Abstract
Axial stress monitoring in arbitrary cross sections is a challenging task. Stringers are the main axial load carrying components of aircraft skin structures and have typical complex cross sections. This paper investigates the strategy of axial stress monitoring in an arbitrary cross section based on acoustoelastic guided waves using piezoelectric lead zirconate titanate (PZT) sensors. To select appropriate guided wave frequencies and modes sensitive for axial stress monitoring in an arbitrary cross section, the feature guided waves are investigated using acoustoelastic theory combined with the semianalytical finite element method. The mode shapes are derived, which show that these longitudinal-like modes are more sensitive to axial stress. A PZT transducer array is also considered to maximize desired modes. Piezoelectric sensors are used to excite and detect the guided waves in the experiments. Results from acoustoelastic measurements on a T-type stringer are presented, showing the feasibility of this method for axial stress monitoring.
Highlights
The measurement of stress levels is a challenging task in the field of nondestructive testing (NDT) and structural health monitoring (SHM), relevant to arbitrary cross sections
To identify and understand guided modes existing in a stressed arbitrary cross section, acoustoelastic theory combined with the semianalytical finite element (AE-SAFE) method was applied by Wu and Yang
This paper is aimed at further development of a stress monitoring strategy based on acoustoelastic guided waves in stringerlike arbitrary cross sections using piezoelectric lead zirconate titanate (PZT) sensors
Summary
The measurement of stress levels is a challenging task in the field of nondestructive testing (NDT) and structural health monitoring (SHM), relevant to arbitrary cross sections. Less research has been focused on higher order modes for stress measurement in arbitrary cross sections because of the added complexity of considering material inelasticity in guided wave propagation. Wu and Yang developed an AE-SAFE method for investigating guided wave propagation in axial stressed arbitrary cross sections. The studies on acoustoelastic guided wave propagation in axial stressed arbitrary cross sections focused exclusively on theory and some numerical methods. The motive of this paper is to develop a strategy for axial monitoring in an arbitrary cross section based on acoustoelastic guided waves using piezoelectric sensors.
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