Luís Guerra Rosa

Fotografia: Luís Guerra Rosa Professor Associado

Licenciado em Engenharia Metalúrgica, Instituto Superior Técnico, 1977

Doutoramento em Engenharia Mecânica, Instituto Superior Técnico, 1986

Agregação em Engenharia de Materiais, Instituto Superior Técnico, 2004

Telefone: 21 8417642, Ext: 1642, Sala: 0.06 (Cave do Pavilhão de Mecânica II) Correio electrónico

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Area of scientific activity

The area of scientific activity is Materials Science and Engineering with emphasis on structural & technological characterization of materials at different stages of their elaboration, to understand their behaviour, to compare their properties to references and specifications, and to evaluate their performances in condition simulating applications (including high temperature tests and the use of non-contact extensometry techniques). Luís Guerra Rosa coordinates a research group that works on monolithic (brittle) ceramic materials and also on ceramic composites, including natural ceramics (petrous materials), with an interdisciplinary approach, strengthening the structural/engineering applications, and also paying attention to the crucial aspects of microstructure and processing. The links and joint projects with foreign groups reached a very good level of collaboration, with publications and research contracts showing the degree of interdisciplinarity.

Present research topics

  • Ornamental stones (natural ceramics); rock fracture mechanics and stone cutting technologies. Microstructure and mechanical properties, dynamic test methodologies for assessing the elastic constants; characterisation of new diamond tools; and study of new processing technologies, including polishing. Member of OSNET. Partner in several research projects, e.g. PRO-STONE (2005-2008); PROVIPS (2008-2010)
    • ; and X-STONE (2010-2012).
  • Research to support the development of standards for characterization methods for ceramic (SiC, Al2O3) and carbon fibres used to reinforce ceramic matrix and carbon-carbon composites. Validation of mechanical test procedures and assessment of factors that affect the measurements, namely of tensile test methods for characterising reinforcements (multifilament tows consisting of small-diameter SiC, Al2O3 and carbon fibres) and test methods to determine the fiber/matrix interfacial frictional shear stress (using minicomposites); evaluation of damage in composites through cyclic tensile tests. Development of statistical models for the distribution of strength data. Member of CEN/TC184/SC 1 CÉRAMIQUES TECHNIQUES AVANCÉES - COMPOSITES CÉRAMIQUES: www.afnor.fr
  • Extending horizon of materials processing with solar energy. Ceramic materials processing by solar furnace: tests using different heating and cooling cycles; comparison between solar-sintered ceramic bodies and those produced in conventional furnaces; carbide synthesis of d-group transition metals and kinetic aspects of reaction under the solar spectral radiation. User of Plataforma Solar de Almería and PROMES-CNRS.

Characteristic Publications

  • Lam dos Santos JP, Rosa LG, Amaral PM, "Temperature effects on mechanical behaviour of engineered stones", CONSTRUCTION AND BUILDING MATERIALS 25 (1): 171-174, 2011
  • Rosa LG, Figueiredo I, "Demonstration of the Robustness of Maximum Likelihood Estimation to Distinguish Mixtures of two Weibull Populations in Failure Data of Brittle Materials", MATER SCI FORUM 636-7: 1443-1450, 2010
  • Amaral PM, Fernandes JC, Rosa LG, "Wear mechanisms in materials with granitic textures – applicability of a lateral crack system model", WEAR 266 (7-8): 753-764, 2009
  • Rosa LG, "High-temperature fracture behavior of ceramic matrix composites: an overview", in Evaluation, Inspection and Monitoring of Structural Integrity, editors G.C.Sih, S.T.Tu and Z.D.Wang, East China Univ. of Science and Tech. Press, (2008) ISBN 978-7-5628-2403-9/TB.25; pp 17-28.
  • Rosa LG, Amaral PM, Fernandes JC, "Experimental determination of Young's modulus in PM metal matrices used in diamond impregnated tools for cutting hard materials", POWDER METALLURGY, 51 (1): 46-52 MAR 2008
  • Amaral PM, Rosa LG, Fernandes JC, "Assessment of fracture toughness in ornamental stones", INT. JOURNAL OF ROCK MECHANICS & MINING SCIENCES, 45 (4): 554-563 JUN 2008
  • Reis L, Amaral PM, Li B, de Freitas M, Rosa LG, "Evaluation of the residual stresses due to the sintering process of diamond–metal matrix hot-pressed tools", THEORETICAL AND APPLIED FRACTURE MECHANICS, 49 (2): 226–231 APR 2008
  • Oliveira FAC, Granier B, Badie J-M, Fernandes JC, Rosa LG, Shohoji N, "Synthesis of tungsten sub-carbide W2C from graphite/tungsten powder mixtures by eruptive heating in a solar furnace", INT. JOURNAL OF REFRACTORY METALS & HARD MATERIALS 25 (4): 351–357, 2007
  • Rosa LG, Lamon J, Figueiredo I, Oliveira FAC, "A method to distinguish extrinsic and intrinsic fracture-origin populations in monolithic ceramics", JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 26 (2006): 3887–3895
  • Rosa LG, Colella A, Anjinho CA, "Effect of paraffin oil used as a lubricant in tensile tests of carbon fibre bundles", MATER SCI FORUM 514-6: 672-676, 2006
  • Amaral PM, Pozo D, Pinto S, Fernandes JC, Rosa LG, "Un metodo standard per classificare gli utensili diamantati impiegati nel campo della costruzione", DIAMANTE Applicazioni & Tecnologia, Anno 12, nº 44 (ISSN 1824-5765) pp. 37-53, Marzo 2006
  • Amaral PM, Rosa LG, Fernandes JC, "Experimental evaluation of Dynamic Test Methodologies for assessing the Elastic Constants of Granitic Rocks", JOURNAL OF NONDESTRUCTIVE EVALUATION 24 (4): 135-142, 2005
  • Rosa LG, Amaral PM, Anjinho C, Fernandes JC, "Evaluation of Diamond Tool Behaviour for Cutting Stone Materials", INDUSTRIAL DIAMOND REVIEW, Issue 1 / 2004, 45-50
  • Rosa LG, "Diamond Tool Characterisation Methodologies: New Perspectives for Stone Processing", Chapter 5 in Application of Diamond Technology in the Stone Sector, OSNET Editions, Volume 4, EUR 20637 / 4, edited by S. Carosio and I. Paspaliaris, pp. 45- 63, (2004)
  • Rosa LG, Figueiredo I, Anjinho CA, "Statistical Evaluation of the adequacy of a Mixture of Two Weibull Distributions to model Strength and Fracture-Strain of Carbon Fibres", MATER SCI FORUM 455-6: 676-680, 2004
  • Rosa LG, "Rochas Ornamentais e Dimensionais: Quais as razões que levam à sua caracterização ?", Revista ROCHAS & EQUIPAMENTOS, 72 (XIX): 6-10, 2003
  • Rosa LG, Amaral PM, Anjinho C, Fernandes JC, Shohoji N, "Fracture toughness of solar-sintered WC with Co additive", CERAMICS INTERNATIONAL 28 (3): 345-348, 2002