Influence of fibre on the cutting stress state in machining idealized glass fibre composite

Abstract

The machining of an idealized glass fibre reinforced plastic (GFRP) was examined using photo-elasticity, dynamometry and optical microscopy. Cutting stresses at the glass roving and roving-matrix interface were evaluated using experimental and numerical methods. Experimentally observed isochromatics and measured forces in the orthogonal cutting of GFRP were shown to be affected by the reinforcement and its orientation. Machining stresses and machined surface damage were found to be highest when machining materials with roving oriented 45° towards the cutting edge.

Numerical and experimental investigation of the hole saw tool geometry effects on drilling of random chopped fiber composites

“…The obtained result reveals that the rake angle has a significant influence on the thrust force. The same finding was also reported by Wern et al 38 and Kahwash et al 39 using numerical and experimental studies during the orthogonal cutting of composites. In fact, for a high rake angle, the tool becomes sharp, which induces a decrease on the thrust force.…”

“…The positive rake angle higher than 30° cannot be industrially adopted. 37 Furthermore, the negative rake angle is not inspected as it generates a rough surface according to Wern et al 38…”

Modeling of machining of composite materials: A review

“…The next major study was conducted by Wern and Ramulu [18,19], on the influence of fiber orientation on the cutting forces and fiber pull-out in glass-fiber-composites (GFRP). They concluded that the tool with a positive rake angle resulted in the least amount of damage in the machined composite and lower cutting force.…”