Faculty Profiles
   
 
John R. Hellmann

Professor of Materials Science and Engineering,
Associate Dean for Education in the College of Earth and Mineral Sciences

014 DeikeBuilding
814-865-0163
hellmann@matse.psu.edu
 

Research Interests:
• Thermal, elastic, mechanical properties of ceramic, metal, intermetallic, and composite    materials for high temperature applications
• Processing/structure/properties/performance relationships
• Metastable and equilibrium phase relationships
• Polymer precursor routes to fabrication of ceramics and composites via direct foaming    and infiltration
• Slow crack growth and fracture behavior of glasses and ceramics
Thermal fatigue behavior of monolithic and composite materials


Journal Articles and Publications:
1. P. Colombo, J.R. Hellmann, and D.L. Shelleman, "Mechanical Properties of Silicon Oxycarbide Ceramic Foams," J. Am. Ceram. Soc., 84(102245-51(2001)

2. M. J. Pan, P.A. Hoffman, D.J. Green, and J.R. Hellmann, "Elastic Properties and Microcracking Behavior of Particulate Titanium Diboride-Silicon Carbide Composites," J. Am. Ceram. Soc., 80(3)692-98(1997)

3. M.H. Krohn, J.R. Hellmann, D.L. Shelleman, C.G. Pantano, and G.S. Sakoske, "Biaxial Flexure Strength and Dynamic Fatigue of Soda-Lime-Silica Float Glass," J. Am. Ceram. Soc., in press

4. J.A. Howell, J.R. Hellmann, and C.L. Muhlstein, "Nanomechanical Properties of Commercial Float Glasses," accepted for publication in J. Non-Crystalline Solids, October 7, 2007

5. J.A. Howell, J.R. Hellmann, and C.L. Muhlstein, "Correlations Between Free Volume and Pile-Up Behavior in Nanoindentation Reference Glass," accepted for publication in Materials Letter, November 15, 2007

6. M. Fox and John R. Hellmann, “Microstructure and Creep Behavior of SiAlON Materials,” INVITED REVIEW PAPER in the topical issue on silicon nitride ceramics in the Journal of Applied Ceramic Technology, accepted for publication September 10, 2007

7.Walter G. Luscher, John R. Hellmann, David L. Shelleman, and Albert E. Segall, “A Critical Review of the Diametral Compression Method for Determining the Tensile Strength of Spherical Aggregates,“ J. Testing and Evaluation, 35(6)2007

8.Kevin M. Fox, John R. Hellmann, Mark S. Angelone, and Russell L. Yeckley, “Refinement of the a-Phase Area in the Yb-SiAlON System,” J. Am. Ceram. Soc., 90(5)1607-1610(2007)


Chapters in Books:

1.John R. Hellmann, Innovation and Invention Overview, in Global Roadmap for Ceramics and Glass Technology, Proceedings of the 1st International Congress on Ceramics, Wiley-Interscience, John Wiley & Sons, Hoboken, New Jersey , 2007,  pp. 85-88.

2.John  R. Hellmann, Consumer Products Overview , in Global Roadmap for Ceramics and Glass Technology, Proceedings of the 1st International Congress on Ceramics, Wiley-Interscience, John Wiley & Sons, Hoboken, New Jersey , 2007, pp. 263-265.

 
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