Daniel N. Blaschke
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View article: PyDislocDyn: A Python code for calculating dislocation drag and other crystal properties
PyDislocDyn: A Python code for calculating dislocation drag and other crystal properties Open
PyDislocDyn is a suite of python programs designed to perform various calculations for basic research in dislocation dynamics in metals with various crystal symmetries in the continuum limit. In particular, one of its main purposes is to c…
View article: Phase Transformation Kinetics Model for Metals
Phase Transformation Kinetics Model for Metals Open
We develop a new model for phase transformation kinetics in metals by generalizing the Levitas-Preston (LP) phase field model of martensite phase transformations (see Levitas and Preston (2002a,b); Levitas, Preston and Lee (2003)) to arbit…
View article: Exploring the relation between transonic dislocation glide and stacking fault width in FCC metals
Exploring the relation between transonic dislocation glide and stacking fault width in FCC metals Open
Theory predicts limiting gliding velocities that dislocations cannot overcome. Computational and recent experiments have shown that these limiting velocities are soft barriers and dislocations can reach transonic speeds in high rate plasti…
View article: Predicting Electrical Conductivity in Bi-Metal Composites
Predicting Electrical Conductivity in Bi-Metal Composites Open
Generating high magnetic fields requires materials with not only high electric conductivity but also good strength properties in order to withstand the necessarily strong Lorentz forces. A number of bi-metal composites, most notably Cu/Nb,…
View article: Exploring the relation between transonic dislocation glide and stacking fault width in FCC metals
Exploring the relation between transonic dislocation glide and stacking fault width in FCC metals Open
Theory predicts limiting gliding velocities that dislocations cannot overcome. Computational and recent experiments have shown that these limiting velocities are soft barriers and dislocations can reach transonic speeds in high rate plasti…
View article: Predicting electrical conductivity in bi-metal composites
Predicting electrical conductivity in bi-metal composites Open
Generating high magnetic fields requires materials with not only high electric conductivity, but also good strength properties in order to withstand the necessarily strong Lorentz forces. A number of bi-metal composites, most notably Cu/Nb…
View article: Effect of helium bubbles on the mobility of edge dislocations in copper
Effect of helium bubbles on the mobility of edge dislocations in copper Open
Helium bubbles can form in materials upon exposure to irradiation. It is well known that the presence of helium bubbles can cause changes in the mechanical behavior of materials. To improve the lifetime of nuclear components, it is importa…
View article: Comparing theoretical predictions of radiation-free velocities of edge dislocations to molecular dynamics simulations
Comparing theoretical predictions of radiation-free velocities of edge dislocations to molecular dynamics simulations Open
Transonic defect motion is of interest for high strain-rate plastic deformation as well as for crack propagation. Ever since Eshelby's 1949 prediction [J. D. Eshelby, Proc. Phys. Soc. A 62, 307 (1949)] in the isotropic limit of a “radiatio…
View article: Properties of Accelerating Edge Dislocations in Arbitrary Slip Systems with Reflection Symmetry
Properties of Accelerating Edge Dislocations in Arbitrary Slip Systems with Reflection Symmetry Open
We discuss the theoretical solution to the differential equations governing accelerating edge dislocations in anisotropic crystals. This is an important prerequisite to understanding high-speed dislocation motion, including an open questio…
View article: Comparing theoretical predictions of radiation-free velocities of edge dislocations to molecular dynamics simulations
Comparing theoretical predictions of radiation-free velocities of edge dislocations to molecular dynamics simulations Open
Transonic defect motion is of interest for high strain-rate plastic deformation as well as for crack propagation. Ever since Eshelby's 1949 prediction in the isotropic limit of a 'radiation-free' transonic velocity $v_\text{RF}=\sqrt{2}c_{…
View article: IC t22_nonlinearnyg Highlight: Linear vs. quadratic yield strength-shear modulus scaling in the case of dynamic compression: shock loading of Al and W [Slide]
IC t22_nonlinearnyg Highlight: Linear vs. quadratic yield strength-shear modulus scaling in the case of dynamic compression: shock loading of Al and W [Slide] Open
is basically acceptable for these materials, and the SCG model can be used to describe the shear modulus and yield strength of the shocked material at high pressure and temperature.
View article: Properties of accelerating edge dislocations in arbitrary slip systems with reflection symmetry
Properties of accelerating edge dislocations in arbitrary slip systems with reflection symmetry Open
We discuss the theoretical solution to the differential equations governing accelerating edge dislocations in anisotropic crystals. This is an important prerequisite to understanding high speed dislocation motion, including an open questio…
View article: Machine Learning Based Approach to Predict Ductile Damage Model Parameters for Polycrystalline Metals
Machine Learning Based Approach to Predict Ductile Damage Model Parameters for Polycrystalline Metals Open
Damage models for ductile materials typically need to be parameterized, often with the appropriate parameters changing for a given material depending on the loading conditions. This can make parameterizing these models computationally expe…
View article: LEAD - LEArning Damage
LEAD - LEArning Damage Open
LEAD is a suite of scripts to enable rapid estimation of model parameters for damage models for ductile materials using machine learning. In its current version, the only supported damage model is TEPLA, though others are planned. The data…
View article: Heavily doped zinc oxide with plasma frequencies in the telecommunication wavelength range
Heavily doped zinc oxide with plasma frequencies in the telecommunication wavelength range Open
We demonstrate heavy and hyper doping of ZnO by a combination of gallium (Ga) ion implantation using a focused ion beam (FIB) system and post-implantation laser annealing. Ion implantation allows for the incorporation of impurities with ne…
View article: PyDislocDyn: Code Manual
PyDislocDyn: Code Manual Open
PyDislocDyn [1] is a suite of python programs designed to perform various calculations for basic research in dislocation dynamics in metals with various crystal symmetries in the continuum limit.
View article: Predicting electrical conductivity in Cu/Nb composites: A combined model-experiment study
Predicting electrical conductivity in Cu/Nb composites: A combined model-experiment study Open
The generation of high magnetic fields requires materials with high electric conductivity and good strength properties. Cu/Nb composites are considered to be good candidates for this purpose. In this work, we aim to predict, from theory, t…
View article: Limiting velocities and transonic dislocations in Mg
Limiting velocities and transonic dislocations in Mg Open
To accurately predict the mechanical response of materials, especially at high strain rates, it is important to account for dislocation velocities in these regimes. Under these extreme conditions, it has been hypothesized that dislocations…
View article: Predicting electrical conductivity in Cu/Nb composites: a combined model-experiment study
Predicting electrical conductivity in Cu/Nb composites: a combined model-experiment study Open
The generation of high magnetic fields requires materials with high electric conductivity and good strength properties. Cu/Nb composites are considered to be good candidates for this purpose. In this work we aim to predict, from theory, th…
View article: Phase Field Dislocation Dynamics (PFDD) version 2.x
Phase Field Dislocation Dynamics (PFDD) version 2.x Open
This disclosure is for version 2.x of a mesoscale model called Phase Field Dislocation Dynamics (PFDD). PFDD is used for investigating deformation in nanoscale (grain sizes of ~300 nm and less) materials, such as metals and alloys. This ap…
View article: How to determine limiting velocities of dislocations in anisotropic crystals
How to determine limiting velocities of dislocations in anisotropic crystals Open
In the continuum limit, the theory of dislocations in crystals predicts a divergence in the elastic energy of the host material at a crystal geometry dependent limiting (or critical) velocity v c . Explicit expressions for v c are scattere…
View article: IC W20_thermoelasticity Highlight: Dynamic strength - shear modulus scaling for tantalum at extreme pressures [Poster]
IC W20_thermoelasticity Highlight: Dynamic strength - shear modulus scaling for tantalum at extreme pressures [Poster] Open
Two figures are shown: Pressure dependence of the shear modulus of Ta for two fundamental curves: the 300 K isotherm and the Hugoniot; and, Scaling of the high pressure strength (Y) of Ta with shear modulus (G). The dashed curve represents…