Electrical Pulse-Laser Shock Coupling for Uniform Material Strengthening
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Solution Overview
Problem
Existing laser shock peening technologies face challenges in achieving uniformity and stability due to the lack of real-time synchronization between electrical pulses and laser shock waves, leading to inadequate surface roughness, stress concentration, and low grain refinement, which limits the effectiveness of material strengthening.
Innovation Solution
A method is developed to synchronize electrical pulses and laser shock waves by adjusting their initial times, frequencies, and workpiece movement speed, ensuring real-time coupling through specific waveform adjustments and parameters, such as frequency ratios, pulse widths, and current amplitudes, to enhance material strengthening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If electrical pulses and laser shock waves are used without real-time synchronization, then the strengthening effect can be applied, but the uniformity and stability of the effect deteriorates
Solution Approach 1:
The patent implements real-time synchronization between electrical pulse generator and laser shock wave generator through feedback control mechanisms. The control system monitors the timing and parameters of both electrical pulses and laser pulses, adjusting them dynamically to ensure precise coupling. This feedback mechanism ensures that electrical pulses and laser shock waves are consistently synchronized throughout the processing operation, eliminating the uniformity and stability problems caused by unsynchronized treatment.
2Area of stationary object
If large-area overlapping LSP is performed, then the coverage area increases, but the surface roughness increases and stress concentration risk increases
Solution Approach 1:
The patent changes key parameters of the LSP process by introducing electrical pulse assistance. The electrical pulses modify the material's flow stress characteristics, allowing for different laser parameter settings that reduce surface roughness. By adjusting the electrical pulse parameters (amplitude, duration, frequency) in combination with laser parameters, the process achieves large-area coverage while maintaining better surface quality and reducing stress concentration risks through the combined electro-plastic and shock wave effects.
3Device complexity
If conventional LSP is used, then the process is simple, but the compressive residual stress layer is thin and grain refinement degree is low
Solution Approach 1:
The patent merges two strengthening mechanisms: electrical pulse assistance and laser shock peening. The electrical pulse generator is integrated with the laser shock wave generator, creating a combined treatment system. The electrical pulses induce electro-plastic effects that work synergistically with the laser-induced shock waves, producing deeper compressive residual stress layers and enhanced grain refinement. This merged approach maintains operational simplicity while significantly improving the depth and effectiveness of the strengthening layer.
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 approach significantly improves material strength, plasticity, and fatigue resistance by creating a deeper compressive residual stress layer, achieving uniform large-area strengthening and increased surface hardness.
Implementation Method 1
Electric current can improve the formability and plasticity of materials by reducing the flow stress, which is called electroplasticity
Implementation Method 2
Laser shock peening/processing (LSP) is to form shock waves on the surface of a material by using laser beams to improve the fatigue resistance of the material
Implementation Method 3
the pulse current plays an important role in crack healing of the materials
Data Source
AI summary
A method of strengthening through real-time coupling of electrical pulses and laser shock waves is provided. The initial time and duration of the electrical pulses are controlled to be matched with the initial time and duration of the laser shock waves, so that the electrical pulses and the laser shock waves are coupled in real time for material strengthening, the plasticity and the strength of the material are greatly improved, and a large area of the workpiece is uniformly strengthened. By simultaneously introducing the electrical pulses into the pulse current-assisted LSP, a great strengthening effect is achieved through the combination of the electrical pulses and the pulse current-assisted LSP in a short time, thereby reducing the internal defects of the material to a certain extent and further increasing the fatigue life of the material.