplastic Prepreg,” Proceedings of SAMPE 2000, 45th International SAMPE Symposium and Exhibition, Long Beach, CA, May 2000, pp. 79-89.

Kim, H-J., S. Yarlagadda, J. W. Gillespie Jr., D. Heider, N. Shevchencko, and B. K. Fink, “A Numerical Study on the In-plane Heating Patterns of Carbon Fiber Reinforced Composites,” to be published in Proceedings of the Ninth US-Japan Conference on Composite Materials, Mishima, Shizuoka, Japan, July 3–4, 2000, pp. 117-124.

Yarlagadda, S., H-J. Kim, N. Shevchenko, B. K. Fink, and J. W. Gillespie Jr., “Heating Mechanisms in Induction Processing of Carbon Thermoplastic Prepreg,” Proceedings of SAMPE 2000, May 21–25, 2000, Long Beach, CA.1999.

McKnight, S. H., S. Yarlagadda, B. K. Fink, and J. W. Gillespie Jr., “Magnetic Particle-Based Adhesive Systems for Composite Repair,” ANTEC 99, New York, NY, May 2–6, 1999.

Fink, B. K., S. H. McKnight, J. W. Gillespie Jr., and S. Yarlagadda, “Ferromagnetic Nano-Particulate and Conductive Mesh Susceptors for Induction-Based Repair of Composites,” Proceedings of the 21st Army Science Conference: Science and Technology for Army After Next, Norfolk, VA, June 15–17, 1998.

Firko, J., S. Yarlagadda, B. K. Fink, and J. W. Gillespie Jr., “Optimization of Heat Generation in Induction Bonding Using Metal Mesh Susceptors,” Proceedings of the American Society for Composites Thirteenth Technical Conference (CD-ROM), pp. 468–480, A. J. Vizzini, ed., published by American Society for Composites, Los Angeles, CA, and distributed by Composites Research Laboratory, University of Maryland, College Park, MD, 1998.

Tay, T. E., S. Yarlagadda, B. K. Fink, and S. H. McKnight, J. W. Gillespie Jr., S. Wells, “Application of Induction Heating to Accelerate Curing of Adhesives in Bonded Joints,” Proceedings of the American Society for Composites 13th Technical Conference (CD-ROM), pp. 605–618, A. J. Vizzini, ed., published by American Society for Composites, Los Angeles, CA, and distributed by Composites Research Laboratory, University of Maryland, College Park, MD, 1998.

McKnight, S. H., B. K. Fink, S. Wells, S. Yarlagadda, and J. W. Gillespie Jr., “Accelerated Curing of Epoxy Paste Adhesives for Repair of Composites Using Induction Heating,” Proceedings of ANTEC 98, Society of Plastics Engineers, Brookfield, CT.

Yarlagadda, S., J. W. Gillespie Jr., and B. K. Fink, “Electromagnetic Fusion Bonding of Thermoplastic Composites Using Optimized Mesh Susceptors,” Proceedings of the Materials Research Society Meeting, Boston, December 1997.

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REPORTS

Vaidyanathan, R., C. Green, J. Stevenson, B. Nave, G. Artz, S. Yarlagadda, J. W. Gillespie, Jr., “Design and Fabrication of Low-Cost Composite Tooling Materials,” Technical Report November 2001.

Shevchenko, N., B. K. Fink, S. Yarlagadda, J. J. Tierney, D. Heider, J. W. Gillespie, Jr., “Rapid Automated Induction Lamination (RAIL) for High-Volume Production of Carbon/Thermoplastic Laminates,” Army Research Lab Technical Report, ARL-TR-2478, May 2001.

Fink, B. K., S. H. McKnight, S. Yarlagadda, and J. W. Gillespie Jr., “Non-Polluting Composites Repair and Remanufacturing for Military Applications: Induction-Based Repair of Integral Armor,” Army Research Laboratory Technical Report, ARL-TR-2121, November 1999.

Tay, T. E., S. Yarlagadda, J. W. Gillespie Jr., B. K. Fink, and S. H. McKnight, “Accelerated Curing of Adhesives in Bonded Joints by Induction Heating, Army Research Laboratory Technical Report, ARL-TR-2103, October 1999.

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