Portable Laser Machining for Residual Stress Analysis
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Solution Overview
Problem
Current methods for measuring residual stresses in materials are often inaccurate and require laboratory settings, especially when dealing with components having hard surfaces, as traditional machining techniques can alter the stress state and introduce errors.
Innovation Solution
A portable machining system that combines laser ablation with mechanical machining to minimize stress alteration, allowing for precise cutting and stress relief features on hard surfaces, using a hybrid approach with a laser machining head and mechanical cutting tool for enhanced accuracy and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional mechanical machining is used on hard surfaces, then material removal is achieved, but residual stress state is altered and measurement accuracy deteriorates
Solution Approach 1:
The patent replaces traditional mechanical machining with laser ablation technology. The laser beam removes material through thermal vaporization rather than mechanical cutting, eliminating the high contact forces that alter residual stress states. This substitution enables accurate stress measurement on hard surfaces while preserving the original stress integrity.
Solution Approach 2:
The patent changes the fundamental machining parameter from mechanical force to thermal energy. By using laser ablation, the material removal process operates at a different physical regime (thermal vs. mechanical), allowing precise control of material removal depth and shape without introducing the high stresses associated with conventional mechanical cutting of hard materials.
2Measurement precision
If components are moved to remote laboratory facilities for analysis, then comprehensive testing can be performed, but time delays and costs increase
Solution Approach 1:
The patent makes the measurement system portable and self-contained, bringing the laboratory capability to the component rather than requiring component transport. The portable laser machining system with integrated strain measurement equipment can perform complete residual stress analysis on-site, eliminating the need for external laboratory facilities and associated time delays.
Solution Approach 2:
The patent creates a universal measurement system that can be deployed in multiple locations (field, laboratory, manufacturing site). The portable apparatus combines laser ablation, strain gauge application, and data acquisition into a single multi-functional unit that performs complete residual stress analysis regardless of location, making the system adaptable to various testing environments.
3Ease of manufacture
If representative samples are used in the laboratory, then testing is simplified, but data accuracy and reliability deteriorate
Solution Approach 1:
The patent extracts the measurement capability from the laboratory environment and applies it directly to the actual component in service or at the manufacturing location. By using the portable system on the real component rather than samples, the method obtains accurate stress data from the actual part while maintaining operational simplicity through automated laser ablation and digital strain measurement.
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
Enables high-accuracy residual stress measurement directly on-site without laboratory relocation, reducing errors and improving the reliability of stress analysis on components with hard surfaces.
Implementation Method 1
A portable machining system that combines laser ablation with mechanical machining to minimize stress alteration
Implementation Method 2
A portable machining system that combines laser ablation with mechanical machining to minimize stress alteration
Data Source
AI summary
Analysis of residual stress in materials is often done in static conditions in a laboratory. Accurate systems and methods for performing these analyses in a dynamic, non-laboratory environment are notoriously difficult and can be very inaccurate. A method using a portable, field deployable apparatus having greater accuracy than currently available is disclosed whereby accurate and repeatable residual stress analysis may be implemented in non-laboratory environments leading to greatly improved diagnostics, maintenance and life limit prediction. A laser cutting system is provided to cut through hardened surface layers to minimize machining stresses from mechanically cutting through a hardened layer.