Dislocation Mechanics Pile-Up and Thermal Activation Roles in Metal Plasticity and Fracturing

dc.contributor.authorArmstrong, Ronald W.
dc.date.accessioned2023-11-16T19:54:12Z
dc.date.available2023-11-16T19:54:12Z
dc.date.issued2019-01-31
dc.description.abstractDislocation pile-up and thermal activation influences on the deformation and fracturing behaviors of polycrystalline metals are briefly reviewed, as examples of dislocation mechanics applications to understanding mechanical properties. To start, a reciprocal square root of grain size dependence was demonstrated for historical hardness measurements reported for cartridge brass, in line with a similar Hall-Petch grain size characterization of stress-strain measurements made on conventional grain size and nano-polycrystalline copper, nickel, and aluminum materials. Additional influences of loading rate (and temperature) were shown to be included in a dislocation model thermal activation basis, for calculated deformation shapes of impacted solid cylinders of copper and Armco iron materials. Connection was established for such grain size, temperature, and strain rate influences on the brittle fracturing transition exhibited by steel and other related metals. Lastly, for AISI 1040 steel material, a fracture mechanics based failure stress dependence on the inverse square root of crack size was shown to approach the yield stress at a very small crack size, also in line with a Hall-Petch dependence of the stress intensity on polycrystal grain size.
dc.description.urihttps://doi.org/10.3390/met9020154
dc.identifierhttps://doi.org/10.13016/dspace/xsuy-lvvo
dc.identifier.citationArmstrong, R.W. Dislocation Mechanics Pile-Up and Thermal Activation Roles in Metal Plasticity and Fracturing. Metals 2019, 9, 154.
dc.identifier.urihttp://hdl.handle.net/1903/31431
dc.language.isoen_US
dc.publisherMDPI
dc.relation.isAvailableAtA. James Clark School of Engineeringen_us
dc.relation.isAvailableAtMechanical Engineeringen_us
dc.relation.isAvailableAtDigital Repository at the University of Marylanden_us
dc.relation.isAvailableAtUniversity of Maryland (College Park, MD)en_us
dc.subjectdislocation mechanics
dc.subjectyield strength
dc.subjectgrain size
dc.subjectthermal activation
dc.subjectstrain rate
dc.subjectimpact tests
dc.subjectbrittleness transition
dc.subjectfracturing
dc.subjectcrack size
dc.subjectfracture mechanics
dc.titleDislocation Mechanics Pile-Up and Thermal Activation Roles in Metal Plasticity and Fracturing
dc.typeArticle
local.equitableAccessSubmissionNo

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