Journal Publications

Journal papers

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2015
1 James Lowrie and Gracious Ngaile, Novel extrusion punch design for elimination of punch ejection load and enhanced lubrication Manufacturing letters, 5(2015) pp 12-16, http://dx.doi.org/10.1016/j.mfglet.2015.04.003

2014
1 Ngaile,G., Wang, J. Gau. JT., Challenges in Teaching Modern Manufacturing Technologies, CEEE European Journal of Engineering Education, Volume 40, Issue 4, 2015 DOI:10.1080/03043797.2014.1001814
2 Gracious Ngaile and James Lowrie, New Micro Tube Hydroforming System Based on Floating Die Assembly Concept, Journal of Micro- and Nano-Manufacturing (2014), Vol. 2, DOI: 10.1115/1.4028320
3 Gracious Ngaile, Peter Lohr, James Lowrie, Rhyne Modlin, Development of chemically produced hydrogen energy-based impact bonding process for dissimilar metals, Journal of Manufacturing processes 2014, Pages 518–526, doi:10.1016/j.jmapro.2014.07.005

2013
1 Gracious Ngaile, Peter Lohr, Rhyne Modlin, James Lowrie,High-velocity impact bonding of dissimilar metals by chemically produced hydrogen energy, Manufacturing letters 2(2014) 40-43
2 Steven Hummel, Gracious Ngaile, Die-less hydroforming of multi-lobe tubular structures, Proc IMechE Part B: J Engineering Manufacture 1–18, (2014) [DOI: 10.1177/0954405414528166]

2012
1 Bandar Alzahrani, Gracious Ngaile, Chen Yang, Part 1: Analytical modeling of symmetric multi-none tube hydroforming, Journal of Manufacturing Processes, Volume 15, Issue 2, April 2013, Pages 273-286
2 Bandar Alzahrani, Gracious Ngaile, Part 2: Analytical modeling of regular planar polygon tube hydroforming as a special case of symmetric multi-nose tube hydroforming, Journal of Manufacturing Processes, Volume 15, Issue 2, April 2013, Pages 287-297

2011
1 Gracious Ngaile, Chen Yang, and Obadiah Kilinzo, Real-Time Friction Error Compensation in Tube Hydroforming Process Control, ASME Journal of Manufacturing Sciences, December 2011, Vol. 133 /061028-1 [DOI: 10.1115/1.4005430]
2 Chen Yang and Gracious Ngaile, Preform Design for Tube Hydroforming Based on Wrinkle Formation, ASME Journal of Manufacturing Sciences, December 2011, Vol. 133 /061014-1 [DOI: 10.1115/1.4005118]
3 Cristina Bunget and Gracious Ngaile, Influence of Ultrasonic Vibration on Micro-extrusion,Ultrasonics 51(2011)606-616 [doi:10.1016/j.ultras.2011.01.001]
4 Gracious Ngaile and Grant Welch, Optimal Load Path Input in Tube Hydroforming Machines, (2011) Proc. IMechE Vol. 225 Part B: J. Engineering Manufacture, [DOI: 10.1177/0954405411428421]

2010
1 Angshuman Ghosh,Karan Deshmukh,Gracious Ngaile , Database for real-time loading path prediction for tube hydroforming using multidimensional cubic spline interpolation, J. Mater. Process. Tech. (2010) PDF
2 C. Yang and G. Ngaile, Preform design for forging and extrusion processes based on geometrical resemblance, Proc. IMechE Vol. 224 Part B: J. Engineering Manufacture, (2010) pp 1409-1422 PDF

2009
1 Gracious Ngaile and Chen Yang, “Analytical Model for the characterization of guiding zone tribo-test for tube hydroforming” ASME Journal of Manufacturing Sciences,APRIL 2009, Vol. 131 / 021008-1 PDF
2 Gracious Ngaile and Chen Yang, (2009) “Application of Finite Element Method in Metal forming Tribology”, NAMRI/SME Vol 37,(2009) pp 379-386 PDF

2008
1 Gracious Ngaile and Cristina Bunget, “Influence of Ultrasonic Vibration on Microforming”, Transaction of NAMRI/SME Vol 36, (2008) pp137-144 PDF
2 Gracious Ngaile and Chen Yang. PART 1: “Analytical model for characterizing the pear shape tribotest for tube hydroforming”, Proc IMechE Vol 222 Part B Journal of Engineering Manufacture, ( 2008 )pp 849-863 PDF
3 Gracious Ngaile and Chen Yang. PART 2: “Application of Analytical model for characterizing the pear shape tribotest for tube hydroforming”, Proc IMechE Vol 222 Part B Journal of Engineering Manufacture, ( 2008 )pp 865-873 PDF
4 Chen Yang and Gracious Ngaile, “Analytical Model for Planar Hydroforming: Prediction of formed shape, corner fill, wall thinning, and forming pressure”, International Journal of Mechanical Sciences, Volume 50, Issue 8, (August 2008), Pages 1263-1279 PDF
5 Gracious Ngaile and Frank Botz, “Performance of Graphite and Boron-Nitride-Silicone Based Lubricants and Associated Lubrication Mechanisms in Warm Forging of Aluminum”, ASME Journal of Tribology, Vol. 130 (April 2008), pp 021801-1021801-7 PDF

2007
1 Gracious Ngaile, Joseph Cochran, David Stark, “Formulation of Polymeric Based Lubricant for Metal Forming, Journal of Engineering Manufacture”, IMechE Vol. 221 (2007) pp 559-569 PDF
2 Gracious Ngaile, Saiki Hiroyuki, Liqun Ruan, Yasuo Marumo, “A Tribo-Testing Method for High Performance Cold Forging Lubricants”, Wear 262(2007) 684-692 PDF
3 M. Gariety, G. Ngaile, and T. Altan, “Evaluation of environmentally friendly lubricants for cold forging processes ” International Journal of Machine Tools & Manufacture, Vol 47 (2007) 673-681. PDF

2006
1 Gracious Ngaile, Mark Gariety, and Taylan Altan, “Enhancing Tribological Conditions in Tube Hydroforming By using Textured tubes”, ASME Journal of Tribology, Vol. 128(2006) pp 674-676. Abstract
2 Taylan Altan, Nitin Jain, and Xiaoxiang Shi, Gracious Ngaile, Progressive Die Sequence Design for Deep Drawing Round Cups Using Finite Element Analysis, ASME Journal of Manufacturing, Vol. 128(2006) pp 336-369 Abstract
3 Gracious Ngaile, David Stark and Joseph Cochran, Development of Polymeric Based Lubricant for Cold Forging Processes, Transaction of the North American Manufacturing Research Institution of SME 2006, V 34 pp 563-570 Abstract

2005
1 Shrinidhi, Chandrasekharan, Hariharasudhan Palaniswamy, Nitin Jain, Gracious Ngaile, Taylan Altan Evaluation of Stamping Lubricants at Various Temperature Levels Using the Ironing Test , International Journal of Machine Tools & Manufacture 45 (2005) 379–388 Abstract

2004
1 Gracious Ngaile, Stefan Jaeger, Taylan Altan” Lubrication in Tube Hydroforming (THF) Part I: Lubrication Mechanisms and Development of Model Tests to Evaluate Lubricants and Die Coatings in the Transition and Expansion Zones, Journal of Materials Processing Technology, 146(2004) pp 108-115 Abstract
2 Gracious Ngaile, Stefan Jaeger, Taylan Altan” Lubrication in Tube Hydroforming (THF) Part II: Performance Evaluation of Lubricants using LDH test and Pear Shaped Tube Expansion Test, Journal of Materials Processing Technology, 146(2004) pp 116-123. Abstract
3 Gerhard Gutscher, Hsien-Chih Wu, Gracious Ngaile, Taylan Altan” Determination of formability and flow stress curve for sheet metals using the viscous pressure bulging (VPB) test” , Journal of Materials Processing Technology, 146(2004) pp 1-.7 Abstract
4 Hariharasudhan Palaniswamy, Gracious Ngaile, Taylan Altan “Optimization of blank dimensions to reduce spring-back in flex forming process, Journal of Materials Processing Technology, 146(2004) pp 28-34. Abstract
5 Yingyot aue-U-Lan, Gracious Ngaile, Taylan Altan “Optimizing tube hydroforming using process simulation and experimental verification, Journal of Materials Processing Technology, 146(2004) pp 137-143. Abstract
6 Manas Shirgaokar, Gracious Ngaile, Taylan Altan, Jang-Horng Yu, John Balconi, Richard Rentfrow, and WJ Worrell ” Hydraulic Crimping: Application to assembly of tubular components”, Journal of Materials Processing Technology, 146(2004) pp 44-51 Abstract
7 Manas Shirgaokar, Hyunjoong Cho, Gracious Ngaile, Taylan Altan, Jang-Horng Yu, John Balconi, Richard Rentfrow, and WJ Worrell ” Optimization of mechanical crimping to assemble tubular components , Journal of Materials Processing Technology, 146(2004) pp 35-43. Abstract
8 Hariharasudhan Palaniswamy, Gracious Ngaile, Taylan Altan, “Finite Element Simulation of Magnesium Alloy Sheet Forming at Elevated Temperatures , Journal of Materials Processing Technology, 146(2004) pp 52-60 Abstract

2003
1 Patrick H. Wenning, Gracious Ngaile, Taylan Altan, “Design of a fastener clinching process using FEM” Transaction of the North American Manufacturing Research Institution of SME 2003 Abstract
2 H. Cho, G. Ngaile, Simultaneous Determination of Flow Stress and Interface Friction by Finite Element Based Inverse Analysis, Annals of the CIRP Vol. 52/1/2003 Abstract

2001
1 Gracious Ngaile, Vicenzo Federico, Khaled Tibari, and Taylan Altan ” Lubrication in Tube Hydroforming (THF)” Transaction of the North American Manufacturing Research Institution of SME 2001, PP 51-57 Abstract

2000
1 Hiroyuki Saiki, Yasuo Marumo, Liqun Ruan and Gracious Ngaile “ Evaluation Method of Tribological Conditions in Net Shape Cold Forging of Products with Concave-Convex Profiles” , Japanese Technology of plasticity, Vol.41 No.477 October 2000 Abstract

1999
1 Gracious Ngaile, Hiroyuki Saiki,” Cold forging tribo-test based on variation of deformation patterns at the tool-work piece interface”, Journal of tribologist and lubrication engineers (STLE) Feb, 1999). Abstract

1997
1 Hiroyuki Saiki, Gracious Ngaile, Liqun Ruan, “Characterization of adhesive strength of phosphate coatings in cold metal forming”, Journal of Tribology (ASME) 1997 Vol 119 pp 667-671 Abstract
2 Hiroyuki Saiki, Gracious Ngaile, Liqun Ruan, “Influence of die geometry on the workability of conversion coatings combined with soap lubricant in cold forming of steels”. Journal of material processing technology 63(1997) pp. 238-243 Abstract

1995
1 Gracious Ngaile, J. Mshana & A. Sigh. “A New Prototype of a pineapple peeling machine”, University of Dar Es Salaam – Uhandisi Journal (1995) pp 117-132. Abstract

Non-Refereed Journals

N0. Title Abstract
1 Gracious Ngaile, Gerhard Gutscher, and Taylan Altan, Evaluating friction and formability in stamping. Practical methods for production. Stamping Journal, Vol 12. No. 5 pp 26-28 Abstract
2 Gracious Ngaile, & Taylan Altan, “Practical Methods for Evaluation Lubricants for Tube Hydroforming” Hydroforming Journal, March 2001, pp. 8-12 Abstract
3 Nitin Jain, Xiaoxiang Shi, Gracious Ngaile, Taylan Altan, Briyan Pax Brent Harman and Greg Homan, “ Simulation Confirms Deep-Draw Die Design”, Metalforming journal, Nov 2003 Abstract

Compendium of References

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Papers submitted for Review

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