Liquid-Constrained Laser Shock Peening for Uniform Residual Stress
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Solution Overview
Problem
The existing laser shock peening technology often results in uneven residual stress distribution on material surfaces due to the 'residual stress hole' phenomenon, which adversely affects the material's performance.
Innovation Solution
A single-beam double-physical-effect coordinating and distributing method is introduced, which involves determining the residual stress distribution state under solid and liquid constraint conditions, adjusting the liquid constraint layer features to optimize the intensity ratio of 'plasma shock' to 'cavitation' effects, and applying these adjustments to achieve uniform laser shock peening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional laser shock peening technology is used, then high shock pressure can be generated, but uneven residual stress distribution occurs due to the 'residual stress hole' phenomenon
Solution Approach 1:
The patent changes the physical state of the constraint layer from solid to liquid, and adjusts liquid parameters (type, thickness, temperature) to control the plasma shock and cavitation effects. This parameter change eliminates the residual stress hole while maintaining high shock pressure, resolving the contradiction between force generation and stress distribution uniformity
Solution Approach 2:
The patent creates a composite constraint system combining liquid constraint layer and absorption layer. The liquid constraint layer generates both plasma shock and cavitation effects, while the absorption layer converts laser energy to heat. This composite structure achieves uniform residual stress distribution while maintaining high shock pressure
2Manufacturing precision
If liquid constraint layer is used to eliminate residual stress hole, then uniform residual stress distribution is achieved, but precise control of plasma shock and cavitation intensity ratio becomes difficult
Solution Approach 1:
The patent identifies key liquid constraint layer parameters (thickness, temperature, liquid type) that directly control the intensity ratio of plasma shock to cavitation effects. By adjusting these parameters, precise control is achieved without complex control systems, eliminating the contradiction between uniformity and control complexity
Solution Approach 2:
The patent establishes a feedback mechanism where residual stress distribution is measured and used to adjust liquid constraint layer parameters. This feedback loop enables precise control of the plasma shock and cavitation intensity ratio, resolving the contradiction between uniformity achievement and control simplicity
3Manufacturing precision
If multiple processing parameters are adjusted to achieve uniform peening, then processing quality improves, but processing time and complexity increase
Solution Approach 1:
The patent identifies the liquid constraint layer parameters (thickness, temperature, type) as the key control variables that directly affect peening uniformity. By focusing adjustment on these few critical parameters rather than multiple parameters, the patent achieves uniform peening quickly, resolving the contradiction between quality and processing time
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
This method effectively minimizes the 'residual stress hole' effect by systematically setting absorption layer feature parameters, allowing for mass production of laser shock peening technologies that uniformly distribute residual stress, enhancing material performance.
Implementation Method 1
Pulse laser will lead to plasma explosion on a surface of a material, so as to form GPa order of magnitude of shock pressure
Implementation Method 2
a phenomenon of 'residual stress hole' always occurs on a surface of a target material... uniform peening or modification of the surface of the material is achieved through distribution of an occurring intensity of these two physical effects
Data Source
AI summary
The present invention provides a single-beam double-physical-effect coordinating and distributing method applicable to uniform laser shock and application thereof, and belongs to the technical field of laser shock effect control. The present invention does not stipulate the specific adjusting and distributing mean, and only provides a coordinating principle and method. The present invention gives a universal and systematic method for setting absorption layer feature parameters applicable to mass laser shock uniform peening under a liquid constraint condition, so as to facilitate the relevant technician to quickly obtain the liquid constraint laser shock processing technology conforming to a distribution proportion of its double physical effects, thereby being beneficial to development and application of the laser shock peening treatment, and therefore having the good actual application value.