THE EFFECT OF SUPPORT PLATE ON DRILLING-INDUCED DELAMINATION

Authors

  • Navid Zarif Karimi University of Bologna, Via Fontanelle 40, Forli, Italy
  • Hossein Heidary University of Tafresh, Tehran Road 1, Tafresh, Iran
  • Parnian Kianfar Amirkabir University of Technology, Hafez 424, Tehran, Iran
  • Mahmud Hasani Amirkabir University of Technology, Hafez 424, Tehran, Iran
  • Giangiacomo Minak University of Bologna, Via Fontanelle 40, Forli, Italy

DOI:

https://doi.org/10.14311/APP.2016.3.0019

Abstract

Delamination is considered as a major problem in drilling of composite materials, which degrades the mechanical properties of these materials. The thrust force exerted by the drill is considered as the major cause of delamination; and one practical approach to reduce delamination is to use a back-up plate under the specimen. In this paper, the effect of exit support plate on delamination in twist drilling of glass fiber reinforced composites is studied. Firstly, two analytical models based on linear fracture mechanics and elastic bending theory of plates are described to find critical thrust forces at the beginning of crack growth for drilling with and without back-up plate. Secondly, two series of experiments are carried out on glass fiber reinforced composites to determine quantitatively the effect of drilling parameters on the amount of delamination. Experimental findings verify a large reduction in the amount of delaminated area when a back-up plate is placed under the specimen.

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Published

2016-02-11

Issue

Vol. 3 (2016): XIVth YOUTH SYMPOSIUM ON EXPERIMENTAL SOLID MECHANICS

Section

Articles

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