Codf-evolutions on polycrystalline orientation continua obtained by fast geometric estimates of plastic slip

2010 ◽  
Vol 85 (9) ◽  
pp. 1103-1139 ◽  
Author(s):  
C. Miehe ◽  
I. Frankenreiter ◽  
D. Rosato
Keyword(s):  
Plastic Slip ◽  
Geometric Estimates

Plastic Slip and Early Stage of Fatigue Damage in Polycrystals: Comparison between Experiments and Crystal Plasticity Finite Elements Simulations

2014 ◽  
Vol 891-892 ◽  
pp. 1711-1716 ◽  
Author(s):  
Loic Signor ◽  
Emmanuel Lacoste ◽  
Patrick Villechaise ◽  
Thomas Ghidossi ◽  
Stephan Courtin
Keyword(s):  
Fatigue Crack ◽  
Finite Elements ◽  
Crack Initiation ◽  
Fatigue Damage ◽  
Crystal Plasticity ◽  
Early Stage ◽  
Low Cycle Fatigue ◽  
Fatigue Cracks ◽  
Fatigue Crack Initiation ◽  
Plastic Slip

For conventional materials with solid solution, fatigue damage is often related to microplasticity and is largely sensitive to microstructure at different scales concerning dislocations, grains and textures. The present study focuses on slip bands activity and fatigue crack initiation with special attention on the influence of the size, the morphology and the crystal orientation of grains and their neighbours. The local configurations which favour - or prevent - crack initiation are not completely identified. In this work, the identification and the analysis of several crack initiation sites are performed using Scanning Electron Microscopy and Electron Back-Scattered Diffraction. Crystal plasticity finite elements simulation is employed to evaluate local microplasticity at the scale of the grains. One of the originality of this work is the creation of 3D meshes of polycrystalline aggregates corresponding to zones where fatigue cracks have been observed. 3D data obtained by serial-sectioning are used to reconstruct actual microstructure. The role of the plastic slip activity as a driving force for fatigue crack initiation is discussed according to the comparison between experimental observations and simulations. The approach is applied to 316L type austenitic stainless steels under low-cycle fatigue loading.

GEOMETRIC ESTIMATES OF HERITABILITY IN BIOLOGICAL SHAPE

Evolution ◽  
2002 ◽  
Vol 56 (3) ◽  
pp. 563 ◽  
Author(s):  
Leandro R. Monteiro ◽  
José Alexandre F. Diniz-Filho ◽  
Sérgio F. dos Reis ◽  
Edilson D. Araújo
Keyword(s):  
Biological Shape ◽  
Geometric Estimates

scholarly journals ANALYSIS OF DEFORMATION PROCESSES OF MAGNESIUM ALLOY AT ELEVATED TEMPERATURES BY ORIENTATION MAPPING

2011 ◽  
Vol 23 (1) ◽  
pp. 53 ◽  
Author(s):  
Ping Yang ◽  
Li Meng ◽  
Yisong Hu ◽  
Zude Zhao ◽  
Xueping Ren
Keyword(s):  
Magnesium Alloy ◽  
Elevated Temperatures ◽  
Plastic Slip ◽  
Rotation Axes ◽  
Orientation Mapping ◽  
Back Scattering ◽  
Deformation Processes ◽  
Relationship Of ◽  
The Relationship

Orientation mapping based on electron back scattering diffraction technique was applied to reveal the distributions of disorientations and rotation axes of grains caused by plastic slip and twinning during channel die compression in magnesium alloy ZA31. In addition, the orientations of dynamically recrystallized grains and deformed grains were separated and compared with respect to their initial textures. The relationship of strain and {1012} twin amount was determined quantitatively by referring to twin orientations. The reasons leading to the observed phenomena are analyzed and discussed.

scholarly journals Geometric estimates for complex Monge–Ampère equations

2020 ◽  
Vol 2020 (765) ◽  
pp. 69-99 ◽  
Author(s):  
Xin Fu ◽  
Bin Guo ◽  
Jian Song
Keyword(s):  
Einstein Metrics ◽  
Kähler Manifolds ◽  
Singular Solutions ◽  
Kahler Manifolds ◽  
Diameter Estimate ◽  
Uniform Diameter ◽  
Kähler Einstein Metrics ◽  
Geometric Regularity ◽  
Monge Ampere ◽  
Geometric Estimates

AbstractWe prove uniform gradient and diameter estimates for a family of geometric complex Monge–Ampère equations. Such estimates can be applied to study geometric regularity of singular solutions of complex Monge–Ampère equations. We also prove a uniform diameter estimate for collapsing families of twisted Kähler–Einstein metrics on Kähler manifolds of nonnegative Kodaira dimensions.

scholarly journals Regularity and geometric estimates for minima of discontinuous functionals

2015 ◽  
Vol 31 (1) ◽  
pp. 69-108 ◽  
Author(s):  
Eduardo Teixeira ◽  
Raimundo Leitão
Keyword(s):  
Geometric Estimates

Early Developments for a Semi-Analytical Model of Weld Induced Residual Stress

2007 ◽  
Author(s):  
Jess M. Bromley ◽  
Hassan Alizadeh ◽  
David J. Smith ◽  
Christopher E. Truman
Keyword(s):  
Residual Stress ◽  
Analytical Model ◽  
Thermal Processing ◽  
Complete Solution ◽  
Analytical Models ◽  
Thermal Processes ◽  
Rapid Testing ◽  
Plastic Slip ◽  
Computationally Expensive ◽  
The Given

The generation of plastic slip and residual stress by thermal processes is particularly difficult to understand and simulate. Modelling such problems is computationally expensive when approached numerically and extremely complex to approach analytically. ‘Semi-analytical’ models, in which analytical thermoelastic solutions are combined with approximate models of plasticity, offer a way to bridge this gap and have the potential to allow the rapid testing of parameter sensitivities before one launches a time-consuming full numerical model. However the construction of such models within such a thermal framework poses its own problems. An initial requirement for any such semi-analytical model is a complete solution to the elastic only response of the material to the given loading process. In this paper we focus on the formulation of such a solution for the simplest case relevant to welding or similar thermal processing. We verify the solution developed against finite element predictions and then further investigate it. In doing so we explain how the nature of this solution, especially its predicted yielding behaviour, has ramifications for the successful creation of a full semi-analytical solution.

scholarly journals The Effect of Forest Dislocations on the Evolution of a Phase-Field Model for Plastic Slip

2018 ◽  
Vol 232 (1) ◽  
pp. 65-119 ◽  
Author(s):  
Patrick W. Dondl ◽  
Matthias W. Kurzke ◽  
Stephan Wojtowytsch
Keyword(s):  
Phase Field ◽  
Field Model ◽  
Phase Field Model ◽  
Plastic Slip
Sign in / Sign up

Export Citation Format

Share Document