N. J. Goldfine, S. Denenberg, R. Lyons, Y. Sheiretov, A. Washabaugh, Jentek Sensors, Inc., Waltham, MA; V. Zilberstein, JENTEK Sensors, Inc., Waltham, MA
As part of an ongoing U.S. Navy program to enable adaptive life management of dynamic rotorcraft components, the authors have demonstrated a rapid, low cost method for generating signature libraries of early and later stage fatigue damage in titanium alloys. This presentation describes generation of signature libraries as well as a new approach to generating early damage POD (probability of detection) curves using only a relatively limited number of coupon tests, e.g., two or three tests, thereby reducing the costs relative to the currently required numerous “simulated” or real crack specimens. The fatigue damage detection and tracking is executed using time sequenced B-scans and C-scans generated with the MWM-Array, i.e., using flexible eddy current sensing methods. The goal is to use these signature libraries, along with results from field inspections and component tests, to reduce NDT implementation costs and enable prognosis of damage evolution for condition based maintenance decision support. This will require early damage detection capability sufficient for dynamic component life management.
Summary: As part of an ongoing U.S. Navy program to enable adaptive life management of dynamic rotorcraft components, the authors have demonstrated a rapid, low cost method for generating signature libraries of early and later stage fatigue damage in titanium alloys. This presentation describes generation of signature libraries as well as a new approach to generating early damage POD (probability of detection) curves using only a relatively limited number of coupon tests, e.g., two or three tests, thereby reducing the costs relative to the currently required numerous “simulated” or real crack specimens. The fatigue damage detection and tracking is executed using time sequenced B-scans and C-scans generated with the flexible MWM-Array. The goal is to use these signature libraries, along with results from field inspections and component tests, to reduce NDT implementation costs and enable prognosis of damage evolution for condition based maintenance decision support. This will require early damage detection capability sufficient for dynamic component life management.
