Abstract

Abstract : The report developed under STTR contract presents the results of work performed on development of a new probabilistic model for reliability assessment of the aging aircraft structural components and nonlinear acoustic instrumentation for collecting the input data for reliability model. The reliability of aging components is estimated on the basis of crack propagator concept CP (probability of crack extension from one position to the next during specified time interval). Monte Carlo Simulation is employed for numerical realization. parameters of CP can be evaluated and experimentally verified by nonlinear acoustic technique and instrumentation. This instrumentation uses the interaction of ultrasonic waves with vibration (Nonlinear Elastic Wave Spectroscopy - NEWS). High sensitivity of nonlinear acoustic technique for crack detection and location was demonstrated for different class of materials: polycarbonate, steel, aluminum, adhesive bonded aluminum plates. This technique allows to estimate crack size and location that are the input parameters for the reliability model. Draft design of the instrumentation has been also developed. Phase II will pursuer advanced development of reliability model. The stationary and in-field usage nonlinear instrumentation prototypes and software will be developed for lifetime and quantitative reliability assessment of the aging structure components.

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