Application of the "Brazilian test" to determine the strength of materials obtained by electric pulse consolidation of powders

International Conference on Synthesis and Consolidation of Powder Materials

Goltsev, V.Y.^1^2 ; Grigor'Ev, E.G.^2 ; Gribov, N.A.^1 ; Osintsev, A.V.^1 ; Plotnikov, A.S.^1^2

National Research Nuclear University, MEPhI, Moscow

115409, Russia^1

Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, Chernogolovka

142432, Russia^2

关键词: Brazilian test;    Electric pulse;    Experimental analysis;    Plane-of-symmetry;    Sample thickness;    Short cylinder;    Small size samples;    Testing samples;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/558/1/012012/pdf
DOI  :  10.1088/1757-899X/558/1/012012

来源: IOP

【 摘 要 】

Testing of short cylinders according to the "Brazilian test" scheme is considered as a method of assessing the tensile strength of brittle materials obtained by electric pulse consolidation of powders. The paper presents a calculated using FEM and an experimental analysis of the behavior of short cylinders (thick disks) when loaded according to the "Brazilian test" scheme. The calculation shows the weak influence of the disk thickness on the average and maximum tensile stresses in the plane of symmetry of the disk. Results of testing of small samples made of cast iron and graphite are presented. It is shown a good correspondence between the results of the test samples from cast iron when using formula recommended by the ASTM Standard D3967-95a, and the strength of the material when tested in tension. The results of testing samples of graphite were 1.5-2 times less than its tensile strength. The results of testing of small-size samples of heavy alloy WNiFe and aluminum oxide obtained by electric pulse consolidation of powders are presented. The influence of the pressure and current pulse on the fracture resistance of the alloy WNiFe and the sample thickness on the strength of Al2O3 is investigated. Thus, the possibility of testing small samples according to the "Brazilian test" scheme to determine the tensile strength of materials obtained by electric pulse consolidation of powders is demonstrated.