Compressive residual stress in X-ray fractography.

Effect of Compressive Residual Stress on the Corner Crack Growth

In the present study, plasticity induced crack closure (PICC) concept and three dimensional (3D) finite element methods (FEM) are used to study the effect of compressive residual stress field on the fatigue crack growth from a hole. To investigate the effect of compressive residual stress on crack opening levels and crack shape evolution, Carlson’s experiments were simulated. Crack shape evolut...

Recent Advances in the Measurement of Residual Stress by X-Ray Diffraction

A new X-ray method for residual stress evaluation in coatings

Transition metal nitride coatings films such as TiN or ZrN have been extensively studied for industrial applications. Residual stresses of the coatings generally affect the mechanical behaviour and the corrosion resistance and hence the performance of the product. The development of new, fast and simple methods for the assessment of residual stresses is then of great importance for coating tech...

Deformation twinning and residual stress in calcite studied with synchrotron polychromatic X-ray microdiffraction

Microstructures of deformed calcite in marble from the Bergell Alps are studied by using a microfocused polychromatic synchrotron X-ray beam. The high spatial resolution, together with orientation and strain resolutions, reveals twin plane orientation, multiple twin lamellae, and strain distributions associated with the twins. Single and multiple mechanical twins on e 1⁄4 0118 systems are confi...

Depth-resolved residual stress evaluation from X-ray diffraction measurement data using the approximate inverse method

The paper deals with the depth determination of residual stress states from diffraction data. First an historical overview of the known approaches is given. Then we apply the approximate inverse method to this problem. This method is known to be very efficient and stable with respect to noise-contaminated data. It is even possible to prove convergence and it allows an error estimate of the calc...