Automation of Measuring Fracture Surface Area and Shortening of Measuring Time for Hard Materials.

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  • Automation of Measuring Fracture Surfac

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The tedious manual procedures and long time needed for the measuring of Smf which is the main process in our proposed method for estimating fracture toughness (KIC) of hard materials by using our proposed equation ofσm=ψKICSmf1/2(σm is the bending fracture strength, ψ is a factor and Smf 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 Smf 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 Smf for WC-10mass%Co cemented carbide was shortened by the automations to be about 24% of the one needed in the previous manual method.

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