Engineering Mechanical

SUMMARY

* ***** *********** ** ******** and characterization of composites, metals and biomaterials.

Broad knowledge in design of experiments (DOE), static/dynamic mechanics, materials synthesis & characterization, mechanical design, failure analysis and computer aided instrumentation.

Highly proficient in 3D modeling and stress analysis with FEM

Strong writing and oral communication skills.

Published peer reviewed articles and gave presentations in professional conferences.

Specialties:

Materials Characterization: TEM, SEM, ESEM, EDX, XRD, DSC, TGA, MTS Hydraulic Testing Machine;

Finite Element Modeling: MSC Marc, Abaqus;

Analytical Modeling: LabVIEW, Matlab;

3D Design: SolidWorks, AutoCAD;

Instrumentation: LabVIEW;

Statistical Analysis: Origin, Mathematica, Matlab, Excel.0

EDUCATION

University of California, Irvine Ph.D in Materials Science and Engineering (3.9 GPA), September, 2012.

University of California, Irvine MS in Materials Science and Engineering (3.7 GPA), December, 2008.

South China University of Technology BS in Materials Science and Engineering (3.7 GPA), June, 2007.

RESEARCH EXPERIENCE

Department of Chemical Engineering and Materials Science at University of California, Irvine

Sept.2008 –Sept.2012

--Modeling and characterization of composite materials.

Developed analytical models with finite difference methods and finite element model (Abaqus) to study bending behavior of composite.

Validated analytical models by applying non-destructive imaging techniques to measure strain under bending.

Built and maintained a suite of LabVIEW Virtual instruments that control and acquire data for mechanical testing.

Designed and conducted dynamic mechanical tests to study viscoelastic behavior of composites

Developed constitutive models for regression modeling of non-linear behavior of composites.

Designed and fabricated composite with novel structure from inspiration of modeling results.

-- Finite element modeling for dynamic mechanical behavior of dental implant materials.

Performed impact analysis for dental implants materials using FEM with MSC Marc.

Analyzed how microcracks affect stress distribution within dental implants under dynamic loading.

-- Metallurgical testing and Failure analysis

Collaborated with an industrial corporation (MetroLaser Inc.) to create a laser assisted fatigue damage detection technology.

1) Designed and conducted metal fatigue tests based on ASTM testing standards.

2) Assisted with installation of portable Laser instr00uments for in-situ detection of fatigue cracks.

3) Examined metal fatigue failure mechanism with replica techniques and electron microscopy.

--Engineering & Research Leadership

Trained and advised multiple undergraduate researchers in fields of mechanical testing and modeling.

Assisted with the setup and maintenance of research facility including automated MTS test system, Environmental SEM, Rockwell hardness tester, etc.

Department of Materials Science and Engineering at South China University of Technology

May.2006 – Jun. 2007

--Preparation and characterization of implant materials

Project 1:

Prepared two-layer integrative hydrogels as bionic articular cartilage replacement materials.

Determined the biocompatibility of prepared hydrogels as replacement materials by investigating water states using DSC and TGA.

Project 2:

Synthesized leucite powder as an addictive to strengthen dental porcelain.

Evaluated crystallization mechanism of leucite powder using a combination of techniques, ranging from chemical reaction monitoring to microstructure imaging.

TEACHING EXPERIENCE

Department of Chemical Engineering and Materials Science at University of California, Irvine

Apr. 2008 – Jun. 2011

Courses: Design Failure Investigation

Prepared student research projects, set up experimental apparatus and provided experimental guidelines.

Led discussion sessions and office hours to facilitate students’ learning of complex materials and concepts.

Developed presentations for groups of students with different majors.

PUBLICATIONS

X. Liu, H. Youssefpour, A. P. Summers, M. N. Dean and J. C. Earthman, 2012. Visco-elastic behavior of composite skeleton from the Jaws of Blue Sharks. Submitted to Journal of Biomechanics.

X. Liu, H. Youssefpour, A. P. Summers, M. N. Dean and J. C. Earthman, 2012. Instrumented percussion analysis of shark composite skeleton. In preparation.

X. Liu, A. P. Summers, M. N. Dean and J. C. Earthman, 2010. Mechanics of a composite structural model of the shark's skeleton in bending: a novel architecture for biomimetic materials. Journal of Materials Science and Engineering C 30. 1077-1084.

Y.Zhang, C. Qu, J. Wu, Ming. L, P. Rao, X. Liu, 2008. Synthesis of Leucite from Potash Feldspar, Journal of Wuhan University of Technology-Mater. Sci. Ed. 23 (4), 452-455.

X. Liu, L.Zeng, P. Liu, H. Wang, 2006. Preparation of nanometer titanium dioxide by industrial titaniferous Solution, Foshan Ceramics 11.

PRESENTATIONS

J. C. Earthman, B. D. Buckner, K. S. Chan, X. Liu, V. Markov, 2012. Leave-in-Place Laser Scanning for Fatigue Damage Monitoring and Prognosis. The Minerals, Metals & Materials Society Annual Meeting & Exhibition (From Macro to Nano, Understanding Mechanical Behavior across Length Scales: A Structural Materials Division Symposium in Honor of Robert Ritchie).

X. Liu, H. Youssefpour, M. N. Dean, A. P. Summers & J. C. Earthman,2011. Dynamic Mechanical Behavior of Shark Tessellated Skeleton. The Minerals, Metals & Materials Society Annual Meeting & Exhibition (Symposium: Biological Materials Science; San Diego, CA).

X. Liu, H. Youssefpour, M. N. Dean, A. P. Summers & J. C. Earthman, 2011. Numerical Study of Shark Tessellated Skeleton in Bending. Chemical Engineering and Materials Science Seminars, UC Irvine.

X. Liu, H. M. N. Dean, A. P. Summers & J. C. Earthman, 2010. Numerical Analysis of Tessellated Shark Cartilage in Bending. The Minerals, Metals & Materials Society Annual Meeting & Exhibition. (Biological Materials Science Symposium; Seattle, WA).

AWARDS, HONORS & ASSOCIATIONS

Research Scholarship of Department of Chemical Engineering and Materials Science at UC Irvine, 2008 - 2011.

Fellowship Award of Department of Chemical Engineering and Materials Science at UC Irvine, 2007 - 2008.

First Class Student Scholarship of South China University of Technology, 2003 - 2005.

Enterprise Scholarship of South China University of Technology, 2004 - 2005.

Members of the American Society for Metals (ASM) and the Minerals, Metals & Materials Society (TMS).

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