research

The fixed point method consists to find the solution of F(X)=X.

One can not get fixed with the convergence condition |F'(X)|<1 because if the function has an optimum then |F'(X)|=0 even if the solution is not yet reached.

We introduce an efficient convergence test with the condition:

|Xn+1 - Xn| ≤ epsilon1 And |F(Xn+1)-Xn+1| ≤ epsilon2

As a newcomer in this field, I try to pose some questions to the experts in Variable Amplitude Loading fatigue. The questions are probably trivial, but I don't find any reply in the literature, particularly on the arbitrary choice of frequency cutoff in the spectrum loading, and on the distinction  between cracked and uncracked structures. See attach and please respond if you can, even directly on email at mciava@poliba.it

In 2019, Elsevier CAGD will be publishing a special issue on ``Generalized Barycentric Coordinates,'' edited by Michael S. Floater (University of Oslo), Kai Hormann (University of Lugano), and myself.

If you expect to have any new contribution in this area, then please do consider submitting a paper to this special issue.

All the details about the special issue can be found in the attached ``Call for Papers.''

Hi every one, im tring to implement memory surface hardening model to abaqus via umat subrotin. is there one that did the same or can give me some information. thanks alot. with best regard. paknejad

While teaching some students from old textbooks, I found reference to "understressing and overstressing" as producing effects into fatigue limits.    Looking at classical papers like  W SCHUTZ, A HISTORY OF FATIGUE Engineering Fracture Mechanics Vol. 54, No. 2, pp. 263-300, 1996, he says that the theory of understressing was largely a mistake due to statistically poor testing.  However, I see some chinese papers still talk of understressing, see below.

Many engineering structures are composed of weakly coupled sectors assembled in a cyclic and ideally symmetric configuration, which can be simplified as forced Duffing oscillators. In this paper, we study the emergence of localized states in the weakly nonlinear regime. We show that multiple spatially localized solutions may exist, and the resulting bifurcation diagram strongly resembles the snaking pattern observed in a variety of fields in physics, such as optics and fluid dynamics.

The Materials Theory Group at the School of Materials Engineering of Purdue University has a post-doctoral opening in the area of physics of thermal transport in crystalline solids. The postdoc will use Boltzmann Transport Equation (BTE) approach to investigate the phonon and electron thermal transport in crystalline solids with lattice defects. A solid state physics background is highly desired for this position but applicants with a strong, closely related theory background from materials science or other engineering disciplines will be considered. The ideal candidate is one who is strongly interested in the fundamental theoretical concepts related to thermal transport and related computational modeling, and must have excellent programming skills in Fortran and/or C++. For inquiry please send an email to Professor Anter El-Azab (aelazab@purdue.edu). The position will remain open until filled. Interested candidates can send a curriculum vita with list of publications, a one-page or less statement of research interests and the names of at least two references, with their email addresses and telephone numbers to the provided email. The Materials Theory Group performs theoretical and computational research in the areas of mesoscale plasticity and dislocation dynamics, radiation effects in materials, microstructure evolution, phase field method development, phonon and electron thermal transport in crystalline solids, and computational methods for materials science and mechanics. The group has over ten graduate students and postdocs, with a wide range of collaborations.
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Hi!

I have a question regarding the beam deflection. As shown in the pic, the roller constraint is applied on the bottom of the beam(Beam A) rather than neutral axis(Beam B). Could anybody help to provide some information about Beam A hand calculation?

Thanks!

https://files.fm/u/54jwqnru#sign_up

I wonder if there is any subroutine interface to have access to nodal ( not integral point ) displacement in abaqus DURING the analysis phase.  Suppose I have a field that is going to be used in UMAT and that is dependent on  displacements of all nodes (presumably stored in an array) from the last increment. Is this possible to be implemented within Abaqus?

Thank you all !

VEMLab: a MATLAB library for the virtual element method

Release of VEMLab v2.2

>>  From VEMLab v2.1 to VEMLab v2.2:

My paper about the views of J. Den Hartog about S.P. Timoshenko has been published.

Will be pleased to hear your comments.