Rani El-Hajjar - Assistant Professor

Contact Information

Office Address:
EMS 1025
3200 North Cramer Street
Milwaukee, WI 53211
Phone: 414-229-3647
Fax: 414-229-6958
Email: elhajjar@uwm.edu
WWW: https://pantherfile.uwm.edu/elhajjar/www

Mailing Address:
P.O. Box 784
Department of Civil Engineering and Mechanics
University of Wisconsin-Milwaukee
Milwaukee, WI 53201

Rani El-Hajjar


Ph.D., Civil Engineering, Georgia Institute of Technology, 2004
M.S., Civil Engineering, University of Texas at Austin, 2000
B.S., Civil Engineering, University of Nebraska Lincoln-Omaha, 1998

Research Interests

Composite Materials and Structures, Experimental and Numerical Fracture Mechanics, Aircraft Structural Analysis, Nondestructive Testing and Evaluation of Composites, Sustainable Material Design, Effects of Manufacturing Anomalies on Structural Design

Industry Experience

  • Boeing Commercial Airplanes, 787 Fuselage Test, Methods and Major Tests. Everett, Washington, 2006-2009
  • Intel Corporation, D1D Fab, Hillsboro, Oregon, 2004-2006
    Professional Engineer, State of Washington

Selected Journal Publications

  • Masoodi, R., El-Hajjar, R., Pillai, K., and Sabo, R., "Mechanical characterization of a cellulose nanofiber and bio-based epoxy composite," Materials & Design, 2012. 36:570-576.
  • Sisneros, P., Peng, Y., and El-Hajjar, R.., "Fatigue and Impact Behavior of Carbon-Fiber Composite Bicycle Forks," Fatigue and Fracture of Engineering Materials and Structures, Accepted for Publication, In press
  • El-Hajjar, R., F., and Petersen, D., R., (2011) "Gaussian Function Characterization of Unnotched Tension Behavior in a Carbon/Epoxy Composite Containing Localized Fiber Waviness," Composite Structures. 93:2400–2408.
  • El-Hajjar, R., and Petersen, D., (2011), "Adhesive Polyvinyl Chloride Coatings for Quantitative Strain Measurement in Composite Materials," Composites Part B. 42(7):1929-1936.
  • Mishra, K. and El-Hajjar, R., (2011), "Nonlinear Strain Invariant Failure Approach for Fiber Reinforced Composite Materials," International Journal of Materials and Structural Integrity, In press.
  • Haj-Ali, R., Wei, B., Johnson, S. and El-Hajjar, R., “Thermoelastic and infrared-thermography methods for surface strains in cracked orthotropic composite materials,” Engineering Fracture Mechanics, vol. 75, pp.  58-75, 2008
  • Haj-Ali, R., El-Hajjar, R., and Muliana, A., “Cohesive fracture modeling of crack growth in thick-section composites,” Engineering Fracture Mechanics, vol. 73, pp. 2192-2209, 2006
  • El-Hajjar, R.  and Haj-Ali, R., “Mode-I Fracture Toughness Testing of Thick Section FRP Composites using the ESE(T) Specimen,” Engineering Fracture Mechanics, vol. 72, no. 4, pp. 631-643, 2005
  • El-Hajjar, R., and Haj-Ali, R., "Infrared (IR) Thermography for Strain Analysis in Pultruded Fiber Reinforced Plastics,” Experimental Techniques, vol. 28, no. 2, pp.19-22, 2004
  • El-Hajjar, R., and Haj-Ali, R.,  "In-plane Shear Testing of Thick-Section Pultruded FRP Composites using a Modified Arcan Fixture,” Composites Part B: Engineering, vol. 35, no. 5, pp. 421-428, 2004
  • El-Hajjar, R., and Haj-Ali, R., “A Quantitative Thermoelastic Stress Analysis Method for Pultruded Composites,” Composites Science and Technology, vol. 63, no. 7, pp. 967-978, 2003
  • Haj-Ali, R. and El-Hajjar, R.,"Crack Propagation Analysis of Mode-I Fracture in Pultruded Composites using Micromechanical Constitutive Models," Mechanics of Materials International Journal, vol. 35, no. 9, pp. 885-902, 2003

Conference Publications

  • El-Hajjar, R., and Haj-Ali, R., “Quantitative Infrared Thermoelastic Strain Analysis Methods for Notched Composites”, 2007, 22nd Annual Technical Conference of the American Society for Composites, Seattle, Washington, 2007
  • Haj-Ali, R., and El-Hajjar, R., "Modeling of Translayer Fracture in Thick-Section FRP Composites” Society for Experimental Mechanics Annual Conference, Portland, Oregon, 2005
  • Kim, H., Johnson, S., El-Hajjar, R., and Haj-Ali, R., "Infrared Thermography for Fatigue Damage Detection in Thick-Section FRP Composites," The Second International Conference on Steel & Composite Structures, Seoul, Korea, 2004
  • El-Hajjar, R.F., ”Fracture Behavior of FRP Pultruded Composites,” American Society of Testing and Materials Committee E08 on Fatigue and Fracture, Kansas City, MO,  2003
  • El-Hajjar, R., and Haj-Ali, R., "Surface Strain Measurement in Pultruded Composites using Infra Red Thermography”," Tenth International Conference on Composites/Nano Engineering ICCE-10, New Orleans, Louisiana, 2003
  • El-Hajjar, R., and Haj-Ali, R., "Fracture Toughness and Crack Growth in FRP Pultruded Composites," 16th ASCE Engineering Mechanics Conference, University of Washington, Seattle, Washington, 2003
  • Citipitioglu, A. M., El-Hajjar, R., and Haj-Ali, R., "Detailed 3D Simulation of Bolted Pultruded Composite Connections," 15th ASCE Engineering Mechanics Conference, Ed., Smyth A., Columbia University, New York, New York, 2002
  • Fowler, T. J., El-Hajjar, R.,“The New AAR procedure for Acoustic Emission Inspection of Railroad Tank Cars.” Acoustic Emission Working Group Meeting XXXXIIII, Montreal, Canada, 2001
  • El-Hajjar, R.F. and Fowler, T. J., "Structural Response of Railroad Tank Cars during Acoustic Emission Testing." American Society for Nondestructive Testing, Spring Conference, Birmingham, Alabama, 2000

Courses Taught

  • CE 303 Strength of Materials
  • CE-466 Mechanics of Composites
  • CE 502 Experimental Stress Analysis
  • CE 701 Advanced Strength of Materials
  • CE 732 Fatigue in Engineering Materials