Technical description
Main functions
The creep test bench makes it possible to carry out tensile and compression creep tests on one or more standard specimens in a controlled temperature enclosure (up to +250 °C).
The force is applied by an electric actuator servo-controlled in force by a strain gauge sensor.
The elongation measurement can be obtained by the digital position of the actuator or by an extensometer system with high resolution digital cameras.
This bench also allows to carry out conventional tests of traction at a fast speed.
Operating mode
The specimens are attached in "series" thanks to specific clamps. The assembly in series ensures a total equality of the surfaces applied to each specimen.
After a first loading, the bench applies a servo-controlled creep force.
To conduct elongation measurements by the optical extensometer, the operator selects on each specimen two optical markers which will be used as reference of the length measurement. The cameras then move automatically to follow the position of each marker.
Advantages
- Drift-free high-resolution force sensor
- The deformation measurement is performed by an optical extensometer
- Automatic control of the ambient temperature by forced air
- Simple fixation of specimens and optical calibration rules
