X-Ray Elastic Constant Determination System 
X-ray Elastic constant determination system allows experimental determination of the Effective X-ray elastic constant EEff. This constant is needed for calculating the macroscopic stresses from lattice strains. This method can be used, when residual stresses are to be evaluated by X-ray diffraction technique, and the Effective X-ray elastic constant of the material is unknown. Stresstech's X-ray Elastic constant determination system - Increases your residual stress measurement accuracy
- Is easy to use
- Automates the measurement routine after positioning the sample
The system - Works with load cell or strain gage
- Is integrated in the X3000 software
- Is in accordance with the ASTM standard E 1426-91
Measurement principleIn the X-ray Elastic constant determination process the test specimen is bent applying load that changes in steps. XSTRESS 3000 system makes a normal stress measurement during each step. From each measurement X3000 software calculates the change in interplanar spacing (∆d) between =0 and = orientations of specific planes. This difference is used for the X-ray elastic constant determination. According to the ASM E1426-91 standard the Elastic constant is determined by first calibrating the strain gage by known load, and then bending the bar sample and measuring and recording the strain. With Stresstech's Elastic constant determination system the load is measured with the calibrated load cell and interplanar spacing change measured with the XSTRESS 3000. HardwareThe complete X-ray Elastic constant determination system consists of the following components: 
- XSTRESS 3000 X-ray diffractometer
- Elastic constant device (four-point bending device)
- Strain amplifier BC500
- Connecting cables
- X3000 software package with X-ray elastic constant option
- Computer
SoftwareStrain Amplifier Control display serves as a digital strain indicator, showing the actual applied load (N) read from load cell or strain read from strain gage. According to the ASM E1426-91 standard the Elastic constant is determined by first calibrating the strain gage by known load, and then bending the bar sample and measuring and recording the strain. With the Elastic constant determination software the measurements can be made by - Using only strain gage, when the results are calculated using given Young's modulus.
- Using strain gage calibration, when strain gage is calibrated by the load cell, and measurement is made by controlling the load stress by the calibrated strain gage, and ∆d is measured by the XSTRESS 3000.
- Using only load cell
After the actual measurements have been made, the Effective X-ray elasticity constant is calculated separately from each series and as average value from all of the series. Test specimen can also be bent manually with the system. Downloadable files: |
stresstech.fi