Small-Punch Test Apparatus for Hydrogen Embrittlement Evaluation
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Solution Overview
Problem
Current small-punch test apparatuses are inadequate for evaluating material embrittlement behavior under various gaseous hydrogen environments, particularly at low and high temperatures, which are critical for ensuring the safety of hydrogen energy equipment and components.
Innovation Solution
A small-punch test apparatus that includes a jig with upper and lower dies, an insulating container, a temperature measuring device, and a heat transfer device capable of maintaining a specimen at predetermined temperatures under high-pressure hydrogen environments, allowing for the evaluation of embrittlement behavior and fracture patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional small-punch test apparatuses are used, then the test can be performed at room temperature, but the apparatus cannot evaluate material embrittlement behavior under various gaseous hydrogen environments at low and high temperatures
Solution Approach 1:
The patent implements nesting by placing the punch test device inside an insulating container that serves as a temperature-controlled chamber. The insulating container is nested within a larger testing system that includes hydrogen gas supply equipment. This nested structure allows the apparatus to achieve temperature control capability for evaluating embrittlement at various temperatures while maintaining a relatively compact and manageable device configuration.
Solution Approach 2:
The insulating container serves multiple functions: it provides thermal insulation to maintain temperature, creates a sealed environment for hydrogen gas exposure, and acts as a chamber for both temperature control and embrittlement testing. This multi-functionality allows the apparatus to evaluate material behavior under combined thermal and hydrogen environments without requiring separate dedicated systems for each function.
2Temperature
If temperature control is added to the small-punch test apparatus, then embrittlement evaluation at various temperatures becomes possible, but the heating and cooling time becomes excessive
Solution Approach 1:
The patent applies local quality by using a heating wire that is directly attached to the specimen rather than heating the entire insulating container uniformly. This localized heating approach allows the specimen to reach the target temperature quickly while minimizing the thermal mass that needs to be heated or cooled, thereby reducing the overall temperature stabilization time.
Solution Approach 2:
The insulating container acts as an intermediary that concentrates and maintains thermal energy around the specimen. By providing excellent thermal insulation, it prevents heat loss to the surroundings, allowing the heating wire to efficiently raise the specimen temperature without requiring excessive energy input or time. The insulating container mediates between the localized heating source and the specimen, creating a controlled thermal environment.
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 quantitative assessment of material embrittlement resistance by deriving load-displacement diagrams and measuring relative thickness reduction, distinguishing ductile-brittle transition behavior, and identifying suitable materials for hydrogen energy applications.
Implementation Method 1
a heat transfer device provided at an outer peripheral surface of the jig and configured to heat or cool the specimen by means of an external heat transfer means so as to transfer heat to the specimen
Implementation Method 2
an insulating container provided to encompass the jig therein; a temperature measuring device connected to the inside of the insulating container so as to measure an internal temperature of the insulating container
Implementation Method 3
A tube connector configured to supply external gaseous hydrogen to the lower die may be penetratively connected to the insulating container and the lower die, and threaded portion may be formed at an end of the tube connector
Data Source
AI summary
The described technology can quantitatively evaluate a material embrittlement behavior under various gaseous hydrogen environments (temperature and pressure). The described technology may include a small-punch test device allowing a specimen to be fixed inside a jig comprising upper and lower dies, gas to be filled at the lower part of the specimen, and a punch for applying force to be included at the upper part thereof so as to bend the specimen in a vertical downward direction under an environment of the influent gas and measure the same. The small-punch test device also includes an insulating container provided so as to encompass the jig therein and a temperature measuring device connected to the inside of the insulating container so as to measure the internal temperature of the insulating container and the temperature of the specimen. The small-punch test device further includes a heat transfer device transferring heat to the specimen.