Automation of Measuring Fracture Surface Area and Shortening of Measuring Time for Hard Materials (特集 硬質材料) Automation of Measuring Fracture Surface Area and Shortening of Measuring Time for Hard Materials
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The tedious manual procedures and long time needed for the measuring of S<SUB>mf</SUB> which is the main process in our proposed method for estimating fracture toughness (K<SUB>IC</SUB>) of hard materials by using our proposed equation ofσ<SUB>m</SUB>=ψK<SUB>IC</SUB>S<SUB>mf</SUB><SUP>1/2</SUP>(σ<SUB>m</SUB> is the bending fracture strength, ψ is a factor and S<SUB>mf</SUB> is the macroscopic fracture surface area of all fragments of one test piece) were tried to avoid and shorten respectively by automating the main procedures.<BR>The results were as follows: (1) The procedures which were successfully automated, and the devise or software used for the automation were as follows, respectively: (1-1) The moving of the fragment at a regular interval to the direction of X- and Y-axes in order to hit the laser beam of displacement meter onto a lot of measuring lattice points imaginarily figured on the fracture surface, and the use of automatic X-Y mechanical stage, (1-2) The inputting of data on Z-coordinates of all lattice points obtained by laser displacement meter to personal computer, and the uses of PC card and data collection software which converts analog data on Z-coordinates from the displacement meter to digital ones appropriate to the input, and orders the input of the data to the computation program, respectively. The calculation of S<SUB>mf</SUB> from these coordinates was of course instantaneously made by using the computation program including X-and Y-coordinates, in a similar way as in the previous method. (2) The measuring time of S<SUB>mf</SUB> for WC-10mass%Co cemented carbide was shortened by the automations to be about 24% of the one needed in the previous manual method.
- J. Jpn. Soc. Powder Powder Metallurgy
J. Jpn. Soc. Powder Powder Metallurgy 45(6), 523-528, 1998-06-15
Japan Society of Powder and Powder Metallurgy