Stress concentration issues in unidirectional laminates

  • Lucas Lisbôa VignoliEmail author
  • Jaime Tupiassú Pinho de Castro
  • Marco Antonio Meggiolaro
Technical Paper


This paper analytically studies how elliptical holes affect the resistance of unidirectional laminate plates. Although local stress and strain concentration effects induced by notches are well known in isotropic materials, the same cannot be said about anisotropic materials. Stroh formalism is used to describe the elastic stresses around the border of elliptical holes subjected to in-plane loads. Tsai–Wu, Puck, and LaRC05 failure criteria are applied to estimate initial damage, due to their good performance on the world-wide failure exercise. Plane strain conditions are also studied to evaluate 3D constraint effects induced by the plate thickness. The major conclusions are: (1) the stress concentration may be up to about twice higher than for isotropic materials; (2) matrix failure is observed for most cases, and the notched strength is smaller than 10% of the unnotched strength; (3) strength prediction differences assuming plane stress and plane strain limit cases may be higher than 50%; and (4) for compressive loads, the LaRC05 model predicts a considerable strength reduction when compared to the other failure criteria.


Composite Stress concentration Stroh formalism 



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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2019

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringUFRJ - Campus MacaéMacaéBrazil
  2. 2.Department of Mechanical EngineeringPUC-RioRio de JaneiroBrazil

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