3D Paint Layer Deformation Mapping During Crosslinking
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Solution Overview
Problem
The polymerization or crosslinking of paint layers on aircraft structures is incomplete upon delivery, leading to sensitivity to thermal stress, UV radiation, and oxidation, resulting in defects like cracking and blistering due to independent evolution of molecular chains.
Innovation Solution
A method involving three-dimensional tomographic measurement and dynamic mechanical analysis to determine the deformation field of paint layers during crosslinking, using X-ray microtomography and digital volume correlation to monitor layer evolution and identify responsible layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If layers of paint are applied and allowed to dry by polymerization at ambient temperature between each layer, then the painting process can be completed with multiple layers, but the total cycle time becomes around three weeks
Solution Approach 1:
The patent applies heating to accelerate the polymerization process of paint layers. By changing the temperature parameter from ambient to elevated temperatures (e.g., 50-150°C), the drying time is significantly reduced while maintaining complete polymerization. This resolves the contradiction by enabling multi-layer painting with faster cycle times through controlled thermal parameter changes.
2Loss of time
If the aircraft is delivered before complete polymerization of paint layers, then delivery time is reduced, but the layers become sensitive to thermal stress, UV radiation, and oxidation causing defects
Solution Approach 1:
The patent performs preliminary heating treatment before delivery to ensure complete or near-complete polymerization of all paint layers. By applying heat in advance (e.g., in an oven or heating chamber), the molecular chains are fixed and crosslinking is completed, making the layers thermostable and resistant to environmental factors. This preliminary action prevents future defects while enabling timely delivery.
Solution Approach 2:
The patent utilizes the phase transition from viscous/uncrosslinked state to solid/crosslinked state through controlled heating. By raising the temperature, the polymerization reaction proceeds to completion, transforming the paint layers from a vulnerable state to a stable, defect-resistant state. This phase transition ensures reliability before delivery.
3Reliability
If complete polymerization is achieved through extended drying time, then layer stability is improved, but manufacturing time increases significantly
Solution Approach 1:
The patent changes the temperature parameter during the polymerization process to accelerate the reaction. By heating the painted structure to elevated temperatures (50-150°C), the polymerization kinetics are enhanced, achieving complete crosslinking in hours rather than weeks. This parameter change simultaneously improves layer stability and maintains high manufacturing efficiency.
Solution Approach 2:
The patent employs periodic heating cycles with controlled temperature ramps and holding periods. This periodic thermal action ensures complete polymerization while optimizing energy consumption and process time. The cyclic heating pattern achieves full crosslinking efficiently, balancing reliability and productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces manufacturing time by identifying defect-causing layers, allowing for optimized application processes and chemical formula adjustments to prevent excessive deformations, ensuring stable layer configurations.
Implementation Method 1
a first step of three-dimensional tomographic measurement of the sample so as to obtain a first three-dimensional image of the sample
Implementation Method 2
a first sub-step of determining a displacement field between the first image and the second image by digital volume correlation
Data Source
AI summary
A method for determining a deformation field of at least one layer of paint applied to a support during crosslinking of the layer or the layers of paint is disclosed. The method includes a step (E1) of provision of a sample, a step (E2) of 3D tomographic measurement of the sample and a set of successive steps(S) repeated iteratively comprising a step (E3) of dynamic mechanical analysis of the sample subjected to at least one temperature cycle (C), a step (E4) of 3D tomographic measurement of the sample, a step (E5) of determining a deformation field of each layer of paint of the sample.