Finite element simulation of core inspection in helicopter rotor blades using guided waves

Chakrapani, Sunil Kishore; Barnard, Daniel J.; Dayal, Vinay

doi:10.1016/j.ultras.2015.05.009

Cited by 5 publications

(4 citation statements)

References 29 publications

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“…The A 0 mode and S 0 mode have respectively a group velocity of approximately 1000 m/s and 4500 m/s (Figure 7a) at low frequencies (non-dispersive region), which is in good agreement with the values expected from the literature [3,7,10,13,27,30]. However, higher velocities were expected according to the theoretical dispersion curves plotted in Figure 2.…”

Section: The Dispersion Curves Plotted Insupporting

confidence: 88%

Damage Detection in a Composite T-Joint using Guided Lamb Waves

Philibert

Wang

Yao

et al. 2017

Structural Health Monitoring 2017

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Low velocity impact induces barely visible damage in the form of matrix cracking or delamination that can grow under hydro-thermo-mechanical loading and possibly lead to catastrophic failure if not detected at an early stage. A network of piezoelectric transducers can be used to monitor a structure over time for life prognosis through generation and sensing of guided ultrasonic waves. The aim of this study is to design and develop such a sensing method for damage assessment in a composite T-joint subjected to mechanical impacts. In this context, monitoring of Lamb waves in a carbon fibre reinforced polymer (CFRP) T-joint has been completed where dispersion and tuning curves have been obtained. Guided waves are transmitted into the structure through different specified pairs of surface-bonded lead-zirconate-titanate (PZT) transducers in a pitch-catch active structural health monitoring (SHM) approach. With these experiments, Lamb wave fundamental modes (A 0 and S 0) are identified for monitoring impact damage by signal comparison with a prior obtained baseline. Detecting 4J and 10J inner impacts within the central region of the specimen is challenging when using conventional non-destructive techniques (NDT) because of the complex geometry and interference with the web. Signals are compared for the same selected sensing path; and amplitude differences have been observed in tuning curves after the 10J impact, which implies the occurrence of a structural change related to the impact.

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Section: The Dispersion Curves Plotted Insupporting

confidence: 88%

Damage Detection in a Composite T-Joint using Guided Lamb Waves

Philibert

Wang

Yao

et al. 2017

Structural Health Monitoring 2017

View full text Add to dashboard Cite

show abstract

supporting

confidence: 89%

“…Lamb waves are scattered by discontinuities and may generate new modes. These new generated modes can come from cracks or debonding or from structural discontinuity observed in C, I, or T shaped composite structures used in helicopter rotor blades, aircraft wings, or wind turbines [8][9][10]. Both A 0 and S 0 modes exhibit mode conversion to S 0 mode and A 0 mode respectively when interacting with a discontinuity [8,[11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Damage Detection in a Composite T-Joint Using Guided Lamb Waves

et al. 2018

View full text Add to dashboard Cite

Low velocity impact induces barely visible damage in the form of matrix cracking or delamination that can grow under hydro-thermo-mechanical loading and possibly lead to catastrophic failure if not detected at an early stage. A network of piezoelectric transducers can be used to monitor a structure over time for life prognosis through generation and sensing of guided ultrasonic waves. The aim of this study is to design and develop such a sensing method for damage assessment in a composite T-joint subjected to mechanical impacts. In this context, monitoring of Lamb waves in a carbon fibre reinforced polymer (CFRP) T-joint has been completed where dispersion and tuning curves have been obtained. Guided waves are transmitted into the structure through different specified pairs of surface-bonded lead-zirconate-titanate (PZT) transducers in a pitch-catch active structural health monitoring (SHM) approach. With these experiments, Lamb wave fundamental modes (A 0 and S 0 ) are identified for monitoring impact damage by signal comparison with a prior obtained baseline. Detecting 4J and 10J inner impacts within the central region of the specimen is challenging when using conventional non-destructive techniques (NDT) because of the complex geometry and interference with the web. Signals are compared for the same selected sensing path; and amplitude differences have been observed in tuning curves after the 10J impact, which implies the occurrence of a structural change related to the impact.

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“…The core of the sandwich structure can have constant or non-constant thickness. Curved or complex-shaped panels found applications as well [9].…”

Section: Introductionmentioning

confidence: 99%

Testing of the heating element integrated into the honeycomb sandwich structure for active thermography inspection

Triska

Chlebeček

Hnidka

et al. 2020

Jnl of Sandwich Structures & Materials

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The honeycomb sandwich structures with carbon composite face sheets combined with aluminium or Nomex® honeycomb core are extensively used in the aircraft airframe structure. They provide some key benefits over conventional structures such as increased bending strength and stiffness combined with low weight. However, they show high sensitivity to a certain type of damage, such as object impact, mishandling, etc. Non-destructive inspection methods are needed for a structural health examination. Active infrared thermography is one of them. The quality of the inspection and defect detection depends heavily on the proper application of the external thermal excitation. This paper presents a concept of the sandwich structure with internal excitation by means of an integrated thin-film resistive heating element.

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Finite element simulation of core inspection in helicopter rotor blades using guided waves

Cited by 5 publications

References 29 publications

Damage Detection in a Composite T-Joint using Guided Lamb Waves

Damage Detection in a Composite T-Joint using Guided Lamb Waves

Damage Detection in a Composite T-Joint Using Guided Lamb Waves

Testing of the heating element integrated into the honeycomb sandwich structure for active thermography inspection

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