Journal of Materials Research and Technology Journal of Materials Research and Technology
J Mater Res Technol 2018;7:89-95 DOI: 10.1016/j.jmrt.2017.06.010
Original Article
Experimental investigation of span length for flexural test of fiber reinforced polymer composite laminates
Akhil Mehndirattaa,, , Spandan Bandyopadhyayab, Vijaya Kumarc, Dhiraj Kumara
a Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand, India
b Indian Institute of Engineering Science and Technology, West Bengal, India
c Hindustan Aeronautics Limited, Bangalore, India
Received 07 March 2016, Accepted 21 June 2017

Testing and evaluation of mechanical properties for FRP (Fiber Reinforced Polymer) composite parts play a significant role to qualify it for the end use. Among the mechanical properties, the flexural strength is significant and vital as it may vary with specimen depth, temperature and the test span length. The flexural strength varies for different materials with varying the test span length hence the current work aims to find an optimum span length to test flexural strength for the specimens made of Glass (7781, EC9756) and Carbon (HTA7, G801) prepreg materials. Experiments are conducted as per the ASTM Standard D 790 for flexural test by varying the span lengths to understand the behavior of the flexural strength and flexural modulus. The experimental data were compared with those obtained from the finite element program software Altair Hyper works 14.0. The results indicate that flexural modulus increases with the span length to a point and then it decreases. Thereby, an optimum span length can be obtained for testing flexural strength, which will be useful to the designers and the composite manufacturers to accomplish better standard testing procedures.

Carbon, Glass, Flexural, Prepreg, Span length, FEA
J Mater Res Technol 2018;7:89-95 DOI: 10.1016/j.jmrt.2017.06.010