Resume - Fatigue Fracture FEA Vibrations Engineer

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Resume #81799

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I work at Cessna Aircraft Company as a Durability & Damage Tolerance (DADT) engineer. I hold a MSME (2003) from the University of Oklahoma, Norman campus and continued thereafter to pursue a PhDME also at OU. I plan to graduate with my PhD in the Summer 2009.

I seek independent as well as team analyst/engineer/researcher positions on a permanent basis in engineering firms that offer challenging tasks and exciting career opportunities.

I worked as an Assembly Engineer at the Rear Axle and Differential unit, Kirloskar Systems Limited (Bangalore, India) for a year before enrolling at OU. My master's thesis is an experimental study on slow crack growth and fracture strength characteristics of thin sheet aluminum alloys with and without corrosion damage. I also worked in a mini-project to experimentally investigate the fatigue performance (includes static tension, fatigue crack growth rate, and high cycle fatigue life tests) of AA 7055-T76 (recently introduced by Alcoa) and AA 7075-T6 in moist and dry air conditions for material substitution studies. I am also conversant with theory and experimental procedure involving low cycle fatigue tests, and familiar with post fracture micro probe analysis.

I am skilled in using Ansys (Classic and Workbench with APDL experience) and have worked as Ansys lab assistant for 3 years at OU, and assisted students in using Ansys for their class and capstone projects. I am also skilled in Catia (Part & Sketcher), 3DCOM, Pro/E Wildfire (Mechanica, Mfg., Drawing, etc), Mathematica (Wolfram certified Advanced Foundations Level User), FEMAP, Sigma Plot, Fortran, and Adams.

My doctoral research is focused on the dynamic behavior of bridge structures under moving loads and masses using Differential Quadrature Method (DQM). Upon completion of my PhD program, I hope to offer myself as a multifaceted engineer with a blend of knowledge on structural dynamics, fatigue and fracture mechanics concepts, few popular numerical methods, and with a readiness to conduct experimental procedures as and when required.

I take this opportunity to invite you to look at my resume for a matching position and will be very happy to discuss with you upon further consideration. Thank you.

OBJECTIVE: Benefit company using experience gained in Fatigue/Fracture Mechanics, Structural Dynamics, FEM

EDUCATION
PhD in Mechanical Engineering from University of Oklahoma, Norman Campus, SUMM'09 (expected), GPA 3.7/4.00
MS in Mechanical Engineering from University of Oklahoma, Norman Campus, SPR' 03, GPA 3.67/4.00
BS in Mechanical Engineering from National Institute of Technology, Kurukshetra University, India, May 1997, first class

PROFESSIONAL EXPERIENCE: 1 YEAR AND 6 MONTHS
Oct'08 – Mar'09: Durability & Damage Tolerance Engineer at Cessna Aircraft (A Textron Company), Wichita, USA; Tasks included Damage tolerance studies on stiffened panels with debond effects, released Cessna report S-162-920 V1 and V2 instrumentation documentation for Light Sport Aircraft (LSA)
Jan'98 – Dec'98: Assembly Engineer in the Rear Axle and Differential Unit at Kirloskar Systems Limited, Bangalore, India; Duties included implementing design changes in the fixtures used, maintaining inventory database for assembly equipments, machineries, conversion of hardcopy version of assembly layouts obtained from Toyota Motors Corporation, Japan into softcopy (AutoCAD) and modifications needed for setting up an auto-ancillary unit at Bangalore, India

INTERNSHIP PROGRAMS
University of Oklahoma: Student Assistant in Multimedia assisting faculty in course content development, SUMMER 01
Hindustan Aeronautics Limited (HAL), Bangalore, India, Trainee, Engine Division, SUMMER 96
Hindustan Motors Earthmoving Equipments Division (HM-EED), Tiruvallur, India, In-plant Trainee, SUMMER 95

RESEARCH EXPERIENCE: 7 YEARS
Graduate Research/Teaching Assistant, FALL'00 – SPR'08, AME, University of Oklahoma.
Thesis Title for MSME program: Fracture strength of aluminum panels with corrosion damage (work completed)
Research Areas for PhD program: Dynamic behavior of bridge structures under moving masses (work on progress)

SOFTWARE SKILLS
Advanced level ANSYS user (Classic/Workbench and APDL) with adequate exposure to theoretical stress analysis
Skilled in Catia Part & Sketcher, Pro/E modules, FEMAP (pre/post with Nastran solver), 3DCOM, Fortran
Adequate experience in using MTS software (Test Star II) for Material Testing, and in handling CNC mill codes
Mathematica: Wolfram Certified Advanced Foundations Level user of Mathematica (May 2008)
Other: Adams (View/Flex modules), Sigma Plot, I-deas, Mat Lab, C/C++ and exposure to working in Linux and Mac OS

CONFERENCES/PRESENTATIONS
Graduate Student Research & Creativity Poster Presentation, University of Oklahoma, April 2007
9th International Fatigue Congress, Atlanta, Georgia, May 2006 (presented 2 papers)
Aging Aircraft 8th Joint NASA/FAA/DoD Conference, Palm Springs, California, February 2005 (1 paper)
23rd and 26th AIAA/ASME Oklahoma Regional Conferences, Norman, Oklahoma, March 2003 and April 2006 (1 paper)

PROJECTS
Material Substitutions in Aging Aircraft: Evaluation of AA 7055-T76 as a substitute for AA 7075-T6 (externally sponsored)
Structural Optimization of a Ten Bar Truss System using FEMB/GENESIS, ANSYS
Bending of Circular Plates with Thickness Variation
Design and Manufacturing of Automotive Door Hinges using Pro/Mechanica and Pro/Mfg

ACTIVITIES
Voluntary Member for Academic Misconduct Hearing Panel, SPR'06, FALL'04-SPR'05
Editorial Committee Member of OU ACCENTS- A Magazine for OU Students, FALL'04-SPR'05
Graduate Student Senate member: FALL'03-SPR'04 (Ways & Means), FALL'00 – SPR'01 (Academic Affairs Committee)
Served Captain of College Chess Team, REC Kurukshetra, for the term 1996-97

AFFILIATIONS
Student Member of Golden Key, an International Honor Society 2007-08
Student Member of Pi Tau Sigma (2001-02 and 2003-04), Gamma Beta Phi, (2005-06) and ASME (2003-08)

1. MS Thesis: Fracture Strength of Aluminum Panels with Corrosion Damage – 2003.

This is an experimental program targeted at evaluating the mode I, plane-stress fracture strength (Kc) of T-L oriented high strength AA 7075-T6 and AA 2024-T3 sheets. The specimens used were of center-crack tension (CCT) – also called as middle tension (M(T)) – configuration measuring 4" W x 12" L x (0.040", 0.063", 0.090") B with center notches as per ASTM E 561 as well as tapped holes for holding clip gages to record crack opening displacement (COD). Both plastic-zone as well as compliance methods were applied to develop crack growth resistance curves (R-curves) to compute fracture strength of the panels. Both baseline (non-corroded) as well as corroded panels were included in the program so as to ascertain the impact of corrosion damage on the fracture properties of these alloy sheets. Residual strength characteristics of these cracked sheets were also covered and compared with the past research works.

This study gave me a good understanding about fracture behavior of thin sheet alloys, and damage tolerance methods and available experimental techniques. This research effort has been partially supported by the Air Force Office of Scientific Research.

2. Mini Project: Experimental Characterization of Al 7055-T76 as a Candidate Substitute Material for Aging Aircraft - 2005.

The primary objective of this study is to evaluate the fatigue performance of the candidate substitute material 7055-T76 relative to 7075-T6. The program involved conducting a series of static coupon tensile tests and constant amplitude fatigue crack growth rate (FCGR) tests as well as fatigue life estimation tests on 7075-T6 and 7055-T76 sheets. While ASTM standards E 647 was followed for the FCGR tests, the fatigue life estimation tests were carried out on the AGARD guidelines except that the effects of corrosion damage on fatigue life were not addressed. However for the FCGR tests, both baseline and corroded panels were tested and the corrosion methods included both ASTM G 34 EXCO method as well as Alcoa's ANCIT method. In addition, environmental effects on fatigue crack growth rate were also covered by testing the specimens in dry (RH < 15%) and moist (RH > 85%) air conditions. Fatigue life estimation tests were carried out at laboratory air conditions (RH ~ 50%). Test results show similar performance of 7055-T76 and 7075-T6 on the basis of tensile and fatigue properties and highlight the improved corrosion resistance of 7055-T76. Statistical comparisons were made between baseline and corroded panels of same material type tested at similar test conditions (i.e., combinations of Stress ratio R = 0.05, 0.50 and Relative Humidity RH < 15%, RH > 85%) as well as baseline specimens of 7075-T6 and 7055-T76 at RH < 15% only since both the material type behaved similarly at dry air conditions.

This is a joint work study carried out by Mr. Pratyush Kumar and myself, under the supervision of Dr. Baldwin who is our thesis advisor, and Principal Investigator of this project. This project is sponsored by S & K Technologies.

I also supervised/assisted colleague who was working on low cycle fatigue life characteristics of aluminum alloy 2024-T3. And I started my PhD with crack nucleation phenomenon in aluminum alloys but later had to divert my attention as I had little progress in it due to 1) lack of knowledge in metallurgical aspects, and problems encountered with the specimen set up when using electron probe micro analyzer, and 2) the project objective which was to use thin copper film embedded to specimen surface (in this case a rectangular specimen or say M(T) specimen with no crack) as a crack initiation sensor is not materializing – the thin copper foil has to be cut like a thread (or using deposition technique similar to strain gage film) which we didn't have enough resources to produce and too costly to buy from commercial suppliers for custom designs.

After discussing with my Professor, I shifted my focus to this interesting subject bridge-vehicle interaction phenomenon, and OU is actively engaged in developing an intelligent vehicle bridge system (IVBS), and I joined the Dynamic Structures Sensing & Control (DySSC) center as a modeling and simulation team member.

3. PhD Thesis: Dynamic behavior of bridge structures under moving loads and masses

My PhD thesis is a numerical study on the dynamic behavior of highway bridge structures under moving vehicular loads. This study extends the application of one of the recently introduced numerical approximation technique called Differential Quadrature Method (DQM) to solve for transient dynamic problems. I implemented the numerical procedure for moving load analysis using Mathematica code, and developed beam and plate models to study the effect of moving forces (no inertia effects), masses (inertia effects included – interaction effects neglected), and oscillators (both inertia and vehicle interaction effects included). Mathematica codes for single and two axle load systems were developed, and the effects of parameters on vehicle to bridge interaction (VBI) phenomenon were studied. I also used Ansys to study the dynamic behavior of a beam and plate under moving loads for demonstration purposes. I plan to defend my thesis in the Summer 2009.

This study is a part of the extensive research work carried by the DySSC team at OU with key objectives to design and implement an intelligent vehicle bridge system (IVBS) for effective monitoring and control of vibration effects of vehicles on highway bridge structures. This work is funded by both the School of AME and DySSC center at OU.

I also joined with other DySSC team members to participate in the installation of accelerometers in vehicles and bridges, and subsequent testing at both the four post Vehicle Test System (vehicle shaker from MTS), and at test sites – bridge and highway roads. I learned some aspects of bridge monitoring techniques as well as vehicle to bridge communication procedures that enable monitoring and control of systems.

Other Details:

Status: F-1 visa (presently on my OPT – with a valid EAD work authorization). I am eligible to apply under special category (20000) H1B for higher degree professionals (MSME earned in USA) and as well as qualify for a 17 month OPT extension.

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