Following is a computer code which you can run for:

  1. Calculation of laminate properties
  2. Calculation of deformation and twist under load, mechanical or thermal
  3. Failure analysis to determine the sequence of ply failures

Disclaimer: I do not guarantee that this software has no errors. Especially in the hygrothermal behavior of composites.

Link for the code: composite


Dr. Dayal's area of interest in composite materials is in
  1. Material testing of Composites
  2. Design of Composite Material parts
  3. Nondestructive Evaluation of Composite Materials
  4. Theoretical study of Crack Interaction in composites
  5. Wave propagation in Composites

    PUBLICATIONS IN THIS AREA
  1.  David K. Hsu, Vinay Dayal, and Daniel J. Barnard, "Heat-Induced Disbonding and Degradation of Adhesive Bonds in Honeycomb Sandwich Structures," Material Evaluation, July 2009, pp. 243-250.

  2.  Douglas L. Van Otterloo and Vinay Dayal, “How isotropic are quasi-isotropic laminates”, Composites, Part A: Applied Science and manufacturing, 34(2003) 93-103.

  3. O. Unal and V. Dayal, Interlaminar Shear Strength Measurement of Ceramic Composites  by Asymmetric Four Point Bend Shear test, Material Science and Engineering, A, 349 (2003) pp170-174.

  4. A. M. Khan, D.O. Adams, V. Dayal and J. M. Vogel, "Effects of Bend-Twist
    Coupling on Composite Propeller Performance," Mechanics of Composite
    Materials and Structures, 7(4), pp383-401(Oct-Dec.2000)

  5. V. Dayal, "Lamb Wave Measurement of Elastic Constants in Composites,"
    American Society of Mechanical Engineers (ASME), NCA-Vol. 18/DE-80,
    pp 151-156, Nov. 1994.

  6. V.Dayal, "Wave Propagation in a Composite with a Wavy Sub-lamina,"
    submitted to J.of Nondestructive Evaluation.

  7. V. Dayal, and I. Mohammed, "Micro-Macro Crack Interaction in Composites,"
    Engineering Fracture Mechanics,49(5), 647-658, (1994).

  8. V. Dayal, "Fabrication and Non-Destructive Evaluation of Wavy Composites,"
    ASME, NCA-Vol.14,pp215-219 (Nov 1992).

  9. V. Dayal, "Longitudinal Waves in an Anisotropic Rod Immersed in
    Fluid," J. Acoust. Soc. of America, 93(3), 1249-1255, (1993).

  10. V. Dayal, D.K. Hsu, and X. Yang, "An exploratory study of Poltruded
    glass/polyster rods" to Composite Technologies Corp., Ames, IA(1991)

  11. V. Dayal, "Tensile Testing of Glass/Polyester Rods, " to Composiote
    Technology Corp,Ames, IA(1992).

  12. 8. V.Dayal and V.K. Kinra, "Leaky Lamb Waves in an Anisotropic Plate
    II - NDE of Matrix Cracks in Fiber-Reinforced Composites", J. Acoust.
    Soc. of America, 89(4) Pt.1, pp1590-1598 (1991).

  13. V. Dayal and V.K. Kinra, "Lamb Waves: Theory and Application to the
    NDE of Fiber-Reinforced Composites, Nondestructive Evaluation of
    Materials and Structures Using Vibration and Acoustic Techniques, NDE-Vol.6,
    Winter Annual Meeting of ASME, pp39-44(1989).

  14. V.K. Kinra and V. Dayal, " Acoustic Methods of Evaluating Elastic Properties,
    or, Will the Real Youngs Modulus Please stand up ?" Manual on Experimental Methods
    for Mechanical Testing of Composites,Ed. R.L. Pendleton and M.E.
    Tuttle, published by the Society of Experimental Mechanics.(1989).

  15. V. Dayal and V.K. Kinra, "Leaky Lamb Waves in an Anisotropic Plate
    I - An Exact Solution and Experiments," J. Acoustic Soc. of America, 85(6),
    pp 2268-2276(Jun 1989).

  16. V.K. Kinra and V. Dayal, "Nondestructive Evaluation of Composite Materials
    using Ultrasound," Acousto-Ultrasound: Theory and Applications, Ed. J.C. Duke, Jr.,
    Plenum Press, N.Y., pp.143-150(1988).

  17. V.K. Kinra and V. Dayal, "Ultrasonic NDE of Fiber-Reinforced Composite
    Materials-A Review," SADHANA-Academy Proc. in Engg. Sciences, Indian Academy of
    Sciences, V11(3&4), pp419-432 (Dec 1987).

  18. V. Dayal, " Ultrasonic Nondestructive Evaluation of Composite Materials",
    Ph. D. dissertation, Texas A&M University, (1987).

  19. K.A. Jacob, V. Dayal and B. Ranganayakamma, "On Stress Analysis of
    Anisotropic Composites Through Transmission Optical Patterns:
    Isochromatics and Isopachics," Expt. Mechanics, 23, 49-54, (1983).


  20. CONFERENCE PROCEEDINGS
  21. V. Dayal, V.K. Kinra and J.G. Eden, "Ultrasonic NDE of Fiber Reinforced
    Materials", Int.Symp. on Composite Materials '86, Beijing, China.
  22. V. Dayal and V.K. Kinra, "Ultrasonic NDT of Composite Materials", 3rd
    US-Japan Conference on Composite Materials, Tokyo, Japan, 1986.
  23. V. Dayal and V.K. Kinra, "Ultrasonic NDE of Composite Transverse Cracks",
    1986 SEM Fall Conference, Keystone Colorado, Nov 1986.
  24. V. Dayal and V.K. Kinra, "Non-Destructive Evaluation of Composite
    Materials Using Ultrasound", 16th NDE Conference, San Antonio, (Apr 1987),
    also Proc. of SEM Spring Conference, Houston, June 1987.
  25. V. Dayal and V.K. Kinra, "Non-Destructive Evaluation of Matrix Cracks
    in Fiber-reinforced Composites by Leaky Lamb Waves", Proc. of Second Int. Conf.
    Testing and Evaluation and Quality Control of Composites, Surrey, U.K., Sept 1987.
  26. V.Dayal and D. K.Hsu, "Further Studies on the NDE of Polymeric Composites", Review of Prog.
    in Quantitative NDE, La Jolla, CA, (July 1990).
  27. V.Dayal, J. Mokhtar, and D.K. Hsu, "Ultrasonic Evaluation of Damage Zone i
    Glass/epoxy and Glass/Vinylester Composites, Review of Progress in Quantitative NDE,
    Brunswick, Maine, July 28-Aug.2,1991.
  28. V. Dayal and Zang Xinlian, "Fabrication and NDE of Multi-Wave Thermo-Set Gr/Ep Composites",
    Presented at Review of Progress in QNDE, La Jolla, CA, July 20-25, 1992.
  29. V. Dayal, Xinlian Yang, and D.K. Hsu, "Non-destructive evaluation of Pultruded composites,
    "Proc.Noise-Con 93, Williamsburg Virginia, May 2-5, 1993, Ed. H.V. Hubbard,
    Noise Control Foundation, NY.
  30. V.Dayal, "Wave Propagation in Anisotropic Cylindrical Waveguides Immersed in water," Review
    of Progress in Quantitative Evaluation, Aug 1-6, 1993, Brunswick, Maine.
  31. V.Dayal and I. Mohammed, "Crack Interaction in Composites," AIAA 35th. Structures,
    Structural Dynamics, and Materials Conf.,Hilton Head South Carolina, April 18-20, 1994.
  32. V.Dayal, "Longitudinal Waves in Fluid Loaded Composite Cylinders," Noise-Con 94, Fort
    Lauderdale,May 1-4, 1994.
  33. V.Dayal, Compression Fatigue of Wavy Composites,' SEM Spring Conf., Baltimore, June6-8, 1994.
  34. V. Dayal, Compression-Compression Fatigue and NDE of Wavy Composites, " Int. Conf. on
    Composite Engineering, New Orleans, Aug. 28-31, 1994.
  35. Z.I. Baig and V. Dayal, "Damage Characterization around a bullet hole in
    composites," NCA-Vol. 25, Proceedings of the ASME, Noise Control and
    Acoustics Division, ASME, 1998, pp. 201-205.