Effect of process induced variations on machining characteristics of a model epoxy resin system

In-situ cutting temperature and machining force measurements during conventional drilling of carbon fiber polymer composite laminates

“…The axis alignment between lower and upper fixtures is critical and is ensured using predrilled alignment block and locating pins. The twist drill consisting of through coolant holes was used to embed FBG sensors with the measuring sensor section positioned near the coolant hole leading end on the drill clearance face to record machining zone temperature accurately (see Figure 3 47,48 The machining parameters controlled in this study were cutting speed and tool feed rate. In the present study, we have considered two constant spindle speed (s) values of 2500 r/min and 5000 r/min along with two constant feed rates (f) of 0.02 mm/rev and 0.002 mm/rev.…”

“…Hence, a study for obtaining an optimal average thrust force response of the actual experimental data was done using moving average technique with 2, 5, 10 point moving averaging. 48 The difference in the averaged thrust force variation obtained from different levels of moving point averaging (2, 5, 10, 12 and 15) was compared. It was observed that the difference in the averaged thrust force variation was within 2%, beyond 10 point moving averaging.…”

Manufacturing curing cycles influence on local fracture toughness properties at micro and macro scale

“…In particular, GFRP present a big challenge from the manufacturing process design point of view. Due to the small thermal conductivities of GFRP and the resin exothermal reaction, large temperature gradients can be observed during the thick laminate manufacturing through the thickness [1,2,3,4]. This can lead to strong temperature peaks above the resin degradation temperatures hampering the resin and composite mechanical properties.…”