Abstract
Online and offline monitoring of composite bolted joints under tensile load were investigated using piezoelectric transducers. The relationships between Lamb wave signals, pre-tightening force, the applied tensile load, as well as the failure modes were investigated. Results indicated that S0/A0 wave amplitudes decrease with the increasing of load. Relationships between damage features and S0/A0 mode were built based on the finite element (FE) simulation and experimental results. The possibility of application of Lamb wave-based structure health monitoring in bolted joint-like composite structures was thus achieved.
Highlights
The need for stronger and lighter structures in the fields of aerospace, ship engineering, and the automotive industry has driven the use of composite structures
Even though the structure length can be as long as a hundred meters, the maximum dimension of an integrative composite structure is limited into approximately 20 m in length by the manufacturing process, such as the commonly used resin transfer molding (RTM) method [1,2]
Were wafers, and they had a circular shape with a diameter of mm, and a thickness of and piezoelectric (PZT) wafers, and they had a circular shape with a diameter of 10 mm, a thickness transducers were bonded on the were surface of the composite boltedofjoints using cyanoacrylate adhesive
Summary
The need for stronger and lighter structures in the fields of aerospace, ship engineering, and the automotive industry has driven the use of composite structures. Materials 2017, 10, 652 of defects in simple thin-walled composite laminates have been studied extensively [13,14,15], research on the inspection of complex composite assemblies using Lamb wave-based systems is still insufficient. Zhou et al [16] investigated the geometric parameter influence on the failure mode of composite single lap bolted joints. Guided wave technology has been successfully employed for damage detection in bonded joints [22,23,24,25,26,27]. Guided wave propagation characteristics in bonded composite structures were investigated by Deng et al [25]. Very few references concerned the application of Lamb wave-based SHM technology to monitor the damages in composite bolted joints. All the input parameters in the simulation were determined experimentally by fundamental mechanical tests
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