Mechanical Engineering Engineer
Resume:
*. Personal Information
Name: Fitsum Taye Feyissa
Date of Birth: March 8, 1983
Address: Indian Institute of Technology, Delhi
Hauz Khas New Delhi 110 016, India
Mechanical Engineering Department Block II Room No.429 DFM lab.
: ******.**@*****.*** or *********@****.***.**.** 2. Objective
Highly talented and accomplished professional with more than 13years experiences in Mechanical, Manufacturing and Production Engineering field.
To work as a Post-Doctoral Researcher in the areas of:
Material selection and processing
Grain refinement through severe plastic deformation processes
Characterization of nanostructured material and retaining ductility with new experimental work
Sheet metal forming and FE Analysis
Non-conventional manufacturing processes and production
Mechanical engineering related field starting from January 2018 (date and title of the research are flexible).
3. My current research work
Cryorolling is a severe plastic deformation process in which sheets are rolled at liquid nitrogen temperature
(-196 C). It is one of the proven techniques of achieving ultrafine grained structure in Al alloys with improved strength and hardness when compared to conventional cold rolling. However, it is also usually associated with a reduction in ductility and formability. In the present work, microstructure, mechanical properties and formability of cryorolled and annealed AA5083 alloy sheets have been characterized and a comparison has been made with cold rolled and annealed sheets. 5mm thick sheets of this alloy were cryorolled in multiple passes to a final thickness of 1mm (80% reduction with a true strain of 1.6). Effect of annealing time and temperature on hardness has been studied and it has been found that a short annealing at 275 C for 15min after cryorolling would yield a good combination of strength and ductility. 2 P a g e
Microstructural characterization using optical metallography, SEM, EDX, TEM, XRD and EBSD showed the grain size after cryorolloing to be around and a bimodal grain structure after annealing which is responsible for better mechanical properties than cold rolled sheets. Forming limit diagrams have been determined experimentally using standard punch stretching tests and the limit strains of cryorolled sheets have been found to be equal to conventional cold rolled and annealed sheets in all modes of deformation
(biaxial tension, plane strain and tension-compression). No major differences have been found in strain distribution either in the tested samples. This work clearly demonstrates that cryorolling of AA5083 alloy sheets followed by a short annealing treatment with bimodal grain structure can be used for sheet metal forming applications to produce parts with higher strength and toughness than conventional sheets without any reduction in formability.
In this research, an attempt has been made to enhance formability of cryorolled AA5083 alloy sheets (annealed at 275 C for 15min) in deep drawing of the flat bottom square cup shaped parts by hydroforming. Numerical simulations based on finite element method have been carried out to study the effect of important process parameters (fluid pressure and sealing force) on formability. The minimum corner radius and the maximum depth that can be achieved without failure and the maximum percentage thinning at the corners have been considered as measures of formability. The results have been compared with conventional deep drawing. The simulation results have also been validated with experimental work in both hydroforming and conventional forming. A process window with an optimum combination of peak sealing force and peak pressure has been identified to form the cups up to full depth of the die without failure at die entry or bottom corners. Lubrication between the die and the blank reduced the minimum possible corner radius to nearly 16mm with thinning less than 6%. In conventional forming only 70% of the full depth could be obtained before failure with 16mm punch corner radius due to much higher thinning at the corners. This work demonstrates that, by hydroforming, formability of high strength cryorolled Al alloy sheets can be enhanced due to lower thinning and more uniform strain distribution and hence this process route (cryorolling followed by hydroforming) is a potential technique to produce complex parts from lightweight high strength Al alloy sheets due to enhanced formability. 4. Education Background:
2012–2017 Department of Mechanical Engineering
Indian Institute of Technology Delhi
Delhi, India.
Ph.D. in Mechanical Engineering entitled with “Hydroforming of Cryorolled Aluminum Alloys”
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2009 – 2010 Department of Mechanical Engineering
Addis Ababa University (Addis Ababa Institute of Technology) Addis Ababa, Ethiopia
Master of Technology (M. Tech) in Manufacturing Engineering in July 2010
(Great Distinction)
2004 – 2008 School of Mechanical, Chemical and Materials Engineering Adama Science and Technology University, Ethiopia
Bachelor of Science (B.Sc.) in Manufacturing Engineering in July 2008
(Great Distinction)
2000–2003 Department of Metal Technology
Menschen für Menschen Agro-technical Training College (ATTC), Ethiopia Advanced Diploma in Metal Technology in July 2003.
(Great Distinction)
5. Work Experience
I worked as a general technician in SINTECH Ethiopia Plc. in the department of engineering for fabrication, erection, rehabilitation, design and maintenance in Addis Ababa, Ethiopia from October 2003 to March 2004. During the time, I have participated on the erection of machine, I developed jig and fixture for transport conveyor for Metabo Beer Factory, welding, fitting, machining and in sheet metal development section for part manufacturing like for smoke chamber, chimney pipe etc. Since then I got a scholarship for an undergraduate degree program at ASTU University. When I was a student in ASTU, working on a technical assistance ship on the Department of Mechanical Engineering in Adama Science and Technology University, Ethiopia from 2004 to July 2008. Throughout the time, I was an assistant for undergraduate mechanical engineering students to show and to demonstrate NC lathe, CNC milling, NC grinding, SMAW, TIG, MIG, resistance arc welding, submerged arc welding, tensile testing and so on.
After graduating my first degree I had a scholarship for master degree in one of our top university ‘Addis Ababa University’ and jointly with Indian Institute of Technology. I was also a lecturer in the Department of Mechanical Engineering in Adama Science and Technology University till to July 2012. During this time, I taught different subjects in Mechanical Engineering Department. In addition to these, I have advised undergraduate and graduate students on their final year project. Also, I was an invited lecturer in Ethiopian 4 P a g e
sugar corporation and research development center since 2009 to 2012. During this time I taught a subject like Gear Manufacturing, Sheet metal development, Machining and Welding. Also, I was an assessor for Ethiopian technician’s center of excellence for quality and exam coordinator for excellence. Since July 2012, Ethiopian Ministry of Education gave me a full scholarship for my Ph.D. degree in India and I have joined Indian Institute of Technology Delhi to pursue Ph.D. in Mechanical Engineering Department under the supervision of Prof. D Ravi Kumar. Besides pursuing Ph.D. degree, I have been doing as a teaching assistantship for undergraduate and postgraduate students in Mechanical Engineering Department. Also, I have provided practical and tutorial classes. 6. Recent Experimental Work Achievements and Contributions in Indian Institute of Technology Delhi, India
During my Ph.D. program, my research team developed the following experimental set up in order to study high strength and lightweight metals. Also to enhance formability through non-conventional forming processes.
a. Cryorolling and Constrained Groove Pressing experimental setup for improving the mechanical properties of aluminum alloys
b. Bulging test, sheet hydroforming and warm forming to study the formability of aluminum alloys and extra low carbon steel (tailor welded blank) 7. Research Interests
My main research interests are in the field of:
Sheet metal forming and its application for the automobile industry
Enhancing the strength of lightweight metals by severe plastic deformation processes, characterization and its structural application.
Finite element modeling, simulation and process optimization.
Miniaturization and studying complex geometry feature of parts in the field of automotive and aerospace industry.
Scaling effects in sheet metal forming.
Selection and characterization of biocompatible material for the medical application and
Modern manufacturing, additive manufacturing, characterization of composite materials and its applications.
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8. Current Position
Pursuing Ph.D. in Mechanical Engineering Department, in Indian Institute of Technology Delhi
(http://www.iitd.ac.in/), New Delhi, India under the supervision of Prof. D Ravi Kumar. My thesis title is
“Hydroforming of Cryorolled Aluminum Alloys” My Ph.D. will internally clear soon and thesis will be submitted in November 2017.
9. List of Publications
Articles
Fitusm Feyissa, D Raja Satish and D Ravi Kumar “Cryorolling and Warm Forming of AA6061 Aluminium Alloy Sheets” Materials and Manufacturing Processes, 2017, VOL. 32, NO. 12, 1345–1352. Doi.org/10.1080/10426914.2017.1317352.
Fitsum Feyissa, D Raja Satish, and D Ravi Kumar “Formability of Cryorolled Aluminum Alloy Sheets in Warm Forming” International Journal of Materials, Mechanics and Manufacturing, In press. 2017. Doi: 10.18178/ijmmm.2018.6.2.360.
Fitsum Fleyissa and D Ravi Kumar “Characterization of Microstructure, Mechanical Properties and Formability of Cryorolled AA5083 Alloy Sheets” Journal of Materials Engineering and Performance, 2017. Under review
Fitsum Feyissa and D Ravi Kumar “Enhancement of Formability of Cryorolled AA5083 Alloy Sheets by Hydroforming” Journal of Materials Research and Technology, 2017. Under review
Fitsum Feyissa and D Ravi Kumar “Microstructure, Mechanical and Post-Formability Study Of Conventional Deep Drawing and Hydroforming of Cryorolled AA5083 Alloy Sheets”, 2017. To be communicated.
Fitsum Feyissa and D Ravi Kumar “Effect of anisotropy and pressure path in hydroforming for Deep drawing of high strength Al-alloy sheets”, 2017. To be communicated
Fitsum Feyissa and D Ravi Kumar “Influences of Study of Constant and Variable Blank Holding Force Techniques in Hydroforming of Cryorolled Al-Mg Alloy Sheets”, 2017. To communicate
Fitsum Feyissa and D Ravi Kumar “Influence Of Blank Size Optimization and Different Punch Corner Radii in Conventional Deep Drawing of Cryorolled AA5083 Alloy Sheets”, 2017. To communicate.
Fitsum Feyissa and D Ravi Kumar “Influence of friction and lubrication on formability of cryorolled AA5083 alloy sheets in the conventional deep drawing of cryorolled AA5083 alloy sheets”, 2017. To communicate.
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International Conferences
Fitsum Feyissa1, Purnendu Das, D.Ravi Kumar and B.Ravi Sankar, “Characterization of Mechanical Properties and Formability of Cyorolled Aluminium Alloy Sheets,” 5th International & 26th All India Manufacturing Technology, Design, and Research Conference
(AIMTDR 2014) IIT Guwahati, 2014.
Fitsum Feyissa1 and D. Ravi Kumar “Numerical Simulation of Conventional Forming and Hydroforming of Square Cups using Cryorolled AA5083 Alloy Sheets,” 17th ISME Conference on Advanced Mechanical Engineering, IIT Delhi, 2015.
Fitsum Feyissa1 and D. Ravi Kumar “Numerical Simulation and Experimental Validation of Punchless Hydroforming of Square Cups using Cryorolled Aluminum Alloy Sheets,” ASM International, MS&T16 USA, 2016.
Fitsum Feyissa1, D Raja Satish, and D Ravi Kumar “Formability of Cryorolled Aluminum Alloy Sheets in Warm Forming” International Conference on Manufacturing Technologies ICMT 2017, USA, 2017.
Fitsum Feyissa2 and D. Ravi Kumar “Study of Constant and Variable Blank Holding Force Techniques in Hydroforming of Cryorolled Al-Mg Alloy Sheets by FE Simulation,” accepted in TMS 2018 147th Annual Meeting and Exhibition USA, 2018. 10. Technical Skills
Confident in use of various software packages such as:
CAD software: AutoCAD, Solidworks, IDEAS
CAD/CAM software: Master-CAM
Analysis software: DYNAFORM-LsDYNA, SIMUFACT forming and DEFORM
Data acquisition and analysis software: LabView, Origin
Programming software: Matlab, C++,
Microsoft Office: Word, Excel, PowerPoint
11. Communication Skills
I have worked closely with the range of undergraduate and postgraduate students, research colleagues, department staffs and external contacts. I have made several presentations in my academic research area and general topics to non-specialist audiences too. 7 P a g e
In general, I have sufficient communication skills using the following languages:
Amharic (mother tongue),
English (fluent) and
Oromo (good)
Note that: The English language has been medium of instruction for all awards such as Certificates, Adv. Diploma, BSc. MSc. and Ph.D.
I had professional International presentations:
Oral presentation at International Conference on All India Manufacturing Technology, Design and Research, 2014, India
Oral presentation at International Conference on Material Science and Technology, under Symposium of Advanced Light Metal Technology, 2016, USA
Oral presentation at International Conference on Material Science and Technology, under Symposium of Advanced Manufacturing Technology, 2016, USA. I did professional oral National presentations:
Oral presentation in Ethiopian Society of Mechanical Engineering Conference ESME on Manufacturing and Mechanical Engineering, 2008, Ethiopia.
Oral presentation in Indian Society of Mechanical Engineering Conference, ISME on Advanced Mechanical Engineering, IIT Delhi, 2015, India.
I have done oral International presentations related social activity:
Oral presentation in World Organization of Student & Youth, Indian-African Youth Summit WOSY, in October 2015, India
Oral presentation for the African Union organized by World Organization of Student & Youth in May 2016, India
Oral presentation in 4th International Cultural Congress for peace at Aster Public School Uttar Pradesh, in April 2016, India
Oral presentation in 5th International Cultural Congress for peace at Aster Public School Uttar Pradesh, in April 2017, India
12. Membership
Ethiopian Society of Mechanical Engineer
Indian Society of Mechanical Engineer
Center of Competency in Ethiopia
Ethiopian Red Cross Society
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13. Certification and Award
Certificate in ‘CNC, PLC, & logical actuator’ on March 2008, at Defense Engineering College Bishoftu, Ethiopia.
Best project award among all BSc. graduates students in Mechanical Engineering classes of years 2007-2008, Ethiopia.
Certificate in ‘Competency assessor’s course’ in April 2009 at Oromiya Center of Competency, Ethiopia.
Certificate in ‘Salesmanship for Engineers’ on 26 June 2010 in Ethiopian Society of Mechanical Engineers, Ethiopia.
Certificate in ‘Finance for non-finance Management for engineer’s in June 2010 from Ethiopian Society of Mechanical Engineers, Ethiopia.
Certificate in ‘Intensive English Language Training’ in September 2010 in Helping education Loretta project, Ethiopia.
Certificate in ‘Occupational Safety and Health’ in July 2011 from Ethiopian Society of Mechanical Engineers, Ethiopia.
Certificate in ‘Hydraulic circuit designing’ in August 2011 from Adama Science and Technology University, Ethiopia.
Certificate in ‘Teaching Profession’ in October 2011 from Adama Science and Technology, University, Ethiopia.
Certification of participation in ‘Workshop on SEM and EDX ’in September 2014 at SEM central facility, Indian Institute of Technology, India.
Certificate in ‘Bringing the Nanoworld Together’ in November 2014 from IIT Delhi, India.
Certificate in ‘Web Development’ in February 2014 from Sec System Annual Technical festival of Indian Institute of Technology, India.
Certefication of participation on India International Science Festival (IISF-2015), Govt. of India, New Delhi, India, 4-8 December 2015.
Certification of participation in ‘Indian-African Youth Summit’ World Organization of Students
& Youth October 2015, India.
Peace Messenger Awards and Certificates from Help Brainz ‘4th & 5th International Cultural Congress for peace’ April 2015 and 2016, India.
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14. Hobbies
I am enjoying by Watching TV shows, Traveling, Exercise (Running, Martial-Arts, Gyms fitness) and Praying in the Church.
15. Professional References
Prof. D. Ravi Kumar (Supervisor)
Department of Mechanical Engineering
Indian Institute of Technology Delhi
New Delhi, India.
Tel: (O): +91-11-265*-****
Email: *****@****.****.**.**
Prof. P. V. M. Rao (SRC member)
Department of Mechanical Engineering
Indian Institute of Technology Delhi
New Delhi, India.
Tel: (O): +91-11-265*-****
Mob: +91-98-713*-****
Email: ******@****.****.**.**
Dr. Hariharan, K
Department of Mechanical Engineering
Indian Institute of Technology Madras,
India
Prof. Sunil Pandey
Department of Mechanical Engineering
Indian Institute of Technology Delhi
New Delhi, India.
Tel: +91-11- 26591587
Mob: +91-98-681*****
Email: *******@****.****.**.**,
Prof. Chanyalew Taye Belachew
Department of Mechanical Engineering
The University of Texas at Tyler, USA.
Engineering Center
2811 Hayes Rd, Houston, TX 77082
Phone: +1-903-***-****
Email: **************@*******.***
Web: www.uttyler.edu
Tel: (O): +91-44-225*-***
Email: *********@****.**.**
Contact this candidate