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Electrohydraulic fatigue apparatus for testing at cryogenic temperature.

P K Liaw¹, J Baker

¹Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60201Department of Chemistry, Northwestern University, Evanston, Illinois 60201.

The Review of Scientific Instruments

|December 1, 1979

Summary

A new electrohydraulic fatigue apparatus was developed for material testing from room temperature down to 77 K. This system allows precise cyclic fatigue testing under strain control at low temperatures without interrupting hydraulic power.

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Area of Science:

Materials Science
Mechanical Engineering
Cryogenics

Background:

Fatigue testing is crucial for understanding material durability.
Existing electrohydraulic systems have limitations at cryogenic temperatures.
Precise control of temperature and stress is essential for accurate fatigue analysis.

Purpose of the Study:

To design and construct an advanced closed-loop electrohydraulic fatigue apparatus.
To enhance the electronic control systems for improved functionality.
To enable fatigue testing across a wide temperature range, including cryogenic conditions.

Main Methods:

Construction of a closed-loop electrohydraulic fatigue testing system.
Integration of improved electronics for reference function generation and servo control.
Implementation of a controlled cool-down procedure to 77 K at zero stress.
Application of strain control for cyclic fatigue testing.

Main Results:

The apparatus successfully operates from above room temperature down to 77 K.
Improved electronics allow for precise temperature correction and strain control.
Testing can be performed continuously without interruption of hydraulic power.
The system facilitates cryogenic fatigue testing with enhanced accuracy.

Conclusions:

The developed electrohydraulic fatigue apparatus offers significant improvements for low-temperature material testing.
The enhanced electronic controls provide greater precision and flexibility.
This apparatus is a valuable tool for cryogenic fatigue research and material characterization.