Encontrados 8 documentos, a visualizar página 1 de 1
Contribuições da Embrapa Trigo e da Embrapa Transferência de Tecnologia ao dese...
DALMAGO, G. A.; ACOSTA, A. da S.; SANTI, A.; GREHS, R. C.; PIRES, J. L. F.; FAGANELLO, A.; SANTOS, H. P. dos; FONTANELI, R. S.; SATTLER, A.2009
Comparison between Berkovich, Vickers and conical indentation tests: A three-di...
Sakharova, N. A.; Fernandes, J. V.; Antunes, J. M.; Oliveira, M. C.http://www.sciencedirect.com/science/article/B6VJS-4TX33SP-1/2/d6a73a3da766b19e2ec9da73a5f5d209
Mechanical characterization of composites prepared from WC powders coated with ...
Fernandes, C. M.; Senos, A. M. R.; Vieira, M. T.; Antunes, J. M.In this study composite powders of WC and Ni/Fe/Cr were prepared in an innovative way, which consists of the sputter-deposition of the metallic binder onto the tungsten carbide particles. Compacts of coated powders were sintered by conventional vacuum sintering followed by hot isostatic pressing (HIP) to reach almost full densities. In order to evaluate the mechanical properties of reduced specimens size (micro...
Influence of Vickers tip imperfection on depth sensing indentation tests
Antunes, J. M.; Menezes, L. F.; Fernandes, J. V.In the last decade, the development of depth sensing indentation equipment has permitted two of the most conventional mechanical properties of materials to be easily determined: hardness and Young's modulus. Some care is needed to accurate results from the experimental determination of the aforementioned mechanical properties. In this study, numerical simulations were performed on two well-known materials (Bk7 ...
A new approach for reverse analyses in depth-sensing indentation using numerica...
Antunes, J. M.; Fernandes, J. V.; Menezes, L. F.; Chaparro, B. M.This paper seeks to present a new approach to reverse analysis in depth-sensing indentation which makes use of numerical simulation. This methodology allows the results of experimental hardness tests acquired with single indenter geometry to be used to determine the plastic properties of materials. Forward and reverse analyses of high deformation three-dimensional numerical simulations of Vickers indentation te...
Three-dimensional numerical simulation of Vickers indentation tests
Antunes, J. M.; Menezes, L. F.; Fernandes, J. V.The development of depth sensing indentation equipment has allowed easy and reliable determination of two of the most popular measured mechanical properties of materials: the hardness and the Young's modulus. However, some difficulties emerge in the experimental procedure to calculate accurate values of these properties. This is related to, for example, the tip geometrical imperfections of the diamond pyramidal...
On the evaluation of the ductility of thin films
Antunes, J. M.; Menezes, L. F.; Vieira, M. F.; Fernandes, J. V.; Trindade, B.; Ramos, A. S.; Vieira, M. T.A new tensile test procedure has been developed to evaluate the ductility of thin films deposited on a substrate. The tensile sample has a continuously variable cross-sectional area, resulting in a continuous strain gradient along the sample after deformation. The films present cracks where the strain imposed exceeds their ductility. The strain attained at the boundary of the region where cracks appear characte...
Ultra-microhardness testing procedure with Vickers indenter
Antunes, J. M.; Cavaleiro, A.; Menezes, L. F.; Simões, M. I.; Fernandes, J. V.Depth-sensing indentation equipment is widely used for evaluation of the hardness and Young's modulus of materials. The depth resolution of this technique allows the use of ultra-low loads. However, aspects related to the determination of the contact area under indentation should be cautiously considered when using this equipment. These are related to the geometrical imperfections of the tip, the diamond pyrami...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||