The aim of this post is to give a brief introduction to the recently emerged isogeometric analysis (IGA) which was presented in the seminal paper " Hughes, T.J.R.; J.A. Cottrell, Y. Bazilevs (2005). "Isogeometric analysis: CAD, finite elements, NURBS,exact geometry and mesh refinement". Comput. Methods Appl. Mech. Engrg. (Elsevier) 194: 4135–4195." IGA refers to a computational framework in which the basis functions used to represent the geometry in CAD are used for approximating the unknown fields in FEA. In this regard, IGA also employs the well known isoparametric concept.

Hi, I would like to know if it is possible in abaqus to assemble  mutually exclusive material  (as per the error message) .

Our new paper entitled "Anomalous
plasticity in the cyclic torsion of micron scale metallic wires" has been
accepted by PRL

(see:
http://prl.aps.org/accepted/3f070Y37M7a1003ff5a406b3682fb86122bc26bd4)

I need help in ANSYS 13 (Mechanical APDL interface), If anyone has an example or tutorial for modeling of reinforced concrete beam with discrete reinforcement using non-linear material definition, please provide on my E-mail: eng.karim.naguib@gmail.com

Hi all,

Hi all,

The book “Corrosion and Materials in the Oil and Gas Industries”, edited by Reza Javaherdashti, Chikezie Nwaoha and Henry Tan, has been published by CRC Press/Taylor and Francis LLC, USA.

    The book “Corrosion and Materials in the Oil and Gas Industries”, edited by Reza Javaherdashti, Chikezie Nwaoha and Henry Tan, has been published by CRC Press/Taylor and Francis LLC, USA.
http://imechanica.org/user/971

I want to use Explicit FEA in blast/impact analysis. Looking up at Ansys, it seems that it has 3 explicit code.

Why 3 separate code and more importantly what is the difference among ANSYS Explicit STR, ANSYS LS-DYNA and ANSYS AUTODYN?

Hi everybody,

I'm trying to simulate the structural behavior of High Performance Fiber Reinforced Concrete specimens by means of the Concrete Damaged Plasticity Model.

My constitutive relation is represented by a multilinear law, with a nonlinear pre-peak followed by a softening branch.

Liangliang Zhu and Xi Chen, Acta Biomaterialia (2013)       

From a mechanical instability perspective, a double-eyelid is a double-folded thin film structure on a curved substrate, caused by compression as the film “slides” on the substrate. The underlying mechanics issues, in particular the requirements for forming a double-folded structure, are studied using a modeling/simulation framework. A minimalist model is employed to explore the wrinkle-to-fold transition. Refined and enriched models are further developed based on anatomical structures, which demonstrate three critical factors for the formation of double-layer folding of the eyelid. First, a crease line in the eyelid is essential where the local bending rigidity is relatively weak. Second, the skin above the crease line should be thin and wide enough. Third, the skin below the crease line should be possessed with relatively large effective stiffness so it can be lifted as a whole when eyes open. When the eye is opened beyond about 40% of its initial wrinkle wavelength, the double-folded structure emerges. Various types of eyelid morphologies are discussed based on the mechanistic model. The study provides useful insights for surgery, cosmetics, morphogenesis, as well as microfabrication.

Simulation of the double (up) and single (down) eyelid.

"

Hello.

     Could anyone tell me how to  achieve the basic unsteady diffusion equation (Fick's second law) of some solute for a given Abaqus model by UMAT & User-defined field in Abaqus? or some other subroutines?

    Is there any reference good for this problem ?

  Thanks very much!

In using Abaqus 6.12 XFEM software is there a field output request that can be specified to track the location of the crack tip as a crack grows through time?

Dear Experimentalist Colleague:

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Aman Haque 

Hey all,

I am trying to use Drucker Prager plasticity with Tension hardening model for my material in Abaqus. In addition, I want to use the Drucker Prager creep with user defined (user) law that is via creep subroutine. But when I try to choose the Drucker Prager creep in the Abaqus CAE, it gives an error, "not all required arguments specified; expected 1, got 0." I am not able to follow what arguments it is asking for when I am using a user defined law. Any help regarding the same will be greatly appreciated. Thank you.

Hi every one . I am working on Simulation of precision glass molding process with the help of  Abaqus . Do any one have idea to simulate the glass at temprature 1400oC ? Please send me any usefull material regarding it.

Kind Regards 

Vijay 

Electroactive soft elastomers require huge electric field for a meaningful actuation. We demonstrate, by means of numerical simulation, that this can be dramatically reduced and large deformations can be achieved with suitably designed heterogeneous actuators. The mechanism by which the enhancement is attained is illustrated with the aid of both idealized and periodic models.