Full-Field Measurement of Residual Stresses in Composite Materials Using the Incremental Slitting and Digital Image Correlation Techniques
Article dans une revue avec comité de lecture
Background The slitting method is a widely used destructive technique for the determination of residual stresses. Because of the rich data content of the full-field methods, optical techniques such as digital image correlation (DIC) are replacing strain gages for surface measurements. Objective The objective of the current paper is to overcome the difficulties that arise in using the DIC technique combined with the slittingmethod. The present noise, low signal-to-noise ratio, and systematic errors are themain impediments to the use of DIC in the slitting method. Methods An approach based on the eigenstrain concept was exploited to ascertain the optimum region of interest (ROI) for the analysis. After that, a robust procedure was implemented to utilize the DIC method while excluding the rigid body motion and rotation artifacts from the obtained displacements. Results Different slitting steps may cause dissimilar rigid bodymotions and rotations of the specimen. The proposedmethod was able to eliminate all of these different shears and stretches in the images simultaneously. The slitting experiment was conducted on a symmetric cross-ply composite specimen, and the slit progressed down to half the thickness. Although some rigid body motions were large, the method managed to exclude all of them for eight slitting steps. Conclusion A comparison made between the results of the current method and those of the strain gage technique shows that they are in acceptable agreement with each other, and this full-field method can be extended to smaller scales or other destructive techniques.
Files in this item
Showing items related by title, author, creator and subject.
Analysis of Residual Stress Relaxation Under Mechanical Cyclic Loading of Shot-Peened TRIP780 Steel Communication avec acteMAUDUIT, C.; KUBLER, Régis; BARRALLIER, Laurent; BERVEILLER, Sophie; PUYDT, Quentin; MONIN, Martine; WEBER, Bastien (Materials Research Forum LLC, 2016)Shot-peening is a popular mechanical surface treatment used in automotive and aeronautical industries to enhance life duration of mechanical parts by introducing compressive residual stresses. TRIP 780 fatigue type specimens ...
Article dans une revue avec comité de lectureJEGOU, Sébastien; BARRALLIER, Laurent; KUBLER, Régis; SOMERS, Marcel (Hanser, 2011)Development and evolution of compressive residual stress during nitriding treatment are studied. A model carbon iron-based alloy Fe-3wt.%Cr-0.35wt.%C was nitrided in gas at 550 °C for different times. Microstructural ...
Micromechanical behavior of UO2: crystalline anisotropy and associated internal stressezs in polycrystals Communication avec acteSOULACROIX, Julian; MICHEL, Bruno; GATT, Jean-Marie; KUBLER, Régis; BARRALLIER, Laurent (2013)Uranium dioxide is the standard nuclear fuel for pressurized water reactors in France. This ceramic is manufactured by sintering. The standard shape for use in nuclear reactor is a small cylinder, also called “pellet”, ...
Article dans une revue avec comité de lectureJEGOU, Sébastien; BARRALLIER, Laurent; KUBLER, Régis (Elsevier, 2010)Phase transformations during nitriding of a ternary carbon iron-based alloy Fe–3%Cr–0.345%C were studied, aiming for a better understanding of residual stresses generation and evolution. The relationship between the ...
Article dans une revue avec comité de lectureJEGOU, Sébastien; BARRALLIER, Laurent; KUBLER, Régis (Trans Tech Publications Inc, 2011)Nitriding is a well-established thermochemical surface treatment of carbon micro-alloyed steels aiming enhancing surface properties such as fatigue, wear and corrosion resistances. The idea is taking benefits from the high ...