Difference between revisions of "Rikesh Patel"

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(Journal publications)
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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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<bibtex>
 
<bibtex>
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keywords = "Acoustic methods, Solar cells, Crystal structure, Microstructure, Nondestructive testing"
 
keywords = "Acoustic methods, Solar cells, Crystal structure, Microstructure, Nondestructive testing"
 
}
 
}
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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

Email

rikesh.patelAtnotts.png

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


M. Hirsch, P. Dryburgh, S. Catchpole-Smith, R. Patel, L. Parry, S.D. Sharples, I.A. Ashcroft, A.T. Clare - Targeted rework strategies for powder bed additive manufacture
Additive Manufacturing 19:127 - 133,2018
https://www.sciencedirect.com/science/article/pii/S2214860417303925
Bibtex
Author : 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
Bibtex
Author : 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
Bibtex
Author : 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
Bibtex
Author : 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
Bibtex
Author : 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
Bibtex
Author : 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
Bibtex
Author : 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
Bibtex
Author : 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
Bibtex
Author : 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
Bibtex
Author : 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