Mechanism of chip formation and surface-defects in orthogonal cutting of soft-brittle potassium dihydrogen phosphate crystals
نویسندگان
چکیده
Micromachining repair of surface defects on KH2PO4 (KDP) optics is an emerging technique in the construction Inertial Confinement Fusion facilities for obtaining clean nuclear fusion energy. However, this method yet facing considerable challenges owing to soft-brittle nature single-crystal KDP, hence it necessary understand its ductile-regime cutting mechanism generate crack-free surfaces. This paper seeks investigate evolution different with change uncut chip thickness (UCT) KDP orthogonal processes. A transition modes from plastic shear-crack and then fracture rise UCT has been revealed. To explain these phenomena, a novel theoretical model was proposed by calculating specific energy dissipation crack/fracture propagations during processes based mechanics. analytical well validated analysis forces machined quality. Nevertheless, three kinds have observed, i.e. micro pits, craters edge chipping. These were caused tearing spalling materials elastic recovery, crack propagation along cleavage planes ploughing effect, peeling away large-size fracture, respectively. The presented results great significance promoting application micromachining future engineering optics.
منابع مشابه
Photoacoustic characterization of transient defects in potassium dihydrogen phosphate crystals
O. Martı́nez Matos, G. A. Torchia, G. M. Bilmes, and J. O. Tocho Centro de Investigaciones Ópticas-CIOp(CONICET CIC), CC 124, 1900 La Plata, Argentina Facultad de Ciencias Exactas, Universidad Nacional de La Plata, 47 y 115, 1900 La Plata, Argentina Facultad de Ingenierı́a, Universidad Nacional de La Plata, 1 y 47, 1900 La Plata, Argentina ~Received 27 June 2003; revised manuscript received 13 Fe...
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ژورنال
عنوان ژورنال: Materials & Design
سال: 2021
ISSN: ['1873-4197', '0264-1275']
DOI: https://doi.org/10.1016/j.matdes.2020.109327