research

Many engineering devices and natural phenomena involve gels that swell under the constraint of hard materials. The constraint causes a field of stress in a gel, and often makes the swelling inhomogeneous even when the gel reaches a state of equilibrium. To analyze inhomogeneous swelling of a pH-sensitive gel, we implement a finite element method in the commercial software ABAQUS.  The program is attached here.  Contact Shenqiang Cai (shqcai [at] gmail.com) for a description of the program.

I think a non-zero entry in the stiffness matrix doesn't necessarily imply dependence of ith DOF on the jth DOF. This is the case also for standard FEM (without any enrichments). For example for a quadrilateral 2D element the x component of displacement has interaction with y component at each node, but as we know, two independent values of translation in x and y directions can

Dear Guys

Is there any one that can help me for below questions?

1- Modeling FRP in abaqus CAE

2- Define interaction between FRP layer and concrete wall

Regards

M.Mojtahedpour

Dear Sir，

As we know, periodic signals are best analysed in the frequency domain while stochastic signals are usually more profitably analysed in the time domain. The analysis in the frequency domain usually concern only one signal while in the time domain often involves the comparison of several different signals.

1) what are the general methods for transforming the frequency domain into time domain, and which should be superior?

There is a basic problem in NATURE of approximation of discontinuity in element using XFEM.I tried to illustrate that below:

for example, If you consider an element with strong discontinuity( like fracture or contact) which usually we use heaviside function as enrichment function. we expect two parts of element deform independently because of nature of problem.



In equation for approximation of this element we have two main parts. First  is 'regular' or 'standard' part which uses the standard shape functions of element and Second is the enriched part.

Mechanical tension contributes to clustering of neurotransmitter vesicles at presynaptic terminals. 

Scott Siechen, Shengyuan Yang, Akira Chiba and Taher Saif

Proceedings of the National Academy of Sciences,   August 4, 2009   vol. 106   no. 31   12611–12616 

http://www.pnas.org/gca?gca=pnas%3B106%2F31%2F12611&allch= 

I was wondering if anyone has solved a “sequentially coupled thermal stress analysis” problem using ABAQUS?

If so, here is what I am looking to solve.

Let’s assume we solved for the temperature (T) as a function of time and space using the transient heat transfer analysis given certain BCs.

sir,

I am solving some problomes for Stresses around holes for Anisotropic cases. In this connection most of authors have solved the stresses in cartesian co-ordinates only. Can I have any papers which are solved in polar co-ordinates by Stroh formalism for Stresses around holes in Composite laminates.So kindly help me

thanking you

 M.Ramesh Babu