Investigations on drilling of hemp/glass hybrid composites

ABSTRACT

The present study aimed to examine the influence of tool geometry, spindle speed and feed on thrust force (TF) and delamination in hybrid hemp-glass composites. The pure glass polyester, pure hemp polyester and hybrid hemp/glass polyester composite specimens were prepared using hand layup technique. The drilling experiments were performed according to the full factorial design. Analysis of variance (ANOVA) was used to determine the impact of layering arrangement of fibers, feed (0.06, 0.18, 0.3 mm/rev), speed (1000, 3000, 5000 rpm), tool geometry (Plexi Point, Brad, Parabolic) and their interactions on TF and delamination. It was observed that drill geometry is major determinant for TF and delamination. Empirical models were developed using regression analysis and grey relational analysis was performed for optimizing the input parameters for TF and delamination at entry and exit.

KEYWORDS:

• Delamination
• drilling
• glass fiber
• grey relational analysis
• hemp fiber
• hybrid composites
• thrust force
• tool geometry

Additional information

Funding

This work is performed as a part of research project sanctioned by Science and Engineering Research Board (SERB), New Delhi (SB/FTP/ETA-113/2012 dated 29-10-2015).