Internal Hydrogen Charging for Rotating Bending Fatigue Testing
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Solution Overview
Problem
Conventional hydrogen charging methods for materials are costly, prone to surface corrosion, and inefficient in long-term hydrogen embrittlement testing, while existing rotating bending fatigue testing machines fail to accurately evaluate hydrogen properties due to hydrogen dissipation during testing.
Innovation Solution
A hydrogen charging device with a circulation path and liquid pump that supplies an electrolytic solution to a test specimen, using an anode material with a spiral shape coated in a non-conductive material, and a direct-current power source to efficiently charge hydrogen, combined with a rotating bending fatigue testing machine that applies a bending moment and circulates the electrolytic solution to maintain hydrogenation during testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-pressure hydrogen gas is used for hydrogen charging, then hydrogen charging efficiency is improved, but equipment cost and complexity increase significantly
Solution Approach 1:
The patent replaces the mechanical high-pressure gas delivery system with an electrochemical system. Instead of using compressors, pressure vessels, and high-pressure piping to deliver hydrogen gas, the invention uses an electrolytic cell where water is electrolyzed to generate hydrogen atoms that directly penetrate the test specimen. This substitution eliminates complex mechanical hydrogen delivery infrastructure while maintaining effective hydrogen charging.
Solution Approach 2:
The patent introduces an electrolytic solution as an intermediary medium between the power source and the test specimen. The electrolytic cell acts as a mediator that converts electrical energy into chemical energy (hydrogen atoms) which then diffuse into the specimen. This intermediary approach avoids the need for direct high-pressure gas contact and complex gas handling equipment.
2Productivity
If hydrogen charge liquid is used for hydrogen charging, then hydrogen charging is achieved, but surface corrosion occurs and fracture origin observation becomes difficult
Solution Approach 1:
The patent extracts the harmful contact between charging medium and specimen surface by separating the hydrogen generation zone from the specimen surface. Hydrogen atoms are generated within a through-hole of the specimen by electrolysis of water, and the electrolytic solution never contacts the external specimen surface. This extraction eliminates corrosion while maintaining hydrogen charging capability through internal hydrogen atom generation and diffusion.
3Measurement precision
If test specimen is charged with hydrogen before fatigue test, then hydrogen embrittlement evaluation is possible, but hydrogen dissipates during testing leading to inaccurate evaluation
Solution Approach 1:
The patent implements continuous hydrogen charging during the entire fatigue test duration. The electrolytic cell remains active throughout the testing period, continuously generating hydrogen atoms that diffuse into the specimen to compensate for any hydrogen dissipation. This continuous action ensures constant hydrogen concentration in the specimen, enabling accurate long-term fatigue testing under hydrogen embrittlement conditions.
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
The solution enables efficient hydrogen charging and accurate evaluation of hydrogen embrittlement properties, reducing equipment costs and preventing surface corrosion, while allowing for rational material selection for hydrogen environments.
Implementation Method 1
a direct-current power source that applies a minus voltage to the test specimen, and a plus voltage to the anode material
Implementation Method 2
a circulation path and a liquid pump that circulate and supply an electrolytic solution into a through-hole provided inside a test specimen
Data Source
AI summary
The hydrogen charging device includes an anode material that can be accommodated in a through-hole provided inside a test specimen in a state of being separated from an inner peripheral surface of the through-hole, a circulation path and a liquid pump that circulate and supply an electrolytic solution into the through-hole, and a direct-current power source that applies a minus voltage to the test specimen and a plus voltage to the anode material.