Journal Club Theme of May 2016: Recent Progress in Curvilinear Electronics and Mechanics
Recent Progress in Curvilinear Electronics and Mechanics
Jianliang Xiao
Department of Mechanical Engineering, University of Colorado Boulder
1. Introduction
research
Quantifying dislocation microstructure evolution and cyclic hardening in fatigued face-centered cubic single crystals
Discrete dislocation dynamics simulations were performed to investigate the dislocation microstructure evolution and cyclic hardening during the early stages of fatigue loading in nickel single crystals. The effects of the crystal size and initial dislocation densities on both the mechanical response and the evolution of dislocation microstructure were quantified. Crystals having an initial dislocation density of 1012 m−2 and diameter less than do not show any dislocation density multiplication or cyclic hardening.
Line Spring elements errors
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***Problem ***
Failure pressure for Steam generator tube having 2 axial cracks. I am following one paper in that paper they found failure pressure by finding J and K values for line spring elements for different pressure. The pressure at which it approach material JIC(92N/mm) and KIC(65Mpa*sqrt(m)) value is considered as failure pressure or coalescence pressus
**Modelling**
Universal Scaling Laws for Homogeneous Dislocation Nucleation During Nanoindentation
Akanksha Garg, Craig Maloney
(accepted mannuscript in Journal of Mechanics and Physics of Solids)
On axisymmetric/diamond-like mode transitions in axially compressed core-shell cylinders
Recent interests in curvature- and stress-induced pattern formation and pattern selection motivate the present study. Surface morphological wrinkling of a cylindrical shell supported by a soft core subjected to axial compression is investigated based on a nonlinear 3D finite element model. The post-buckling behavior of core-shell cylinders beyond the first bifurcation often leads to complicated responses with surface mode transitions. The proposed finite element framework allows predicting and tracing these bifurcation portraits from a quantitative standpoint.
Generate master curve for viscoelasticity
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I would like to generate a master curve (e.g. of the storage modulus) based on frequency-sweeps experiment for different temperatures.
Basically, I need to determine the shifts in order to construct the master curve. I want to automatize the process with Matlab, instead of shifting the data by hand. And I don't want to use WLF or Arrhenius methods.
I want to determine the shifts for each temperature s.t. I get a smooth master curve (minimize the error using least square).
How do I rectify an error regarding memory storage when I generate substructures in ABAQUS?
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I have been trying to generate a substructure in ABAQUS for a big diameter roller bearing. I have used two reference points, one each for inner and outer raceways to couple the inner and outer raceway surfaces. I have two steps in the analysis. The first step is Frequency followed by Substructure generation step. The analysis runs fine till the end of first step and calculates the eigen frequencies. When the second step starts, following error message appears.
" Element 439473 requires more than 2GB of memory for storage"
How to analysis Fatigue of shaft using Ansys or Ncode designlife?
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I use ANSYS APDL with code for my shaft with two coating layers(interlayer and coating layer). I already analysis stress of shaft with Ansys. the result is ok and i exported to .RST file. But , when i input my shaft to Ncode, I can't find the interlayer and coating layers.I think this shaft have 3 part(subtrate, interlayer, coating layer)
!substrate materials
Young's modulus (Mpa): 2.1e5
Poisson's ratios:0.3
Density(ton/mm3):8.03e-9
! interlayer material
Young's modulus (Mpa): 3,2e5
Poisson's ratios:0.31
Density(ton/mm3):8.908e-9