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Study of the Factors Affecting the Sensitivity of Liquid Penetrant Inspections: Review of Literature Published from 1970 to 1998
IOWA STATE UNIV AMES
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This report summarizes the factors that can have an effect on the sensitivity of a liquid penetrant inspection LPI. The intent of this task was to identify and organize the body of work that has led to current LPI practices. The effort involved reviewing nearly 350 abstracts and more than 100 full articles and reports that were published between 1970 and 1998. In general, only reports in the public domain have been included. An effort was made to include only information that discussed accepted scientific principles, presented test data, or introduced strong arguments supporting theories and obviations concerning the effectiveness of penetrant inspection systems. The report attempts to briefly summarize the main points of the published literature and to direct the reader to the references where they can obtain additional information. Over 40 factors have been identified that can affect the performance of a penetrant inspection. These factors include variables affected by 1 the formulation of the materials, 2 the inspection methods and techniques, 3 the process control procedures, 4 human factors, and 5 the sample and flaw characteristics. This information will be used by the Federal Aviation Administration to help guide future research efforts regarding LPI procedures.
APPROVED FOR PUBLIC RELEASE