The present investigation aims at studying the tapping process of a three-layer stack constituted by two CFRP layers and a core plate in AA7075 aluminum alloy. The CFRP laminates were obtained by a pre-impregnated woven sample made up of T700 carbon fibers and a thermoset epoxy matrix. Tapping experiments were performed on a 5-axis machining center instrumented with a dynamometer to measure thrust force generated during process. A high-speed steel tool, coated with nanocomposite TiAlN, was used. According to the tool manufacturer recommendations, rotational speed and feed rate were 800 rpm and 1000 mm/min, respectively. Similar thrust force time history responses were obtained by tapping different holes, even though the vertical force increases with number of threaded holes. Furthermore, a quantitative evaluation of delamination at the periphery of entry holes was carried out. The delamination at the entry hole strongly increases with number of threaded holes.
Study of tapping process of carbon fiber reinforced plastic composites/AA7075 stacks / D'Orazio, A.; El Mehtedi, M.; Forcellese, A.; Nardinocchi, A.; Simoncini, M.. - ELETTRONICO. - 1960:(2018), p. 070010. (Intervento presentato al convegno ESAFORM 2018 tenutosi a PALERMO, ITALY nel 23–25 April 2018) [10.1063/1.5034906].
Study of tapping process of carbon fiber reinforced plastic composites/AA7075 stacks
D'Orazio A.;El Mehtedi M.;Forcellese A.;Simoncini M.
2018-01-01
Abstract
The present investigation aims at studying the tapping process of a three-layer stack constituted by two CFRP layers and a core plate in AA7075 aluminum alloy. The CFRP laminates were obtained by a pre-impregnated woven sample made up of T700 carbon fibers and a thermoset epoxy matrix. Tapping experiments were performed on a 5-axis machining center instrumented with a dynamometer to measure thrust force generated during process. A high-speed steel tool, coated with nanocomposite TiAlN, was used. According to the tool manufacturer recommendations, rotational speed and feed rate were 800 rpm and 1000 mm/min, respectively. Similar thrust force time history responses were obtained by tapping different holes, even though the vertical force increases with number of threaded holes. Furthermore, a quantitative evaluation of delamination at the periphery of entry holes was carried out. The delamination at the entry hole strongly increases with number of threaded holes.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
