RESEARCH TO DEVELOP METHODS FOR MEASURING THE PROPERTIES OF PENETRANT FLAW INSPECTION MATERIALS.
Rept. for Mar 62-20 Nov 63,
OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS
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The work covered in this report is a continuation of the investigations reported in Parts I, II, and III. The work of Part IV was aimed particularly at measurement. Here the theoretical studies were to bo consolidated in such a manner that the results of the prior investigations could be employed to determine the success or relative success of penetrant inspection system and its materials. Measurements were made concerning the luminous emission of penetrants as well as the effect of the signals produced by developers. A simple photometer was devised to do this task simply and efficiently. It was also necessary to combine the prior theory with the present simple procedure for measurement. Production of cracked metal test specimens had to reach a final reproducible stage at which specific cracked specimens were selected to develop the needs of the measurement program. Final correlation proved the need for a greatly revised cleaning program prior to penetrant testing. At this point a standard cracked plate treatment was devised including the programs of cleaning, penetration, and washing either by emulsifier or not in a standard manner. Both parallel and random cracked specimens were employed.