Newcastle University

 I completed my Ph.D thesis in 2 years and 9 months in Materials Engineering at Newcastle.  Then I worked as research associate at Newcastle & London.  

I have worked on mechanics of advanced materials such as energy related materials and semiconductor materials, finite element simulation, nanomechanics, nanotribology, biomaterials and cell mechanics.  

I investigated the fracture and adhesion failure in ceramic coatings, creep in metallic coating, plastic deformation at submicro/nanoscale, viscoelastic behaviour of polymers, nonlinear elasticity in biomaterials etc. I am also very interested in fundamental nanoindentation mechanics, fracture mechanics and nonlinear elastic mechanics.

Topical Review

Jinju Chen, Indentation based methods to assess fracture toughness for thin coatings, Journal of Physics D: Applied Physics (2012) 45 203001 doi:10.1088/0022-3727/45/20/203001

 Invited papers 

Chen J, Bull SJ. Approaches to investigate delamination and interfacial toughness in coated systems: an overview. Journal of Physics D: Applied Physics 2011,44 3 034001.

Chen J, Bull SJ. On the factors affecting the critical indenter penetration for measurement of coating hardness. Vacuum 2009. ,83 6 911-920.

Chen J, Bull SJ. Indentation fracture and toughness assessment for thin optical coatings on glass. Journal of Physics D: Applied Physics 2007, 40(18), 5401-5417.

 Conference chair

·         Chairing a session in Nanoindentation Conference at Newcastle 2010.

Conference organization committee

·          Conference organizing committee for Nanoindentation Conference at Newcastle 2008.

Reviewer for funding bodies

·         Czech Republic Science Foundation*.  *: frequently

 External Ph.D examiner for the following University
Nanyang Technological University, Singapore

 Reviewer for the chapters in the technical book proposal for

 Wiley

 Reviewer for Journals

Manuscript reviewer for Nanotechnology, Journal of Physics: Condensed Matter, Biomedical Materials, Journal of Materials Research*, J. Phys. D: Appl. Phys.*, Thin Solid Films*, Surface Coating & Technology*, Semiconductor Science and Technology, Tribology International, Nanoscience and Nanotechnology Letters.

*: frequently

Invited lectures and presentations

• Apr. 2012: University of Kentucky, USA
• Apr. 2012: University of California, San Diego, USA
• Dec. 2011:  Nanyang Technological University, Singapore
• June 2011: Materials Today Virtual Conference: Characterization Techniques and Analysis.
• Dec. 2010: The University of Hong Kong, Hong Kong, China.
• Dec. 2010: Peking University, Beijing, China.
• Dec. 2010: Beijing Institute of Technology, Beijing, China.
• Sept. 2010: University of Cambridge, UK
• Aug. 2010: Symposium of Chondrocyte Mechanics in 6th World Congress on Biomechanics, Singapore.
•  Aug.2010: Nanyang Technological University, Singapore .
•  Aug. 2008: Loughborough University, UK.
•  May 2008: Institute of Physics One–Day Seminar on Nanoindentation and Nanotribology, National Physical Laboratory,UK
•  May 2008: Nanomechanical Labortary, Hysitron Inc., Minneapolis, USA.
•  May 2008: University of South Carolina, USA.

Academic Visitor 

Nanyang Technological University, Singapore.
Loughborough University, UK.
Max-Planck-Institut für Eisenforschung, Dusseldorf, Germany.

Conference presentations

I have made more than 30 presentations in international conferences such as MRS Fall meeting, MS&T conference, International Conference on Metallurgical Coatings and Thin Films (ICMCTF), Congress of the European Society of Biomechanics, International Conference on Cell & Stem Cell Engineering (ICCE). 

Professional membership

·         Materials Research Society

·          Institute of Physics

·          Royal Microscopical Society

·         Europe Society of Biomechanics

·         Tissue and Cell Engineering Society

·         British society of Matrix biology

Recent awards (after 2007)

·         European Society of Biomechanics (ESB) Travel Award 2010

·         International Travel Grant (The Royal Society) 2010

·         The following article has been selected as one of the highlights in the year of 2007 in J. Phys. D:  J. Chen and S J Bull, Indentation fracture and toughness assessment for thin optical coatings on glass, J. Phys. D: Appl. Phys. 40 (2007) 5401-5417

I have worked on various multidisciplinary research projects.

Expertise

Fracture mechanics, Fractrue toughness assessment, Adhesion evaluation, Nanoindentation, SEM, AFM, Finite element simulation, Mathematical Modelling.  

Nanomechanics

·         Nanoindentation

·         Nanotribology

Finite Element Analysis

·         Biomechanics

·         Modelling deformation in advanced materials

·         Modelling Interfacial crack initiation and evolution

Thin Film Mechanics

·         Energy related coatings (Anode Coatings & Solar Control Coatings)

·         Low friction coatings

·         Polymeric coatings

·         Hard coatings

·         MEMS

Mechanics of Biomaterials

·         Tissue engineered bone

·         Cell-matrix interaction

 ·         Cell mechanics

 ·         Hydrogel scaffold

Teaching : Applied mechanics

Supervision: Project students in Bioengineering 

• Chen J. On the determination of coating toughness during nanoindentation. Surface and Coatings Technology 2012, 206(13), 3064-3068.
• Chen JJ, Bull SJ. Approaches to investigate delamination and interfacial toughness in coated systems: an overview. Journal of Physics D: Applied Physics 2011,44 3 034001.
• Chen J, Bader DL, Lee DA, Knight MM. Finite element modeling of cell deformation when chondrocyte seeded agarose is subjected to compression. In: 8th International Conference on Cell & Stem Cell Engineering (ICCE). 2011, Ireland: Springer.
• Chen JJ, Birch MA, Bull SJ. Nanomechanical characterization of tissue engineered bone grown on titanium alloy in vitro. Journal of Materials Science: Materials in Medicine 2010, 21(1), 277-282.
• Chen JJ, Lin ZS, Bull SJ, Phillips CL, Bristowe PD. Experimental and modelling techniques for assessing the adhesion of very thin coatings on glass. Journal of Physics D: Applied Physics 2009,42 21 214003.
• Chen JJ, Bull SJ. Finite element analysis of contact induced adhesion failure in multilayer coatings with weak interfaces. Thin Solid Films 2009, 517(13), 3704-3711.
• Chen JJ, Bull SJ. Modelling the limits of coating toughness in brittle coated systems. Thin Solid Films 2009, 517(9), 2945-2952.
• Chen J, Bull SJ, Roy S, Kapoor A, Mukaibo H, Nara H, Momma T, Osaka T, Shacham-Diamand Y. Nanoindentation and nanowear study of Sn and Ni-Sn coatings. Tribology International 2009, 42(6), 779-791.
• Chen J, Bull SJ. On the factors affecting the critical indenter penetration for measurement of coating hardness. Vacuum 2009. ,83 6 911-920.
• Chen J, Bull SJ. Relation between the ratio of elastic work to the total work of indentation and the ratio of hardness to Young's modulus for a perfect conical tip. Journal of Materials Research 2009, 24(3), 590-598.
• Chen J, Bull SJ. The investigation of creep of electroplated Sn and Ni-Sn coating on copper at room temperature by nanoindentation. Surface and Coatings Technology 2009,203 12 1609-1617.
• Chen J, Bull S. A modified model to determine limiting values of coating toughness by nanoindentation. Tribology - Materials, Surfaces and Interfaces 2008,2 4 219-224.
• Chen J, Bull SJ. Investigation of the relationship between work done during indentation and the hardness and Young's modulus obtained by indentation testing. International Journal of Materials Research 2008, 99(8), 852-857.
• Chen J, Bull SJ, Roy S, Mukaibo H, Nara H, Momma T, Osaka T, Shacham-Diamand Y. Mechanical analysis and in situ structural and morphological evaluation of Ni-Sn alloy anodes for Li ion batteries. Journal of Physics D: Applied Physics 2008, 41(2), -.
• Chen J, Bull SJ. Modelling of indentation damage in single and multilayer coatings. In: Proceeding of International Union of Theoretical and Applied Mechanics (IUTAM) Symposium on Modelling Nanomaterials and Nanosystems. 2008, Aalborg, Denmark.
• Chen J, Bull SJ. Multi-cycling nanoindentation study on thin optical coatings on glass. Journal of Physics D: Applied Physics 2008, 41(7), 074009.
• Chen J, Bull SJ. FEM Investigation of the relationship between the work done by indentation and the hardness and Young’s modulus obtained from indentation load-displacement curves. In: Proceedings of the 6th International Conference on materials Processing for Properties and Performance. 2007, Beijing, China.
• Chen J, Bull SJ. Indentation fracture and toughness assessment for thin optical coatings on glass. Journal of Physics D: Applied Physics 2007, 40(18), 5401-5417.
• Chen J, Bull SJ. Loading rate effects on the fracture behaviour of solar control coatings during nanoindentation. Thin Solid Films 2007, 516(2-4), 128-135.
• Chen J, Bull SJ. A critical examination of the relationship between plastic deformation zone size and Young's modulus to hardness ratio in indentation testing. Journal of Materials Research 2006, 21(10), 2617-2627.
• Chen J, Bull SJ. A new method based on work-displacement curve to assess the toughness of coated system. In: Surface Engineering for Manufacturing Applications. 2006, Boston, MA: Materials Research Society.
• Chen J, Bull SJ. An energy based model to estimate coating toughness in the case that there is no excursion in the load-displacement curve. In: Materials Science and Technology (MS&T) 2006.2006,Duke Energy Center, Cincinnati, Ohio, USA:The Minerals, Metals & Materials Society
• Chen J, Bull SJ. Assessment of the adhesion of ceramic coatings. In: CIMTEC.2006,Acireale, Sicily:Trans Tech Publications Ltd.
• Chen J, Bull SJ. Assessment of the toughness of thin coatings using nanoindentation under displacement control. In: 32nd International Conference on Metallurgical Coatings and Thin Film. 2006, San Diego, CA: Thin Solid Films, Elsevier SA.
• Chen J, Bull SJ. On the relationship between plastic zone radius and maximum depth during nanoindentation. Surface and Coatings Technology 2006, 201(7), 4289-4293.
• Chen J, Bull SJ. A new method based on the work-displacement curve to asses the toughness of coated systems. In: Materials Research Society Symposium Proceedings.2005,Boston, USA:Materials Research Society
• Chen JJ. Indentation-based methods to assess fracture toughness for thin coatings. Journal of Physics D: Applied Physics 2012, 45(20), 203001.