How to evaluate the performance of Nonstandard Spherical Pad in extreme conditions?

Evaluating the performance of nonstandard spherical pads under extreme conditions is a complex and critical task, especially when it comes to harsh working conditions such as high temperature, high pressure, chemical corrosion or vibration. The following details how to conduct the evaluation in terms of test methods, evaluation indicators, simulated environment and data analysis.

Define the definition of extreme conditions
Temperature range: Determine the lowest and highest temperatures that the gasket may face, such as low temperature to -200°C or high temperature to 800°C.
Pressure range: Evaluate the sealing performance of the gasket under different pressures, including static pressure and dynamic pressure changes.
Chemical environment: Consider the type of media that the gasket contacts, such as acid, alkaline, organic solvents or other corrosive substances.
Mechanical load: Analyze the behavior of the gasket under vibration, shock or long-term compression.
Other factors: Such as humidity, UV radiation, vacuum or high altitude environment.
Choose the right test method
According to the specific extreme conditions, choose the right test method to evaluate the performance of the gasket:
Sealing test
Air tightness test: Use a helium mass spectrometer or other gas leak detection equipment to measure the gas leakage rate of the gasket under high pressure.
Liquid tightness test: Use water or a specific liquid medium to check whether the gasket leaks under a set pressure.
Vacuum sealing test: Place the gasket in a vacuum environment to evaluate its sealing ability under low pressure conditions.
Temperature resistance test
High temperature aging test: Expose the gasket to a high temperature environment for a period of time (such as 72 hours) to observe its dimensional changes, hardness changes and surface damage.
Thermal cycle test: Simulate temperature fluctuations (such as repeated cycles from -40°C to 200°C) to evaluate the stability of the gasket in temperature changes.
Pressure resistance test

Static pressure test: Apply constant pressure and record the deformation and sealing performance of the gasket.
Burst pressure test: Gradually increase the pressure until the gasket fails to determine its ultimate pressure bearing capacity.
Chemical resistance test
Immerse the gasket in the target medium (such as sulfuric acid, hydrochloric acid, gasoline, etc.) and observe its chemical degradation within a certain period of time, including weight change, dimensional change and mechanical property degradation.
Mechanical property test
Compression rebound test: Evaluate the recovery ability of the gasket after compression.
Fatigue test: Simulate long-term vibration or periodic load to observe the fatigue life of the gasket.
Impact resistance test: Use an impact tester to evaluate the performance of the gasket when it is suddenly stressed.
Establish a simulated environment
Experimental device design: Design special test equipment according to actual working conditions, such as high-temperature autoclaves, corrosion test chambers or vibration tables.
Multi-factor coupling test: Some extreme conditions may exist at the same time (such as high temperature + high pressure + corrosion), and a comprehensive test plan needs to be designed to simulate the real environment.
Accelerated aging test: By increasing temperature, pressure or concentration, the test time is shortened and the long-term performance of the gasket is quickly evaluated.
Evaluation key indicators
During the test, the following key indicators need to be paid attention to:
Dimensional stability: Evaluate the expansion, contraction or deformation of the gasket under extreme conditions.
Sealing performance: measure leakage rate or sealing integrity.
Mechanical strength: including tensile strength, compressive strength and wear resistance.
Chemical stability: observe the degree of material degradation and surface changes.
Fatigue life: record the failure time of the gasket under repeated loads.
Thermal stability: evaluate the performance changes of the gasket under high or low temperature conditions.
Data analysis and result interpretation
Data recording: real-time recording of various parameters during the test, including temperature, pressure, leakage rate, deformation, etc.
Trend analysis: draw a curve chart of performance changes over time to identify potential failure modes.
Failure mode analysis: observe the changes in the surface and internal structure of the gasket through a microscope or scanning electron microscope to determine the cause of failure.
Comparative analysis: compare the test results with the design requirements or industry standards to evaluate whether the gasket meets the expected performance.

Through a scientific evaluation process, not only can the actual performance of the gasket be verified, but it can also provide an important basis for subsequent optimization design. The ultimate goal is to ensure that the gasket can operate stably in complex working conditions, meet engineering needs and extend its service life.