Difference between revisions of "Rikesh Patel"
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keywords = "Additive manufacture", | keywords = "Additive manufacture", | ||
keywords = "Selective rework", | keywords = "Selective rework", | ||
| − | keywords = "Selective laser melting " | + | keywords = "Selective laser melting ", |
| + | abstract = "Abstract A major factor limiting the adoption of powder-bed-fusion additive manufacturing for production of parts is the control of build process defects and the effect these have upon the certification of parts for structural applications. In response to this, new methods for detecting defects and to monitor process performance are being developed. However, effective utilisation of such methods to rework parts in process has yet to be demonstrated. This study investigates the use of spatially resolved acoustic spectroscopy (SRAS) scan data to inform repair strategies within a commercial selective laser melting machine. New methodologies which allow for rework of the most common defects observed in selective laser melting (SLM) manufacturing are proposed and demonstrated. Three rework methodologies are applied to targeted surface breaking pores: a hatch pattern, a spiral pattern and a single shot exposure. The work presented shows that it is possible to correct surface breaking pores using targeted re-melting, reducing the depth of defects whilst minimising changes in local texture. For the hatch rework and spiral rework, a reduction in defect depth of 50% and 31% were observed, respectively, however, no improvement was seen after the single shot exposures. This work is part of a programme to develop a method by which defects can be detected and the part reworked in-process during \{SLM\} to enable defect specification targets to be met. Although further work in developing build-characterise-rework strategies for integrated and targeted defect correction is needed, the feasibility of the underlying method of identifying and selectively reworking to reduce a defect has now been demonstrated for the first time. " | ||
} | } | ||
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keywords = "Acoustic methods, Solar cells, Crystal structure, Microstructure, Nondestructive testing" | keywords = "Acoustic methods, Solar cells, Crystal structure, Microstructure, Nondestructive testing" | ||
} | } | ||
| − | < | + | </bibtex> |
<bibtex> | <bibtex> | ||
Revision as of 13:35, 28 November 2017
Rikesh Patel
Location
202/307 Tower, University Park
C38 SIOS Pharmacy, University Park
Phone
+44 (0)115 84-67892
rikesh.patel
Education/Posts
2004-2008 MEng Electronic and Computer Engineering (1st Class), University of Nottingham
2008-2014 PhD Electrical and Electronic Engineering (Thesis), University of Nottingham
2013-2014 Research Assistant, University of Nottingham
2014- Research Associate, University of Nottingham
Awards
- University of Nottingham interdisciplinary research funding award (UNICAS) - 2014
- Applied optics group internal research proposal review award (1st place) - 2015
Journal publications
University repository for Rikesh Patel
- Additive Manufacturing 19:127 - 133,2018
- https://www.sciencedirect.com/science/article/pii/S2214860417303925
BibtexAuthor : M. Hirsch, P. Dryburgh, S. Catchpole-Smith, R. Patel, L. Parry, S.D. Sharples, I.A. Ashcroft, A.T. Clare
Title : Targeted rework strategies for powder bed additive manufacture
In : Additive Manufacturing -
Address :
Date : 2018
Rikesh Patel, Wenqi Li, Richard J. Smith, Steve D. Sharples, Matt Clark - Orientation imaging of macro-sized polysilicon grains on wafers using spatially resolved acoustic spectroscopy
- Scripta Materialia 140(Supplement C):67 - 70,2017
- http://www.sciencedirect.com/science/article/pii/S1359646217303846
BibtexAuthor : Rikesh Patel, Wenqi Li, Richard J. Smith, Steve D. Sharples, Matt Clark
Title : Orientation imaging of macro-sized polysilicon grains on wafers using spatially resolved acoustic spectroscopy
In : Scripta Materialia -
Address :
Date : 2017
Hirsch, M., Catchpole-Smith, S., Patel, R., Marrow, P., Li, Wenqi, Tuck, C., Sharples, S. D., Clare, A. T. - Meso-scale defect evaluation of selective laser melting using spatially resolved acoustic spectroscopy
- Proceedings of the Royal Society of London A: Mathematical, Physical and Engineering Sciences 473(2205),2017
- http://rspa.royalsocietypublishing.org/content/473/2205/20170194
BibtexAuthor : Hirsch, M., Catchpole-Smith, S., Patel, R., Marrow, P., Li, Wenqi, Tuck, C., Sharples, S. D., Clare, A. T.
Title : Meso-scale defect evaluation of selective laser melting using spatially resolved acoustic spectroscopy
In : Proceedings of the Royal Society of London A: Mathematical, Physical and Engineering Sciences -
Address :
Date : 2017
Rikesh Patel, Wenqi Li, Richard J. Smith, Steve D. Sharples, Matt Clark - Orientation imaging of macro-sized polysilicon grains on wafers using spatially resolved acoustic spectroscopy
- Scripta Materialia 140:67 - 70,2017
- http://www.sciencedirect.com/science/article/pii/S1359646217303846
BibtexAuthor : Rikesh Patel, Wenqi Li, Richard J. Smith, Steve D. Sharples, Matt Clark
Title : Orientation imaging of macro-sized polysilicon grains on wafers using spatially resolved acoustic spectroscopy
In : Scripta Materialia -
Address :
Date : 2017
Matthias Hirsch, Rikesh Patel, Wenqi Li, Guangying Guan, Richard K. Leach, Steve D. Sharples, Adam T. Clare - Assessing the capability of in-situ nondestructive analysis during layer based additive manufacture
- Additive Manufacturing 13:135 - 142,2017
- http://www.sciencedirect.com/science/article/pii/S2214860416301877
BibtexAuthor : Matthias Hirsch, Rikesh Patel, Wenqi Li, Guangying Guan, Richard K. Leach, Steve D. Sharples, Adam T. Clare
Title : Assessing the capability of in-situ nondestructive analysis during layer based additive manufacture
In : Additive Manufacturing -
Address :
Date : 2017
Richard J. Smith, Matthias Hirsch, Rikesh Patel, Wenqi Li, Adam T. Clare, Steve D. Sharples - Spatially resolved acoustic spectroscopy for selective laser melting
- Journal of Materials Processing Technology 236:93 - 102,2016
- http://www.sciencedirect.com/science/article/pii/S0924013616301352
BibtexAuthor : Richard J. Smith, Matthias Hirsch, Rikesh Patel, Wenqi Li, Adam T. Clare, Steve D. Sharples
Title : Spatially resolved acoustic spectroscopy for selective laser melting
In : Journal of Materials Processing Technology -
Address :
Date : 2016
Rikesh Patel, Samuel Achamfuo-Yeboah, Roger Light, Matt Clark - Widefield two laser interferometry
- Opt. Express 22(22):27094--27101, Nov 2014
- http://www.opticsexpress.org/abstract.cfm?URI=oe-22-22-27094
BibtexAuthor : Rikesh Patel, Samuel Achamfuo-Yeboah, Roger Light, Matt Clark
Title : Widefield two laser interferometry
In : Opt. Express -
Address :
Date : Nov 2014
Rikesh Patel, Samuel Achamfuo-Yeboah, Roger Light, Matt Clark - Ultrastable heterodyne interferometer system using a CMOS modulated light camera
- Opt. Express 20(16):17722--17733, Jul 2012
- http://www.opticsexpress.org/abstract.cfm?URI=oe-20-16-17722
BibtexAuthor : Rikesh Patel, Samuel Achamfuo-Yeboah, Roger Light, Matt Clark
Title : Ultrastable heterodyne interferometer system using a CMOS modulated light camera
In : Opt. Express -
Address :
Date : Jul 2012
Rikesh Patel, Matt Clark, Samuel Achamfuo-Yeboah - Widefield ultrastable heterodyne interferometry using a custom CMOS modulated light camera
- Imaging and Applied Optics pp. JWA14,2011
- http://www.osapublishing.org/abstract.cfm?URI=AIO-2011-JWA14
BibtexAuthor : Rikesh Patel, Matt Clark, Samuel Achamfuo-Yeboah
Title : Widefield ultrastable heterodyne interferometry using a custom CMOS modulated light camera
In : Imaging and Applied Optics -
Address :
Date : 2011
Rikesh Patel, Samuel Achamfuo-Yeboah, Roger Light, Matt Clark - Widefield heterodyne interferometry using a custom CMOS modulated light camera
- Opt. Express 19(24):24546--24556, Nov 2011
- http://www.opticsexpress.org/abstract.cfm?URI=oe-19-24-24546
BibtexAuthor : Rikesh Patel, Samuel Achamfuo-Yeboah, Roger Light, Matt Clark
Title : Widefield heterodyne interferometry using a custom CMOS modulated light camera
In : Opt. Express -
Address :
Date : Nov 2011
Conferences
- UON Institute of Aerospace exposition, Nottingham UK - 2010
- KTP innovate event, London UK - 2011
- OSA Optics and Photonics Congress, Toronto Canada - 2011
- IOP Photon12, Durham UK - 2012
- IOP Anglo-French physical acoustic conference AFPAC2015, Frejus France - 2015
- BINDT Aerospace event 2015, Sheffield UK - 2015
- 4th International Symposium on Laser Ultrasonics LU2015, Evanston IL USA - 2015
- 5th International Symposium on Laser Ultrasonics LU2015, Linz, Austria – 2016
- Early Stage Researchers RCNDE event, Manchester UK - 2016
- RCNDE University of Nottingham industrial tour, Nottingham UK - 2016
- Optics+Ultrasound III, Nottingham UK – 2016
- RCNDE technology transfer event, Warwick, UK - 2017
