Mechanical Engineering Engineer

SPECIALTIES AND SKILLS

* Analytical and numerical analysis for fracture mechanics

* Linear and nonlinear structural and thermal FEA simulations

* Wellbore stability and Poroelasticity

* ANSYS, ABAQUS, MATLAB, FORTRAN

EDUCATION

* Ph.D. Mechanical Engineering, University of Maine, Orono, Maine, May 2012

* M. S. Mechanical Engineering, East China Univ. of Sci. & Tech., Shanghai, China, June 2005

* B. S. Mechanical Engineering, Guangdong Ocean University, Guangdong, China, June 2001

RESEARCH EXPERIENCE

* Ph.D. 09/2006 - 05/2012, Department of Mechanical Engineering, University of Maine, Maine

Dissertation: Thermal fracture of homogeneous and functionally graded ceramics with multiple surface cracks

> Developed fracture mechanics models for cracked ceramics and functionally graded ceramics subjected to thermal shocks and mechanical loading

> Solved the thermal fracture problems semi-analytically for the fracture behaviors using the integral equation method

> Performed FEA to validate the developed models and methods

> Evaluated the effects of material property gradation and crack morphology on the thermal shock resistance and damage tolerance

> Provided recommendations for improving performace of engineering ceramcis

Project: Fracture Aperture for Wellbore Strengthening Application

> Performed detailed FEA to evaluate the aperture of two fractures of a wellbore in a shale formation subjected to a uniform wellbore pressure and remote in-situ stresses

> Derived an approximate, closed form solution for the crack mouth opening displacement (CMOD) based on a dimensional analysis and the superposition principle of linear elastic fracture mechanics

> Validated the obtained closed-form approximation by further finite element CMOD solutions to find the applicable range of the closed-form approximation

Project: Pore Pressure and Chemical Stresses around a Borehole in a Shale Formation

> Investigated pore pressure and stresses around a borehole in a chemo-thermo-poroelastic shale formation subjected to a uniform pressure of a chemically active drilling fluid.

> Obtained closed-form solutions and the corresponding asymptotic (nondimensional) short time solutions of solute concentration, pore pressure, and stresses using a coupled chemo-poroelastic theory

* M.S. 09/2002 - 06/2005, Department of Mechanical Engineering, East China University of Science and Technology, Shanghai, China

Thesis: Numerical Simulation of the Dynamic and Thermo-Stresses in Coke-Drum

> Developed various linear/nonlinear FEA models for stress, deformation and fatigue analysis of a coke-drum

> Conducted elastic and elasto-plastic FEA for both real operating conditions and proposed faster operating conditions using FEA software

> Provided recommendation for improving design, process procedure, and failure analysis of coke-drum

Projects: Stress Analysis of Laminated Composite Plates

> Developed higher order FEA models for the investigation of transverse shear stresses for laminated composite plates subjected to thermal loading

> Computed the numerical results by FEM (Fortran) based on the Reissner-Mindlin type globle displacement field and predictor-corrector method

> Validated the developed methods by comparing the results with a 3-D solutions

* B.S. 09/1997 - 06/2001, Mechanical Engineering, Guangdong Ocean University, Zhanjiang, Guangdong, China

Thesis: Design of Intermediate Frequency Quenching Machine for Spindle heat treatment

WORK EXPERIENCE

* Research Scientist, 07/2005 - 07/2006, East China University of Science and Technology, Shanghai, China

> Developed linear/nonlinear FEA simulations for structure, thermal, modal, fracture, creep and fatigue damage analysis

> Analyzed results and generated technical reports to the industrial companies

* Mechanical Engineer, 07/2001 - 08/2002, Henan Yingwei Dongfeng Machinery Co. Ltd, Nanyang, Henan, China

> Designed twin-screw press machines

> Performed structural and fatigue analysis for the material selection and structure optimization

> Provided technical support for costumers and sales

AWARDS

* Chase Distinguished Research Assistantship, University of Maine, 2009

* Outstanding Graduate Student, East China University of Science and Technology, 2005

* Outstanding Graduate Student, Guangdong Ocean University, 2001

PUBLICATIONS

* Journal Papers

1. Feng, Y. Z. and Jin, Z.-H., Thermal shock damage and residual strength behavior of a functionally graded plate with surface cracks of alternating lengths. Journal of Thermal Stresses, 2012, 35(1-3)

2. Feng, Y. Z. and Jin, Z.-H., Thermal fracture of functionally graded plate with parallel surface cracks. Acta Mechanica Solida Sinica, 2009, 22(5):453-464.

3. Jin, Z.-H. and Feng, Y. Z., An array of parallel edge cracks with alternating lengths in a strip subjected to a thermal shock. Journal of Thermal Stresses, 2009, 32:431-447.

4. Jin, Z.-H. and Feng, Y. Z., Thermal fracture resistance of a functionally graded coating with periodic edge cracks. Surface & Coatings technology, 2008, 202: 4189-4197.

5. Jin, Z.-H. and Feng, Y. Z., Effects of multiple cracking on the residual strength behavior of thermally shocked functionally graded ceramics. International Journal of Solids and Structures, 2008, 45: 5973-5986.

6. Feng, Yuezhong and He Luwu, Thermal stress analysis for laminated composite plates. Journal of Lanzhou University (Nature Science), 2005, 41(5): 94-99.

* Conference Papers

7. Guo, Q., Feng, Y. Z and Jin, Z.-H., Fracture Aperture For Wellbore Strengthening Applications, America Rock Mechanics Association, the 45th U.S. Rock Mechanics/Geomechanics Symposium, San Francisco, California, June?26 - 29, 2011 , paper ID: 11-378.

8. Guo, Q., Jin, Z.-H. and Feng, Y. Z, Pore Pressure and Chemical Stresses around a Borehole in a Shale Formation, America Rock Mechanics Association, the 42nd US Rock Mechanics Symposium and 2nd U.S.-Canada Rock Mechanics Symposium, San Francisco, June 29-July 2, 2008, paper # ARMA 309.

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