Mechanical Properties of Thin Films of Coals by Nanoindentation
In the current work, depth-sensing indentation tests were applied at different coals microcomponents in order to characterize their mechanical properties. To this end, three coals were chosen differing by their rank and properties. Thin transparent films of such coals were prepared as samples in order to use transmitted light microscopy to achieve exact positioning of indent probe in the zone occupied by specific coal microcomponent. Experimental procedures allowed obtaining load-displacement curves at different microcomponents. These curves revealed differences between microcomponent vitrinite behavior among coals of different types. Measured values of elastic moduli and hardness also proved that they variate with coal rank. It was concluded that matrix of coals (vitrinite microcomponent) transforms its mechanical properties with rank, whereas the inclusions properties do not change as significantly.
KeywordsCoal Mechanical properties Microcomponent Matrix Inclusion Depth-sensing indentation Elastic modulus Hardness
The work was supported by the Russian Science Foundation (grant No. 16-17-10217).
- 2.Balokhonov, R.B., Romanova, V.A., Makarov, R.V., Voroshilov, S.P.: Effect of complex interface geometry on deformation of a coal composite. Numerical simulation. Fiz. mezomechanica 10, 75–79 (2007)Google Scholar
- 5.Konopka, K.: Crack propagation in composites with ceramic matrix. In: IUTAM Symposium on Multiscale Modelling of Damage and Fracture Processes in Composite Materials, vol. 135, pp. 255–262 (2006). https://doi.org/10.1007/1-4020-4566-2_30
- 9.Bulychev, S.I., Alekhin, V.P., Shorshorov, M.K., Ternovskij, A.P., Shnyrev, G.D.: Determination of Young modulus by the hardness indentation diagram. Zavod. Lab. 41, 1137–1140 (1975). (in Russian)Google Scholar