Changes in Elastic-strain Profiles around a Crack Tip during Tensile Loading and Unloading Cycles
نویسندگان
چکیده
The changes in elastic lattice-strain profiles and plastic zone around the fatigue crack in a compact-tension specimen were investigated during monotonic tensile loading and unloading cycles using neutron diffraction. Spatially-resolved strain measurements were performed on a 316 LN stainless steel to determine the in-plane (parallel to the loading direction) lattice-strain profiles ahead of the crack tip under a constant tensile load. The strain scanning was repeated under various applied loads ranging from 667 N to 8,889 N, which showed the development of in-situ tensile elastic lattice strains and associated plastic zone near the crack tip. Moreover, an increase in the compressive residual strains in front of the crack tip was observed after overloading the specimen. Finally, the comparison between the theoretically-estimated plastic zone size and the changes in the diffraction peak width showed a good agreement.
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