Hello everybody,
I am working on FE Simulation of interface cracks. To this end, I use modified VCCT, CSDEM and other such methods to determine mesh independent strain energy release rate (G) and Mode mixity (ψ). Now I have a fundamental doubt.
Abstract
A special issue of Journal of Nanomaterials is devoted to "Low-Dimensional Phase Transforming Materials" which obtained significant interests in the recent years. This topic covers a broad range of research such as
Hello experts, I am trying to model the response (damage+plasticity) and compare with commercial FE codes. I chose to follow explicit scheme and compare with available implicit solution. Attached image shows the comparison between implicit (commerical FE software) and explicit (my Python program).
As it can be observed, near the failure, i.e. applied strain > 0.05, there is a noise in the explicit solution. When I decrease the time step, the noise infact decreases.
(a) Is this noise is a result of explicit procedure ? or some thing wrong with my algorithm ?
In our new paper published on Science Advances, we carefully measured the elastic mechanical properties of individual silicon nanowires by uniaxial tensile straining under both SEM and high-res optical microscope, and demonstrated that high quality VLS–grown single-crystalline Si nanowires with diameters of ~100 nm can be reversibly stretched at room temperature with 10% or more elastic strain, approaching the theoretical limit of silicon.
Hi Everyone,
Has anyone been able to successfully code a UEL for modelling multiphase flow in rocks in abaqus, I have seen some work by Björn Schümann and checked out some of his references (Holler, 2006) but i have been unable to get this to work. Any ideas or can anyone point me in the right direction ?
Thanks
Molecular dynamics (MD) is employed to investigate the plastic deformation mechanisms of single crystalline yttria-stabilized tetragonal zirconia (YSTZ) nanopillars under uniaxial compression. Simulation results show that the nanoscale plastic deformation of YSTZ is strongly dependent on the crystallographic orientation of zirconia nanopillars. For the first time, the experimental explored tetragonal to monoclinic phase transformation is reproduced by MD simulations in some particular loading directions.
Small-scale mechanics, especially in situ in electron microscopes, is what I enjoy spending my time with. Within this monthly journal club topic on iMechanica, I would like to give a quick recapitulation of what happened in micromechanics, of course with special emphasis to in situ techniques, over the last years to set the stage. Subsequently, we should revisit some longstanding issues before turning towards recent developments in the field of fracture testing.
The University of Notre Dame, Center for Shock Wave-processing of Advanced Reactive Materials (C-SWARM), is seeking a highly qualified candidate for the postdoctoral associate position in the area of computational mechanics/physics with emphasis on chemically reactive solids. C-SWARM is center of excellence established by National Nuclear Security Administration (NNSA) whose primary focus is on the emerging field of predictive science.
Prescribing Surface Strains to change Gauss curvature
To change Gauss curvature K of a surface we need to strain each differential shell element by virtue of Egregium theorem ( K is invariant if strain is zero in isometry mappings).
Can someone help with a geometrical problem where imposed strains are to be defined (at differential shell element level of a right circular cylinder) to obtain a surface of revolution with Gauss curvature +1 or -1 (sphere or pseudosphere) ? Or their isometric equivalents? Cylindrical coordinates may be used.
