Residual stress characterization in cross-sectins of small parts by combinig the contour method and scanning white-light interferometry

 

LUIZ, Jonatan Oliveir; VIOTTI, Matias Roberto; ALBERTAZZI JR, Armando.

PUBLICADO EM Experimental Mechanics, Volume 62,  Springer. 2022. pp. 1333-1348.  

https://doi.org/10.1007/s11340-022-00871-5

​

​

Resumo

The contour method (CM) allows characterizing the distribution of the normal component of the residual stresses that acts in the entire cross-section of mechanical parts. The technique starts with the well-controlled cutting of the part to be measured, usually carried out by wire electric discharge machining (WEDM). The geometric shape of the cross-section is carefully measured and used to determine the displacements resulting from the elastic relaxation of the residual stresses arising from the cut. Finally, this data is used to indirectly determine the residual stresses acting on the part before cutting. This method has been successfully applied to relatively large parts, where shape deviations can be properly measured with tactile coordinate measuring machines. When parts with small cross-sections are involved, the shape deviations on the cut surfaces are too small to be properly measured by tactile methods.