Comparison of three residual-stress measurement methods on a mild steel bar

Mechanical properties and residual stress in porous anodic alumina structures

“…Due to the influence of the residual stress in manufacturing of the thin film, its measurement is an important issue. Several measurement methods have been used, including X-ray diffraction and the curvature and the hole drilling methods [13,14]. Although the curvature method is popular for measuring the residual stress of thin film, the residual stress in a local region cannot be determined since only an average value over a wide region is measured.…”

Residual Stress State Characterization of Machined Components by X-ray Diffraction and Multiparameter Micromagnetic Methods

“…Finally, C. O. Ruud et al tested and compared the Barkhausen Noise method with X-ray diffraction and hole drilling for residual stress measurements on mild steel bar. A qualitative good agreement of Barkhausen Noise analysis with XRD was obtained but due to calibration difficulties and microstructure variations, exact residual stress results could not be obtained [18]. Also previous own work showed that a comparison between results of X-ray diffraction data and measurements of magnetic and micromagnetic properties of materials depends on the calibration procedure [22].…”

“…Consequently difficulties arise from the fact that not only residual stresses influence the measurements but also microstructure properties like phase and grain boundaries, inclusions, dislocations, and other defects change measured micromagnetic parameters [11,16,18,20]. However, almost all of the techniques referred in the literature are based on the analysis of the Barkhausen noise.…”

“…Non-destructive micromagnetic methods for the measurement of residual stress have been developed these last three decades [11][12][13][14][15][16][17][18][19][20]. The principle is based on the interaction of residual stress fields with the movement of domain walls, also called Bloch walls, and with domain rotations during the magnetization processes [11,21].…”

Structural Characteristics at Surface and Barkhausen Noise in Aisi 4340 Steel After Grinding

“…of the noise signals connected with the magnetic domain wall movement and with the nucleation of the domains themselves, In materials with positive magnetostriction (like steels) Barkhausen noise increases or decreases by increasing tensile or compressive residual stresses respectively [1,2], Calibration curves of BN versus stress are given in the bibliography [1]; these curves are valid only for specific structures, Effects of microstructure and intergranular impurity segregation, due to tempering, on BN have been examined by Kameda et at. [3,4,5]; the dependence of BN on surface decarburation has been considered by Mayos et al [6], who have resolved the contributions to BN of pearlite and of ferrite; effects of subboundary formation and of dislocation density have been analysed by Klesnil et al [7] and by Kronrnuller [8], From a comparative study of the effects on BN of tensile stresses, precipitates and dislocations, Buttle et al [9] have drawn the conclusion that for practical 256 P. GONDI ET AL monitoring by BN of stressed regions allowance has to be made for accompanying variations of the local microstructure.…”