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Titre :
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Parametric study of precision abrasive aachining arocesses for ultra-precise finishing
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Auteurs :
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Kahina Taieb, Auteur ;
Nabil Belkhir, Directeur de thèse
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Type de document :
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document électronique
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Editeur :
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Sétif : Université Ferhat Abbas institut d’optique et de mécanique de précision, 2025
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ISBN/ISSN/EAN :
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E-TH/2500
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Format :
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1vol. (129 f.) / ill.en coul.
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Note générale :
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Bibliogr.
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Langues:
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Anglais
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Catégories :
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Thèses (en français - en anglais) > Document électronique
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Mots-clés:
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Bismuth Germanate (BGO)
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Time-of-Flight Positron Emission Tomography (TOF-PET)
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Résumé :
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This thesis investigates the ultra-precision machining of brittle Bismuth Germanate (BGO) single crystals, a key material in Time-of-Flight Positron Emission Tomography (TOF-PET) detectors. Due to its hardness and low fracture toughness, BGO presents significant challenges during micromachining. A combined experimental and numerical approach was developed. Mechanically prepared BGO samples underwent polishing process, evaluating the effects of abrasive size, pressure, and speed on surface roughness and optical transmittance. A strong link was established between improved surface quality and enhanced light transmission. To model BGO’s cutting behavior, a finite element simulation using the Johnson-Holmquist II (JH-2) model was implemented and validated with micro-milling and drilling experiments. The study analyzed material removal mechanisms, cutting forces, and the brittle-to-ductile transition. The results offer clear guidelines for minimizing machining damage and improving BGO performance in TOF-PET systems. This work contributes to precision manufacturing of brittle materials and supports advancements in medical imaging technologies.
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Côte titre :
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E-TH/2500
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En ligne :
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http://dspace.univ-setif.dz:8888/jspui/bitstream/123456789/6231/1/Thesis-%20Taieb%20Kahina%20FInal%20Version%202025%20July.pdf
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Exemplaires (1)
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| E-TH/2500 | Thèse | Bibliothèque centrale | Disponible |
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