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The SET-X Elphyse instrument allows you to measure the strain in the crystal lattice by x-ray diffraction, from which the residual stress is then calculated.
This equipment allows you to obtain the total stress tensors on the surface of a metal in a few minutes.
Its small size and its depression fixing system allow measurements on surfaces of various forms and in various positions.
The X-Ray high resolution position sensitive detector and a Pentium PC-Board with an efficient software, make this equipment entirely automatic for the analyse of the stresses as well as for the dosage of retained austenite.
The Stress measurement instrument SET-X Elphyse is the result of the close collaboration and great experience of ENSAM Paris and Physique & industrie.
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The SET-X System
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The Set-X apparatus is portable and can be used on site.
It is composed of 4 parts :
1. Calculator and position sensitive detector
2. X-Ray generator 25kV 10mA regulated
3. Autonomous cooling system for X-Ray tube
4. Goniometer
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Computer control of the Set-X
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The new hardware version of the SET-X, is made with the last technologic progress (a fast microprocessor, a several Giga octet hard disk, a 6.4 Inch, active matrix color TFT display...) which make your equipment more efficient and competitive .
The Set-X is delivered with WinStress, a high performance, user friendly software (running under Microsoft Windows) that control the goniometer, the X-Ray tube and the position detector, and perform a residual stress calculation.
WinStress has been developed by Dr. J.M. SPRAUEL expert in residual stress measurement.
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For more information about the software click here !
The software controls :
 The Goniometer F and Y movements, enabling oscillations in Y.
The X-tube generator to set it in stand-by between each measurement.
The Position Detector, that measures the diffracted X-Rays vs. the position.
The software performs :
Data acquisition.
Calculation of stresses, linearly, elliptically or tri-axially, according to your choice.
Calculation of retrained austenite.
Calculation of the shearing value.
Communication with an external PC.
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The SET-X instrument : X-Ray position sensitive detector
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- Goniometer F for the measurement of the stress tensor.
- X-Ray P.S.D. that permits a quick acquisition of diffraction peaks. Many type of Anti-cathodes are available (chromium, manganese, cobalt, copper and iron).
- Electronic Displacement Pick-up, allowing precise centering of goniometer on material to be measured.
- X-Ray collimator
- Y goniometer for stress measurements.
- Sample to examine
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Basic principle
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Measurements of stresses in metals are made by using the distance between the atoms plans (Inter-reticular distance), as a stress gauge. This distance is measured with the help of the diffraction of an X-Ray beam on the analyzed part.
The BRAGG principle is used to measure the distance between the atoms plans.
A Y goniometer takes several measures of the q diffraction angle as function of the angle Y ; then one traces on a diagram a straight line passing through the measures points q = sin²Y.
The slope of the straight line linked to the elastic constants of the material, determines the stress.
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