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Life Extension of Structural Components via an Improved NDT Methodology

Life Extension of Structural Components via an Improved NDT Methodology .

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Life Extension of Structural Components via an Improved NDT Methodology

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  1. Life Extension of Structural Components via an Improved NDT Methodology The purpose of the Improved NDT Methodology is to decrease the minimum detectable flaw size while increasing the “NDT process” sensitivity and reliability for structural components, by using advanced NDT processes which utilize digital technology. The methodology takes a systems approach to NDT, and the incorporation of multiple NDT techniques (with overlapping defect inspection capabilities) in a redundant manner has resulted in improved NDT reliability. A comparison between the 3D-CT and other radiographic NDT processes was made, and the inspection data was incorporated into image analysis and probability of detection (POD) software to quantify the benefit of the advanced techniques and the effect of various sources of inspection “noise” on POD capability. The goal is to reliably extend the time in operation for structural components at or near the end of their originally intended design lives without increasing the risk of catastrophic structural failure. Daniel C. Ralph, Cornell University, ECCS - 0335765 A “Wedding Cake” specimen manufactured from 6061 Al-alloy material with various flat bottom hole (FBH) and side drilled hole (SDH) synthetic defects laser drilled into it, and image analysis software optimization. Various perspective and segmented cutaway views of the wedding cake sample. An increased amount of “noise” is apparent near the bored out center hole region. Brian P. Hohmann and Prof. T.W. Eagar, MIT Dept. of Materials Science and Engineering. Work performed at the Harvard Center for Nanoscale Systems (CNS). A turbine blade removed from operation due to defects introduced during a service weld-repair process, and front/back 3D-CT views of the reconstructed blade.

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