Towards selective laser paint stripping using shock waves produced by laser-plasma interaction for aeronautical applications on AA 2024 based substrates

Ünaldi, Selen; Papadopoulos, Kosmas; Rondepierre, Alexandre; Rouchausse, Yann; Karanika, Alexandra; Deliane, Florent; Τσερπές, Κωνσταντίνος; Floros, Ioannis; Richaud, Emmanuel; Berthe, Laurent

doi:10.1016/j.optlastec.2021.107095

Cited by 25 publications

(25 citation statements)

References 26 publications

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“…Consider an aluminum plate covered with a layer of epoxy paint [ 11 , 12 ] ( Figure 1 ). The laser is applied on the aluminum side.…”

Section: Problem Statement and Approachmentioning

confidence: 99%

“…The study is focused on how the shock wave initiates fracture and spall fracture of the interface and in some cases how this fracture propagates with time. This will be realized via analytical and numerical models, while experiments conducted in [ 11 ] will be used as a basis for the validation and calibration of the models.…”

Section: Problem Statement and Approachmentioning

confidence: 99%

“…In addition to the above applications, the laser shock can be used for paint stripping of aeronautical and aerospace structures [ 11 , 12 ] which fundamentally differs from laser paint stripping in the use of thermal effects for ablation of paint [ 13 , 14 ]. In conventional paint stripping, hazardous chemicals and media blasting are used, thus damaging the substrate.…”

Section: Introductionmentioning

confidence: 99%

“…Section 2 describes the specimen, the loading, and the shock wave propagation inside the material system. In Section 3 , the experimental setup used in [ 11 ] to conduct the LSPS tests is briefly presented. Section 4 describes the FE model including the CZM module, Section 5 the analytical stress analysis model, and Section 6 the spall fracture model.…”

Section: Introductionmentioning

confidence: 99%

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Analytical and Numerical Modeling of Stress Field and Fracture in Aluminum/Epoxy Interface Subjected to Laser Shock Wave: Application to Paint Stripping

Papadopoulos

Τσερπές

2022

Materials

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In this paper, analytical and numerical models have been developed to compute the stress field and predict fracture of the aluminum/epoxy interface subjected to laser shock loading, in the frame of the investigation of the paint stripping process. An explicit finite element (FE) model combined with the cohesive zone modeling (CZM) method, an analytical stress analysis model, and a spall fracture model have been developed. The numerical model has been calibrated and validated against tests in terms of the stripping pattern, while the analytical models have been compared with the numerical model. The models were combined to generate computational tools for decreasing computational effort. The FE model with the CZM is the most accurate tool although it is the most computationally expensive. The spall fracture model gives trusted estimations of the spall strength of the interface which are very sensitive to the interface thickness and when incorporated into a continuum FE-based damage model can predict the stripping initiation faster than the FE model with the CZM. The analytical stress analysis model can be used to efficiently describe the shock wave propagation into the material system, but it can give only a rough estimation of the tensile stress at the epoxy, which when combined with the spall strength does not give reliable predictions of the stripping initiation. The three models require as input different material properties, some of which are very difficult to determine. Nevertheless, the availability of accurate material parameters and properties of the aluminum, the epoxy, and, especially, their interface can significantly improve the efficiency of the developed models.

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“…Consider an aluminum plate covered with a layer of epoxy paint [ 11 , 12 ] ( Figure 1 ). The laser is applied on the aluminum side.…”

Section: Problem Statement and Approachmentioning

confidence: 99%

Section: Problem Statement and Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analytical and Numerical Modeling of Stress Field and Fracture in Aluminum/Epoxy Interface Subjected to Laser Shock Wave: Application to Paint Stripping

Papadopoulos

Τσερπές

2022

Materials

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“…The laser spot diameters used for the experiments are 0.7 and 1.2 mm. A Diffractive Optical Element (DOE) was used to homogenize the beam energy distribution [13,14]. The laser intensities used ranged from 1.4 to 10.9 GW/cm².…”

Section: Lasermentioning

confidence: 99%

Novel Confinement Possibility for Laser Shock: Use of Flexible Polymer Confinement at 1064 nm Wavelength

Bras

Rondepierre

Ayad

et al. 2021

Metals

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Through the years, laser shock peening became a treatment of choice in the aerospace industry to prolong the life of certain critical pieces. Water flow is commonly used as a confinement to improve the process capability but some applications cannot allow for water presence in the area of interest. In a previous article, an alternative to the water confinement was presented, a flexible polymer confinement was used and demonstrated the production of pressures equivalent to the water configuration treatment. However, laser parameters have been restricted to a wavelength in the visible range at 532 nm. In this paper, the study is extended to 1064 nm which is commonly used in LSP applications and with two different pulse durations. A 1064 nm near infra-red laser is used to do pressure characterization of shots with polymer confinement through Velocity Interferometer System for Any Reflector (VISAR) measurements coupled with Finite Element Modelling on Abaqus software. The results show that the pressures produced by the confinement is slightly lower with the 1064 nm wavelength, similar to what is observed with the classic water confined regime when switching from 532 nm to a near infra-red wavelength. Nevertheless, the high level of pressure produced by laser shock under the polymer confinement configuration allows for the treatment of common types of metal alloys used in the aerospace industry. Although the use of such a confinement has yet to be applicable to peening setups, it has already uses in some single shot configurations such as LasAT where it allows the avoidance of the water flow optimization.

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Effect of nanosecond laser pulse width and energy on damage characteristics in carbon fibre reinforced plastic (CFRP) laminates

Qu,

Song,

Wen

et al. 2024

Polymer Composites

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This study explores the effects of laser pulse width and energy on CFRP laminates damage in laser bond inspection technology. Three testing programs were used, including varying laser energy while keeping pulse width constant, altering pulse width while maintaining constant power density, and modifying pulse width while keeping energy constant. The results show that when the pulse width remains constant, increased laser energy has a minimal effect on the initial damage location but leads to gradual interlayer delamination and fiber fracture propagation toward the impact surface. With constant laser energy, a specific threshold for pulse width is observed. When the laser pulse width is below this threshold, it exhibits a positive correlation with the damage characteristics of CFRP laminates, whereas when it exceeds this threshold, it shows a negative correlation. Power density correlates with damage when pulse width is constant, but there is no direct correlation when pulse width varies.Highlights CFRP laminates underwent laser shock tests with varying pulse widths. Power density is positively correlated with damage under specific conditions. There exists a specific threshold for laser pulse width. In single‐sided laser shock, initial damage spreads within a specified range.

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Towards selective laser paint stripping using shock waves produced by laser-plasma interaction for aeronautical applications on AA 2024 based substrates

Cited by 25 publications

References 26 publications

Analytical and Numerical Modeling of Stress Field and Fracture in Aluminum/Epoxy Interface Subjected to Laser Shock Wave: Application to Paint Stripping

Analytical and Numerical Modeling of Stress Field and Fracture in Aluminum/Epoxy Interface Subjected to Laser Shock Wave: Application to Paint Stripping

Novel Confinement Possibility for Laser Shock: Use of Flexible Polymer Confinement at 1064 nm Wavelength

Effect of nanosecond laser pulse width and energy on damage characteristics in carbon fibre reinforced plastic (CFRP) laminates

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