This presentation gives overview of methods to perform residual stress analysis in any mechanical component.

1. Residual Stress Analysis by Diffraction using High-Energy Synchrotron Radiation By , Aniket Suresh Waghchaure. Michigan Tech University,Houghton.

3. Residual Stresses are that remain after the original cause of the stresses (external forces heat gradient) has been removed.

4. Residual stresses occur for a variety of reasons, including inelastic deformations and heat treatment.

5. Heat from welding may cause localized expansion, which is taken up during welding by either the molten metal or the placement of parts being welded.

7. Different types of residual stresses. Figure 1 [1]

9. Residual stress measurement techniques Non Destructive Methods Residual stresses Destructive Methods Neutron or Synchroton diffraction X ray Diffraction Ultrasonics Magnetic waves Hole Drilling Method Curvature Method

10. Basic Principle Of High Energy Synchrotron Diffraction Fig 2.0 Experimental setup at the high Energy beam line ID 15A at the ESRV,Grenoble,France. [2]

11. Gauge volume and Scanning of the sample Figure 3 [2] Figure 4 [2]

12. Gauge volume is given by the intersection of the incoming and the diffracted beam Formulae's: d hkl = Where, dhkl - lattice spacing with hkl denoting Miller’s indexes, θ -Bragg angle , h -Planck’s constant, c -velocity of light. = and are the diffraction elastic constants (DEC).

13. Gage Volume Dependence Figure 5 [2] Figure 6 [2]

15. The aim of the HESD analysis was to determine the residual stresses parallel and perpendicular to the fibers within a layer in the bulk of the sample

16. The penetration depth and the resolution required for experiment cannot be achieved using X-ray or neutron diffraction but can be by employing HESD Figure 7 Residual stresses parallel and perpendicular to the C fibers in the Sic matrix of a C/Sic-composite. [2]

20. The evaluation of the reinforcing particles effect (15 vol.% of Al2O3) on the RS evolution.

25. Thank You