In-strike dynamical measurements of contact resistances

Lepetit, Bruno; Revel, I.; Peres, Gilles; Andrivet, Luc; Flourens, F.

doi:10.1109/iclp.2010.7845944

Cited by 7 publications

(10 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The pulse current injected in the assembly during a test was representative of the waveform current recorded during in-flight measurements [8,9]. More details concerning this work are available in previous publications [6,7]. These measurements have been used in the present study to calculate the total electrical energy deposited inside the bolt and the surrounding materials.…”

Section: Total Electrical Energy Inputmentioning

confidence: 99%

“…As the aim of the present work is the estimation of the order of magnitude of the overpressure inside the confined volume around the fastener, the energy balance will be focused on a single tested sample [6,7]. The recorded current intensity I bolt-rib between the bolt and the rib for this sample is reported in Figure 5.…”

Section: Total Electrical Energy Inputmentioning

confidence: 99%

“…U arc is determined from electrical measurements. An electrical model of the tested sample assembly (bolt, skin and rib) together with current measurements between bolt and rib, and bolt and skin allow us to evaluate the arc voltage (see [7] for calculation details).…”

Section: Total Electrical Energy Inputmentioning

confidence: 99%

“…It should be noted that this confined volume value around the bolt (70 mm 3 ) is higher for the studied sample compared to a real bolt fastener assembly on an aircraft. Indeed, for the test campaign previously performed by Airbus Group [6,7], the distance between bolt and rib was voluntarily slightly increased to facilitate the arc ignition during the tests. 5) The plasma composition and the specific internal energy U m (J/kg) as a function of mixture, temperature and total mass density ρ of the plasma.…”

Section: -P9mentioning

confidence: 99%

“…The aim of the present study is the development of a theoretical model coupled with experimental electrical inputs to realise an energy balance and to calculate the internal pressure build-up. First, we extract from a previous experimental campaign [6,7] an estimate of the electrical energy injected. Then we describe our thermo-physical model for material ablation and plasma formation, allowing us to relate the internal energy of the medium to its chemical and physical properties (composition, physical state, pressure, etc.).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Energy balance and assessment of the pressure build-up around a bolt fastener due to sparking during a lightning impact

Teulet

Billoux

Cressault

et al. 2017

Eur. Phys. J. Appl. Phys.

Self Cite

View full text Add to dashboard Cite

This work is devoted to the calculation of the energy balance associated with the formation of an electric arc between the bolt shank and an inner structural part of the fuselage during a lightning strike. Assessment of the pressure build-up in the confined volume around the bolt fastener has also been performed. This pressure rise comes from the temperature increase and from the mass density increase (melting and vaporisation of materials). Previous electrical measurements performed by Airbus Group during a lightning test campaign have been used to calculate the total available electrical energy. The energies necessary for melting and vaporisation of bolt and rib are derived from thermodynamic properties of aluminium and titanium. A numerical code has been developed to determine the chemical composition (under the local thermodynamic equilibrium [LTE] assumption) and the internal energy of the plasma for air-Al/Ti mixtures. Plasma and material radiation losses and heat conduction losses have also been evaluated. Finally, an analytical model has been implemented to determine the overpressure as a function of the deposited electrical energy, the energy involved in the arc formation, the energy necessary for melting and the plasma composition and mass density. With this approach, maximum pressure values are in the range 200–330 bars.

show abstract

Section: Total Electrical Energy Inputmentioning

confidence: 99%

Section: Total Electrical Energy Inputmentioning

confidence: 99%

Section: Total Electrical Energy Inputmentioning

confidence: 99%

Section: -P9mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Energy balance and assessment of the pressure build-up around a bolt fastener due to sparking during a lightning impact

Teulet

Billoux

Cressault

et al. 2017

Eur. Phys. J. Appl. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

The prediction model for resistance of composite interference‐fit joint subjected to current strike

Zhu,

Cheng,

Bai

et al. 2023

Polymer Composites

View full text Add to dashboard Cite

Composite interference‐fit joints are widely used in aerospace due to their reliability and load‐bearing capacity. However, they are vulnerable to lightning damage. This analyzes the prediction resistance model of a composite interference‐fit joint subjected to a current strike, focusing on electrical conductivity. Analyzing various lightning strike stages, the study establishes analytical expressions for the initial resistance related to interference‐fit size and structural dimensions before the lightning strike. Additionally, the dynamic resistance change after the lightning strike is investigated, considering the influence of the current waveform. Non‐destructive tests are employed for verification and refinement. The findings reveal a correlation between the initial resistance and the interference‐fit size in pre‐strike stage, while both the interference‐fit size and the peak current influence the equivalent resistance under low lightning current conditions. Notably, an intermediate interference‐fit size provides a substantial protective gain for the composite connection. This approach eliminates the need for destructive tests and offers a dependable data reference for aircraft component assembly.

show abstract

Efficient method for the computation of lightning current distributions in wind turbine blades using the Fourier transform and the finite element method

Laudani

Carloni²,

Thomsen³

et al. 2020

IET Science, Measurement & Technology

View full text Add to dashboard Cite

Rotor blades of large, modern wind turbines are susceptible to lightning strikes. In order to produce a design that resists lightning strikes, it is crucial to simulate lightning current propagation in the blade components. Since the current in the blade is generated by the superposition of potential and induced electric fields, a coupling exists between electric and magnetic fields which needs to be calculated by an imposed integral constraint at each time step. Commercial software packages are able to deal with such constraints, but it results in time-consuming computations. Therefore, this work aims to develop a numerical methodology able to compute the voltage which drives the lightning current through the structure. In this way, the problem is reformulated as a voltage-driven one which in turn allows a simple subsequent coupling of electric and magnetic problems. The computation of the voltage waveform was accomplished using the Fast Fourier Transform (FFT) and the Finite Element Method (FEM) to compute the structure impedance in the frequencydomain. The developed procedure showed high efficiency for a blade subjected to different lightning impulses. It allows a description of the time-dependent lightning current to be given, as well as the distribution of current within the blade conductors.

show abstract

In-strike dynamical measurements of contact resistances

Cited by 7 publications

References 3 publications

Energy balance and assessment of the pressure build-up around a bolt fastener due to sparking during a lightning impact

Energy balance and assessment of the pressure build-up around a bolt fastener due to sparking during a lightning impact

The prediction model for resistance of composite interference‐fit joint subjected to current strike

Efficient method for the computation of lightning current distributions in wind turbine blades using the Fourier transform and the finite element method

Contact Info

Product

Resources

About