QUASI-STATIC AND DYNAMIC TORSION TESTING OF CERAMIC MICRO AND NANO-STRUCTURED COATINGS USING SPECKLE PHOTOGRAPHY
作者： Francois Barthelat , Kostyantin Malukhin , Horacio Espinosa
关键词:
摘要: An experimental methodology for the quasi-static and dynamic testing of Al2O3/TiO2 WC/Co coatings on aluminum substrates is presented. A stored energy Kolsky bar apparatus was used both loading. Acquisition speckle images at different loading stages allowed determination shear strains in gage region specimen identification deformation mechanisms as a function coating grain size. The interaction between substrate investigated by correlating damage to measured stress-strain curves. It identified that cracks develop coating, they are bridged underlying ductile substrate. Optical SEM interrogation fracture surface also show low percentage porosity severe created residual stresses. These stresses arise during manufacturing process. pre-existing believed be cause moduli strengths exhibited coatings. comparison response carried out, assess strain-rate effects, well micro versus nano size same composition.
springer.com
sci-hub.st 参考文章(8)
J. He, M. Ice, E. J. Lavernia, Synthesis and Characterization of Nanocomposite Coatings Springer, Dordrecht. pp. 131- 148 ,(2000) , 10.1007/978-94-011-4052-2_11
Howard Kuhn, Dana Medlin, Mechanical testing and evaluation ASM International. ,(2000)
B. H. Kear, W. E. Mayo, Thermal Sprayed Nanostructured Hard Coatings Springer, Dordrecht. pp. 113- 129 ,(2000) , 10.1007/978-94-011-4052-2_10
K. Jia, T.E. Fischer, B. Gallois, Microstructure, hardness and toughness of nanostructured and conventional WC-Co composites Nanostructured Materials. ,vol. 10, pp. 875- 891 ,(1998) , 10.1016/S0965-9773(98)00123-8
Hans Conrad, Jagdish Narayan, On the grain size softening in nanocrystalline materials Scripta Materialia. ,vol. 42, pp. 1025- 1030 ,(2000) , 10.1016/S1359-6462(00)00320-1
T. C. Chu, W. F. Ranson, M. A. Sutton, Applications of digital-image-correlation techniques to experimental mechanics Experimental Mechanics. ,vol. 25, pp. 232- 244 ,(1985) , 10.1007/BF02325092
H. D. Espinosa, A. Patanella, M. Fischer, A novel dynamic friction experiment using a modified Kolsky bar apparatus Experimental Mechanics. ,vol. 40, pp. 138- 153 ,(2000) , 10.1007/BF02325039
H. A. Bruck, S. R. McNeill, M. A. Sutton, W. H. Peters, Digital image correlation using Newton-Raphson method of partial differential correction Experimental Mechanics. ,vol. 29, pp. 261- 267 ,(1989) , 10.1007/BF02321405