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Experimental study of the drilling of aramid composites
No full textAbstract
Major drilling characteristics of Aramid fiber-reinforced plastics are experimentally investigated. The chip appears highly deformed and tends to smear on the tool. Forces and, mainly, torque are more influenced by the tool diameter than by the feed rate and cutting speed. On the contrary, the specific cutting energy strongly depends upon the feed rate due to size effects of the tool tip. The damage in the work, i.e., delamination at entry and exit side, can be controlled by taking into account the relationships between machining parameters and forces and torque. Generally, the tool fails by gross brittle failure at the periphery rather than by generalized land wear
Cutting mechanisms in drilling of aramid composites
No full textThe results of an experimental research on the drilling of aramid fibre reinforced plastics are reported. A drilling machine has been instrumented in order to detect the thrust force and the torque as a function of the depth of the hole. The signals of the transducers were acquired by an analog to digital converter card inserted in a personal computer. The apparatus enabled analysis of the cutting mechanism of commercially available twist drills intended for the drilling of aramid fibre reinforced plastics. Relationships have been evidenced between the trends of the thrust force and the torque with regard to the tool bit geometry and the composite structure, for different feed rates and for different composite constructions. The thrust force shows irregular courses which are discussed in terms of non-uniform distribution of the thrust force along the tool cutting edges and of poor interlaminar strength of composites. A continuous decrease of the thrust force mean value has also been found which has been attributed to the heat build-up at the cutting front. The torque is strongly influenced by friction at the lands of the twist drill. © 1991
Flexural Properties and Dynamic Mechanical Response of Carbon Fiber Reinforced Composites
No full textNota Tecnic
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