Project Mechanical
Resume:
AASHISH NAHAR RAJENDRA KUMAR NAHAR
Wichita, Kansas, 67208
acwh15@r.postjobfree.com
OBJECTIVE
To obtain a Challenging Structural Design/Stress/Test engineer position in the field of Aerospace/Mechanical/Automobile Engineering
EDUCATION
WICHITA STATE UNIVERSITY, WICHITA, KS May 2016
Masters Of Science, Aerospace Engineering CGPA: 3.85/4.0
HINDUSTAN INSTITUTE OF TECHNOLOGY, CHENNAI, TAMILNADU May 2013
Bachelor Of Engineering, Aeronautical CGPA: 8.8/10
ACADEMIC PROJECTS
Thesis [Compression-Compression Fatigue on Carbon/Epoxy cross-ply laminate with embedded sensor tube]
Mechanical Property Characterization of Paraffin Wax Hybrid Rocket Fuel. Discovered mechanical properties by performing various tests in a team environment. Performed various tests such as, Tensile and Shores hardness. Compared properties with different compositions of reinforcement, like Aluminum, Carbon and Ammonium Phosphate.
Aircraft Design Project
WORK EXPERIENCE
Graduate Research Assistant, Wichita State University
Projects:
1.Analyze the Mode-I Fracture Toughness of the advanced composite system
(KART and NASA Projects) January 2014 to July 2014
It involves data reduction to analyze the effect of fiber reinforcement architecture with same resin system on the fracture toughness. Also, Strain gauging to the test coupons to analyze the gauge region of the specimen subjected to the axial loading.
Designed MTS test fixture (Loading nose) for mode-1 fracture toughness testing based on the testing requirements using Solidworks.
2.Analyze the Mode-II Fracture Toughness of the advanced composite system
(KART Project) May 2014 to July 2014
It involves data reduction to analyze the effect of fiber reinforcement architecture with same resin system on the fracture toughness. Also, Strain gauging to the test coupons to analyze the gauge region of the specimen subjected to the axial loading.
Used Aramis (an alternative to strain gages) software and methodology – a non-contact approach to measure strains (DIC- digital image correlation).
3.Mechanical Property characterization of Advanced Composite Materials
(KART Project) May 2014 to December 2015
Tension test of Unidirectional and 8HS carbon fiber prepregs and 5320 epoxy resin system with embedded sensor tube.
CLC Compression test of Unidirectional and 8HS carbon fiber prepregs and 5320 epoxy resin system with embedded sensor tube.
3-Point Test of 8HS carbon fiber prepregs and 5320 epoxy resin system with and without embedded sensor tube.
All are ASTM standard tests.
4.Technical Writing
(KART Project) May 2014 to July 2014
August 2015 to December 2015
Kart-1 Report (Involving documentation of mechanical test results and comparison with literature)
Kart-2 Report (Involving documentation of fatigue test results and comparison with literature and analyzing FEA results)
5.Thesis – Effect of Embedding cylindrical sensor tube on compression fatigue life of cross-ply laminate (KART Project) March 2015 to May 2016
Composite laminate fabrication, involving planning of lay-up procedure, executing the plans and finally ASTM D6641 coupons from oven/autoclave cured laminates.
Involving planning Non-standard test, using ASTM D6641 coupons and CLC fixture to carry-out Compression Fatigue experiments of cross-ply laminate.
Microscopy using Infinity capture 2.0, to aid in determining compression failure modes.
FEA using MSC Marc to model plane stress CLC specimen with embedded sensor tube to perform non-linear implicit finite element analysis, to see the stress concentrations induced around the inclusion under compressive loads and similar models with varying boundary conditions.
FEA invovling composite laminate delamination ply-by-ply failure analysis, using failure criterions such as Tsai-wu, Tsai-hill, Hashin Rotem.
Performed linear elastic FEA to aid in determining failure modes under compression-compression fatigue observed in the ASTM D6641 experiments.
Also involving a year of research for Literature Review.
Report (documentation of experimental results, literature and analyzing FEA results to determine the final conclusion of the report)
Calculation of ply stresses using classical laminate theory by hand to compare with FEA results and aid in the failure analysis.
6.Non – KART Projects January 2015 to May 2016
Mechanical Testing of Al 7650 for university structures lab class.
Mechanical Testing of balsa and foam for final year student projects.
Designing wing box to replicate an actual wing of an aircraft, but with challenge of high strength to weight ratio.
Strain gaging composite, metals and other materials for strain measurements.
DMA and TMA used to study the properties of various carbon fiber pre-pregs
resin system under compression, 3 point bend, tension and penetration in both
isothermal and dynamic conditions (heating and cooling) with inert gas N2.
TGA and DSC for studying thermal characteristics of resin and determine
glass transition temperature, recrystallization point and enthalpy.
All of the above projects involved hands-on experience of over two years with composite laminate fabrication, involving planning of lay-up procedure, executing the plans and finally ASTM coupons from oven/autoclave cured laminates.
Performing other ASTM tests using Electro-Mechanical and Servo-hydraulic MTS, such as, Tension, Combined Loading Compression, Rail-Shear, Short-Beam Shear, End loading Compression and suing Test works 4, MPT software and also Labview for stress and strain measurement data. Correlating Physical test data to FEA simulations.
7.Rheology
(KART Project) August 2015 to December 2015
To study the resin system of the carbon-fiber pre-preg.
Involving fabrication, testing and analyzing data.
8.Honeycomb physical property characterization
(Spirit Aero systems Project) August 2015 to December 2015
Characterizing Honeycomb via Microscopy and dimensioning the core using solid works, to aid in modelling the honeycomb core.
9.Age testing
(KART Project) January 2016 to present
To study the resin behavior used in plain weave fabric every two months in controlled environment.
Effect of out-time or aging on the mechanical properties of the resin.
Performing all of the ASTM tests on the plain weave fabric every two months.
Caddam Technologies Pvt Ltd, Chennai, TN, India
CAD/FEA CO-OP program, Jan 2011 – May 2013
Modelled components of compressor and assembled to analyze their kinematic behavior using CATIA V4. (Concept to design in 6 months to meet clients tight tolerance requirements)
Experience with projects involving drafting (use of GD&T), sheet metal and wire frame using Catia V4. (Turbo-Prop Exhaust Nozzle design, 2 years project)
Projects on PTC Wildfire 4.0, 3-D of modelling screws, nuts, bolts, hooks, blades, fish plates.
Projects on Ansys, 2-D truss, thermal analysis (ansys fluent), beam analysis (linear and non-linear analysis), Explicit dynamic analysis was a 2 year project which included a basic CAR crash and safety analysis at 90000mm/sec (worst case scenario) involving,
1.A car body (modelled using surface in Pro-E) with less stiffer material than the steel barrier used in this analysis.
2.A dummy model crash safety test with seat already pre-modelled by one of our clients (with and without seat belt).
3. Solution of stress, strain and deformation of the body. These final results were verified by comparing the internal and kinetic energy curves.
Also Impact analysis of cylinder with a composite plate to aid the CAI analysis.
Unigraphics for molds of mobile devices.
SKILLS
Computer skills: C, C++, AutoCad, Catia V4, Ansys (linear and non-linear static analysis, Explicit dynamic analysis), Uni-graphics, Abaqus, MSC Marc (Analyzing composites), Matlab, Hypermesh, Labview
Technical Skills: Drill press, Table saw, Lathe, Laser & Hot Wire Cutter, Soldering, Strain Gaging, CNC, Air quality measurement tool, Calorimeter.
ADDITIONAL SKILLS
Custom Templates in MS Excel to reduce the experimental Data.
Adobe Photoshop and Illustrator (Advanced, 5+ years)
Ableton Live 9 suite
ACTIVITIES
Design optimization, SAE Aero Modeling Competition, Hindustan Institute of Technology, 2009-2013 Duties: Shifting C.G of the model and optimizing the glider model.
CAD competition, Hindustan Institute of Technology, 2009-2013, Rotor Design using Catia V4
Software Skills
Level and Projects
C
Advanced
C++
Advanced (Object oriented)
AutoCad
Advanced ( Landing gear project)
Catia V4
2-D modelling, 3-D modelling, sheet metal, Kinematics (3+ years)
Test works 4, MPT (Multi Purpose Testware Software), Labview
Fatigue tests, static compression and various other ASTM based tests, Acquiring real test stress, strain and temperature data using lab view (2+ years)
Solidworks
MTS test fixtures (loading nose, Stud, 3-point bend test fixture), Characterizing Honeycomb, Laminate Schematics for ASTM coupons.(2+ years)
Ansys
2-D Liner elastic analysis (2+ years), Explicit dynamic analysis (crash analysis, Impact analysis)
Uni-graphics
Intermediate ( 2+ years)
Msc Marc
2-D plane stress analysis of CLC specimen to determine the Stress Concentrations induced around Sensor tube to determine the mode of failure under fatigue loading. [Orthotropic Materials (Composites), Isotropic (Metals) ]
Hypermesh and solvers like LS-Dyna, Opti-Struct, Radioss
Meshing Axi-symmetric Models i.e. ASTM Coupons for Dynamic anaylsis, to know the triaxial state of stress (2+ years), Verifying MIL-STD material models.
Matlab
Advanced (> 1 year)
Abaqus
3-D modelling and Non-linear analysis ( Buckling analysis, Three point bending) of Isotropic materials and othotropic (2+ years)
Sound Design ( Analog and Digital synthesizers)
< 6 months, Project on Sylenth.
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