Experimental Studies on Strength Behaviour of Notched Glass/Epoxy Laminated Composites under Uni-axial and Bi-axial Loading

  • V. L. Jagannatha GupthaEmail author
  • Ramesh S. Sharma
Original Contribution


The use of FRP composite materials in aerospace, aviation, marine, automotive and civil engineering industry has increased rapidly in recent years due to their high specific strength and stiffness properties. The structural members contrived from such composite materials are generally subjected to complex loading conditions and leads to multi-axial stress conditions at critical surface localities. Presence of notches, much required for joining process of composites, makes it further significant. The current practice of using uni-axial test data alone to validate proposed material models is inadequate leading to evaluation and consideration of bi-axial test data. In order to correlate the bi-axial strengths with the uni-axial strengths of GFRP composite laminates in the presence of a circular notch, bi-axial tests using four servo-hydraulic actuators with four load cells were carried out. To determine the in-plane strength parameters, bi-axial cruciform test specimen model was considered. Three different fibre orientations, namely, 0°, 45°, and 90° are considered with a central circular notch of 10 mm diameter in the present investigation. From the results obtained, it is observed that there is a reduction in strength of 5.36, 2.41 and 13.92% in 0°, 45°, and 90° fibre orientation, respectively, under bi-axial loading condition as compared to that of uni-axial loading in laminated composite.


GFRP Cruciform specimen Bi-axial loading Notches Fiber orientation 



Authors thankfully acknowledge Structures Panel, AR&DB, New Delhi, India for the financial support granted under the project DARO/08/1051691/M/I to carry out the present work. The authors also thank the Management, Principal, Head of the Department, Mechanical Engineering Department, R V College of Engineering, Bangalore, India for their support and encouragement extended during this work.


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Copyright information

© The Institution of Engineers (India) 2017

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringRashtreeya Vidyalaya College of EngineeringBangaloreIndia

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