ball impact with rigid or flexible ground
I used the drop test module to simulate elastic ball impact with flat flexible surface of the same ball material properties . i meshed the whole ball with hexahedronls dyna element
Blog posts
Spectral decomposition
Dear all,
Many numerical implementation of plasticity model uses spectral decomposition to represent the Cauchy stress, elastic strain, such that stress update algorithm is written in the principal directions. As a result, I wonder what makes it benefical to write the stress update algorithm in spectral form?
Thanks,
WaiChing Sun
NRC Research Fellowship Opportunity at Duke University
Researchers at Duke University are seeking applications for NRC research associates, to work with Professors David Stepp and John Dolbow. The NRC program is unique in the sense that applicants have the opportunity to perform research on a program they design. The positions are well-paid fellowships and are nominally for two years, extendable to a third.
traditional concrete model VS damage concrete model
In my opioion, the traditional concrete model is taking the smeared cracking concept to deal with the tensile cracking and using the elastoplastic method to deal with the compressive softening.
We can find that recently the CDM based concrete model become a hot research subject.
But what are the advantages of the CDM-based?
Thank you very much!
Numerical phase modeling of BTO nanostructure using Landis' model with FEAP
The difference to the common model used is the f,g terms. The 3D FEM formulation has been derived and a new fortran program is written. The derivative matrix is symmetric. But the calculation result does not converge. I have tried every means to get a converging result. But it doesn't work, the residual norm always increases.
Differences of various strain measures
For large deformation, we have various deformation measures such as Green-Lagrange tensor, Almansi strain tensor, left Cauchy-Green deformation tensor, and right Cauchy-Green deformation tensor. Appreciate very much any explanation in respect to physical differences of those measures, why they are necessary, conditions where one is more accurate than another! Thank you.
Upa-