Mechanical Engineering

Chenzhi Wang

Address: **** ********* ** *** **, Pittsburgh, PA 15217

Email: ************@*****.*** Phone: 412-***-****

QUALIFICATIONS

Working knowledge of 3D drawing software: Catia V5, Solid works, AutoCAD 2D engineering drawing

Working knowledge of part design for performance, durability, cost-effective, manufacturing

Working knowledge of Finite Element Analysis (FEA) & CAE: ANSYS, Abaqus, Radioss, LS-Dyna

Working knowledge of FEA/CFD meshing/preprocessing tools: Hypermesh, ICEM-CFD

Working knowledge of mechanical design principals, solid mechanics, strength of materials, multi-body

dynamics, shock and vibration, biomechanics, thermal analysis, fluid dynamics

Working knowledge of stress analysis, failure root cause, fatigue analysis, damage tolerance a nalysis

Working knowledge of material constitutive models, implement nonlinear materials for FEA

Working knowledge of mechanical test protocol design, bench test, and test results data analysis

Hands-on experience in mechanical strength test and product durability test to find fatigue fracture

Proficient in programming: Fortran, MATLAB, ability to code material Fortran subroutine in Ansys

EDUCATION

Ph.D. in Mechanical Engineering, 09/2013

University of Pittsburgh, Pittsburgh PA

Master of Engineering in Vehicle Engineering, 07/2008

Nanjing University of Science and Technology, P.R. China

Bachelor of Engineering in Mechanical Engineering & Automation, 06/2006

Nanjing University of Science and Technology, P.R. China

EXPERIENCE

University of Pittsburgh, 09/2008 - 09/2013, Research Assistant

Nanjing University of Science and Technology, China, 09/2006-07/2008, Research Assistant

Nantong Maolian Aluminium Alloy Technology Co., Ltd., China, 08/2007-01/2008, Engineering Internship

PROJECTS

Finite Element Based Design Improvement of a Light Truck Cab to Optimize Rollover Crashworthiness

• The Catia V5 CAD truck model is imported into HyperMesh for geometry clean-up and simplification

• Mesh CAD to a full truck crash model to have quadrilateral elements (97%) and triangular elements (3%)

• W elding spots are modeled by spring-beam elements; rivets and bolts are modeled by rigid elements

• In RADIOSS, LAW 36 elastic-plastic piecewise linear material is chosen for metals under various strain

rates, for windshield, LAW 27 elastic plastic brittle material is used, ultimate strain of welding spots is 0.75

• The finite element crash model is verified by simulating against real cab modal test and frontal impact test

• Front pillar impact and roof strength impact tests are simulated to get cab deformations and energy curves

• A 50th percentile male dummy CAD model is designed in Catia V5 to examine human collision with cab

• Cab structural improvements are designed such as filling structural foam in the A-pillars and the side panels,

adding a roof crossbeam, and reinforcing the rear wall of cab using Catia V5

• The simulations of new design show that the cab stiffness is promoted, A-pillar is not crashed, crash energy

absorption is more homogeneous, and occupant survival space is large enough

Finite Element Modeling of Blast-Induced Traumatic Brain Injury (PhD Dissertation)

• CAD of dummy head (scalp, skull, cerebral spinal fluid, brain, cavity) is reconstructed from MRI in MIMICS

• Build FEA model from CAD in ICEM-CFD: clean geometry, meshing, check mesh quality, adjust mesh

• Material modeling: bulk modulus, shear modulus, equation of state, viscoelastic modulus, etc.

• Validate FEA model by comparing crash simulation with cadaver crash experiment in ANSYS AUTODYN

• Simulate dummy head under blast wave from front direction in LS -Dyna and AUTODYN to compare them

• Simulate dummy head under blast loadings from front, lateral, rear directions in ANSYS AUTODYN

• Reveal injury severities based on brain pressures at various locations for blast intensities and directions

• Derive mathematical pressure-radius (P-r) expression of cerebral vein under inner inflating fluid pressure

and fixed in-vivo extension ratio using hyperelastic constitutive model reinforced by two families of fibers

• Extend and inflate fluid into cerebral vein samples in designed pressure range to record the P-r histories

• Program mathematical model of cerebral vein inflation-extension tests for material data fitting in MATLAB

• Obtain mechanical properties of vein by fitting test results to mathematical model using nonlinear regression

• Modeling of cerebral vein using the obtained anisotropic hyperelastic material properties in ANSYS APDL

• Apply cerebral pressures as external loadings on internal vascular walls of human cerebral vein FEA model

• Compare axial Cauchy stress of bridging vein with corresponding yielding criteria to predict vein injury

Design Validation and Thermal Stress Analysis of Active Combustion Throttling Valve

• According to the requirement of control engineer, draft the CAD of the valve body in SolidWorks

• Mesh CAD model of valve to solid hexahedral mesh with quality, material properties assignment in ANSYS

• Determine boundary conditions: internal high pressure, internal high temperature, movement constraints

• Executed FEA, post-processing to evaluate stresses/ thermal expansions, check local stress concentrations

• Validate its reliability by comparing von Mises stress with industrial criteria, revise design for cost-effective

Cooling Ability Validation of a Novel Thermo-Acoustic Refrigerator Using Heat Transfer FEA

• The thermo-acoustic refrigerator is built on a tank filled with water. Tank is cooled continually at one end

• Transfer CAD model of tank from Solid Works to ANSYS Workbench, build fine hexahedral FE mesh

• Assign thermal conductivity, assign constant lower temperature at cooling end ; assign ambient temperature

by simplified convection of stagnant air at other surface area in ANSYS Mechanical

• Post-processing in ANSYS Mechanical to evaluate temperature and heat flux distribution, heat flux vectors

• Cooling ability of refrigerator is evaluated by heat flux through the cross section of tank

Fatigue Analysis of Aluminum Alloy Vehicle Wheels under Cyclic Rotary Loading (MS Thesis)

• Hands-on fatigue experiments on auto wheel in a cooperative factory plant to check fracture

• Built clamp and shaft model, meshed assembly of wheel, clamp, and shaft in Abaqus

• Applied radial loadings on wheel in sequence with interval of 22.5 to simulate working loads

• Get maximum and minimum von-Mises stresses at dangerous areas to calculate equivalent cyclic stresses

• Comparing component S-N curve with calculated equivalent cyclic stresses to predict fatigue life

• If fatigue life is short, strengthen weak area in CAD; if fatigue life is too long, revise CAD to reduce costs

OTHER SKILLS

• Strong skills in MS Word, Excel, PowerPoint, good presentation skills and writing skills

• Fluent in both verbal and writing English, native Chinese speaker, can travel internationally

• Good physical strength, experience in moving heavy automotive components for impact and fatigue testing

in a manufacturing company, able to work outdoor

Contact this candidate