Local Strain Analysis in a Uni-Directional Fiber-Reinforced Composite: DIC Versus FEA

  • A. SharmaEmail author
  • S. Daggumati
Conference paper


This paper presents an experimental and numerical local strain analysis comparison in a Uni-Directional (UD) composite laminate at inter- and intra-ply level under flatwise (through thickness) compression load. The aim of the current study is to understand the load transfer mechanism between different plies by studying the local strain variation in the through-thickness direction. In order to capture the strain gradient within the ply as well as between different plies, digital image correlation (DIC) is conducted on the polished edges of the composite laminate. To capture the local strain variation, contrast to the regular paint speckle pattern, the inherent microstructure of the composite test specimen is used as a speckle pattern for computing the strains. In addition to the experimental strain analysis, numerical micro-level Finite Element (FE) simulations were accomplished. Experimental and numerical strain analyses lead to the following conclusions: (a) the implemented DIC technique is able to accurately capture the strain gradient between the resin-rich regions and the ply both qualitatively and quantitatively; (b) ply outer fibrils closer to the interleave resin region experience the maximum normal compressive strain gradient compared to the fibers within the ply.


Digital image correlation (DIC) Polymer matrix composite (PMC’s) Technical testing Finite element analysis (FEA) 



The authors would like to acknowledge the assistance provided by former colleagues Sriram K, Suresh Subramanian and Josh Dustin at GE Global Research for experimental testing of the composites.


  1. 1.
    Cs. Varga, N. Miskolczi, L. Bartha and G. Lipóczi, Improving the mechanical properties of glass-fiber-reinforced polyester composites by modification of fiber surface, Materials & Design, 31(2010) 185–193.CrossRefGoogle Scholar
  2. 2.
    L.P. Canal, C. González, J.M. Molina-Aldareguía, J. Segurado and J. LLorca, Application of digital image correlation at the microscale in fiber-reinforced composites, Composites Part A: Applied Science and Manufacturing, 43(2012) 1630–1638.CrossRefGoogle Scholar
  3. 3.
    M. Mehdikhani, M. A. Aravand, B. Sabuncuoglu, M. G. Callens, S. V. Lomov and L. Gorbatikh, Full-field strain measurements at the micro-scale in fiber-reinforced composites using digital image correlation, Composite Structures, 140(2016) 192–201.CrossRefGoogle Scholar
  4. 4.
    M. Mehdikhani, A. Matveeva, M. Ali Aravand, B. L. Wardle, S. V. Lomov and L. Gorbatikh, Strain mapping at the micro-scale in hierarchical polymer composites with aligned carbon nanotube grafted fibers, Composites Science and Technology, 137(2016) 24–34.CrossRefGoogle Scholar
  5. 5.
    S. J. Hooper, Composite materials testing and design, ASTM 1998, 13(1998), ISBN-13: 978-0803124783.Google Scholar
  6. 6.
    D. Koblar, J. Škofic and M. Boltežar, Evaluation of the Young’s modulus of Rubber-Like Materials Bonded to Rigid Surfaces with Respect to Poisson’s Ratio, Strojniški vestnik - Journal of Mechanical Engineering, 60(2014) 506–511.CrossRefGoogle Scholar
  7. 7.
    S. Daggumati, E. Voet, W. Van Paepegem, J. Degrieck, J. Xu, S.V. Lomov and I. Verpoest, Local strain in a 5-harness satin weave composite under static tension: Part I – Experimental analysis, In Composites Science and Technology, 71(2011) 1171–1179.CrossRefGoogle Scholar
  8. 8.
    S. Daggumati, K. Sriram, S. Subramanian and J. Dustin, Multiscale strain measurement using digital image correlation, Comptest-2015. IMDEA Materials, Spain, March 2015.Google Scholar
  9. 9.
    A. Arteiro, G. Catalanotti, A. R. Melro, P. Linde and P. P. Camanho, Micro-mechanical analysis of the in situ effect in polymer composite laminates, Composite Structures, 116(2014) 827–840.CrossRefGoogle Scholar
  10. 10.
    S. Daggumati, W. V. Paepegem, J. Degrieck, J. Xu, S.V. Lomov and I. Verpoest, Local damage in a 5-harness satin weave composite under static tension: Part II – Meso-FE modelling, Composites Science and Technology, 70(2010)1934–1941.CrossRefGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringIIT IndoreIndoreIndia

Personalised recommendations