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
what is the proof of vector addition of forces, actully how two vectors are added acccording to triangle parellelogram laws , actully i know the process but what is the source or origin of that rule who devised that and how please tell!
Hi
Isotropic hardening means, sigma_yield ll be same under both the tension (sigma_tension_yield) and compression loading(sigma_comp_yield). and the total sigma_y=sigma_tensio_yield+sigma_comp_yield.
In the case of isotropic hardening, If you increase the tensile yield strength by some means, at the same time your compressive stress ll also get increased. Hence, you get a increased radius of the yield surface. with the same shape with increased size of yield surface. and your total sigma_y ll no more remain constant. It ll get increased.
Hi every one:
I want to know How can I enter prony series for HDPE into Abaques;
Method of calculating of prony series and Experiments to do.
Best Regards
Mech.Eng. Yaser Alewe
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?
I've been trying to figure out difference between isotropic and kinematic hardening.
As I see,kinematic hardening can model reversible nbehaviour of metals (Bauschinger effect).
In isotropic hardening, the yield surface increase in size, but remain the same shape, as a result of plastic straining.
That is, if the yield surface is represented by a cylinder of radius "A" then an increase in the radius denotes an increase in the yield stress as a result of plastic straining.
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.
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