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Title: Experimental Investigations And Multi Response Optimization In Pulsed Nd Yag Laser Cutting Of Novel Frp Composite Materials
Researcher: Gautam Girish Dutt
Guide(s): Dhananjay R. Mishra
Keywords: Engineering and Technology,Engineering,Engineering Mechanical
University: Jaypee University of Engineering and Technology, Guna
Completed Date: 2020
Abstract: In recent years, Kevlar and Basalt fiber-based composites are in increasingly high demand in various sectors particularly in defense, aerospace and automotive industries. Typical applications of these composites in the automobile and aerospace sectors need precise and dimensionally accurate machining. Laser cutting proves its suitability over conventional techniques during the processing of fiber reinforced polymer composites due to its unique characteristics such as material versatility and no tool wear etc. It also offers precise and accurate cutting in term of geometrical characteristics such as widths, deviations and taper of the kerf. In the present thesis, a pulsed Nd:YAG laser system is used for cutting of fabricated Kevlar, Basalt and their hybrid composite laminate. A range of experiments has been performed with varied values of five laser cutting parameters such as lamp current, pulse width, pulse frequency, air pressure and cutting speed. Key geometrical quality characteristics viz. top and bottom kerf widths, kerf deviations and kerf taper have been considered as output performance measures. Experimentally observed data have been used to develop adequate mathematical models and statistical analysis. In order to improve the dimensional accuracy of the proposed composites during laser cutting, three different multi-response optimization techniques such as Teaching-learning based optimization algorithm, Firefly algorithm and Grey relational analysis based genetic algorithm have been employed. Validation experiments show that the proposed optimal range of parameters improved the overall geometrical quality by 15.07 %, 15.97 % and 15.02 % for Kevlar, Basalt and their hybrid composite respectively. From the parametric effect analysis, it has been revealed that the geometry of cut is not only affected by laser cutting parameters but also affected by the specific properties of respective fibers and epoxy resin.
Pagination: xviii; 221p.
Appears in Departments:Department of Mechanical Engineering

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01_title page.pdfAttached File91.4 kBAdobe PDFView/Open
02_certificate.pdf181.64 kBAdobe PDFView/Open
03_declaration.pdf173.52 kBAdobe PDFView/Open
05_acknowledgement.pdf38.31 kBAdobe PDFView/Open
06_list of acronyms and abbreviations.pdf166.33 kBAdobe PDFView/Open
08_list of figures.pdf616.97 kBAdobe PDFView/Open
09_list of tables.pdf197.94 kBAdobe PDFView/Open
11_abstract.pdf155.43 kBAdobe PDFView/Open
12_chapter 1.pdf759.24 kBAdobe PDFView/Open
13_chapter 2.pdf4.76 MBAdobe PDFView/Open
14_chapter 3.pdf5.16 MBAdobe PDFView/Open
15_chapter 4.pdf12.34 MBAdobe PDFView/Open
16_chapter 5.pdf16.56 MBAdobe PDFView/Open
17_chapter 6.pdf15.79 MBAdobe PDFView/Open
18_conclusions and scope of future work.pdf288.39 kBAdobe PDFView/Open
19_bibliograpgy.pdf1.96 MBAdobe PDFView/Open
20_appendix i.pdf1.2 MBAdobe PDFView/Open
21_appendix ii.pdf806.64 kBAdobe PDFView/Open
22_experimentation.pdf193.11 kBAdobe PDFView/Open
23_publications.pdf3.3 MBAdobe PDFView/Open
contents.pdf237.15 kBAdobe PDFView/Open
list of publications.pdf63.87 kBAdobe PDFView/Open

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