The Influence Of Reference Dislocation Density ρrefα And Yield Drop The phenomenon of yield drop, characterized by a decrease in flow stress after initial yield, has been observed in various nickel based superalloys. An analytical relationship between material strength, dislocation density, strain rate and dislocation mobility is proposed, which agrees well with current simulations and published.
Influence Of Dislocation Density On Yield Strength Download Dislocation density based constitutive formulations account, in an average sense, for the evolution of the microstructure and is governed by the mechanisms of dislocation generation, immobilization, recovery and annihilation. The proposed reference dislocation density governs the extent of the yield drop phenomenon, while the yield drop strength determines its magnitude. both parameters collectively describe the entire process of the yield drop phenomenon. Stress and dislocation motion crystals slip due to a resolved shear stress, τr. applied tension can produce such a stress. The viscoplastic like equation for micro forces and a new evolution equation for the plastic distortion were derived, with respect to the reference configuration within the large deformation formalism.
Influence Of Dislocation Density On Yield Strength Download Stress and dislocation motion crystals slip due to a resolved shear stress, τr. applied tension can produce such a stress. The viscoplastic like equation for micro forces and a new evolution equation for the plastic distortion were derived, with respect to the reference configuration within the large deformation formalism. Plastic deformation introduces massive changes into the crystal lattice, including increased dislocation density (single and polycrystalline materials) and changed grain size distributions (polycrystalline materials). Increasing the initial dislocation density addresses the lack of mobile dislocations in the attenuation stage immediately following impact, resulting in lower yield points. Even though dislocation density is identical, the yield stress of these specimens are absolutely different, and the yielding of 213 k pre deformed specimens takes place at quite a lower stress in comparison with that of 298 k pre deformed specimens. In this work, we perform a total of 194 simulations using 3d ddd and md (molecular dynamics) methods to analyze the strain rate dependence of collective dislocation plasticity.
Influence Of Grain Size Initial Dislocation Density And Variant Of Plastic deformation introduces massive changes into the crystal lattice, including increased dislocation density (single and polycrystalline materials) and changed grain size distributions (polycrystalline materials). Increasing the initial dislocation density addresses the lack of mobile dislocations in the attenuation stage immediately following impact, resulting in lower yield points. Even though dislocation density is identical, the yield stress of these specimens are absolutely different, and the yielding of 213 k pre deformed specimens takes place at quite a lower stress in comparison with that of 298 k pre deformed specimens. In this work, we perform a total of 194 simulations using 3d ddd and md (molecular dynamics) methods to analyze the strain rate dependence of collective dislocation plasticity.
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