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Very fundamental questions on XFEM

Submitted by bruno-page on
Forums
Computational Mechanics Forum

1)XFEM is suitable in simulatng crack propogation problem because using conventional FEM this

would have required repeated meshing.This is what I've read in most introductory chapters regarding XFEM but what is

its application beyond crack propogation studies?

2)Parttion of unity framework:The main idea is to construct basis functions as products of piecewise shape functions

and local enriched basis functions.But my question is how the concept works in exactly smulating the requirement of

Shape of meniscus

Submitted by dirtbiker1824 on
Forums
Fluid Mechanics Forum

Hello All,

I am trying to find the governing equation to the shape of a meniscus outside of a small cylinder. I know that by solving the youngs-laplace equation this equation can be derrived, but that is beyond me. I need the equation to be height of meniscus as a function of radius. Any insight to this would be appriciated.

Thanks

Experimental analysis of prepreg tack

Submitted by LECAM on
research
Composites
tack
tackiness
prepreg
probe tack test

Dear all, I post a study dealing with tack of prepreg materials. This kind of composite materials is increasingly used in the design of structural parts, particularly in the aerospace industry.Tack is one of the major properties that governs the ability of prepreg to be laid up. To investigate this property, we have developed a probe tack test to evaluate the effect of the temperature, the contact time, the contact force and the debonding rate on it.

How to explain the limit load by stiffness matrix using finite element analysis?

Submitted by pfliu@zju.edu.cn on
research
convergence stiffness matrix finite element analysis

I always have a question about the convergence problem: when a structure reaches its maximum load-bearing ability, the solution will end if the newton method is used in the finite element analysis. Then which form the stiffness stiffness in the finite element analysis takes on?  Singular or ill-conditioning?  How to explain the appearance of maximum load by variable stiffness matrix?

Young's modulus

Submitted by wanbot on
Forums
Ask iMechanica

Hi all,

I have this confusing thought for a quite long time. 

Is there any relation between the time-independent Young's modulus with
the time-dependent Young's modulus (instantaneous and equilibrium
moduli or loss and storage moduli)?

If yes, what is the equation to relate them?

So many terminologies which make this confusion!

Please help.

Wanbot

Modelling Hyper-elastic Plate Using ABAQUS

Submitted by J Mahmud on
research
ABAQUS
FEA
Hyperealstic material

Dear All,

For months, I have tried to model a plate with circular hole which has the properties of hyper-elastic material (Ogden) but the results are still not promising compared to literature (Y Basar 1998).  The main problems are:

1. The maximum load I succeeded to apply was q=26, while literature had applied load up to 90. For q > 26, the analysis will terminate with errors such as too many attempt, excessive distortion etc.

2. The results I get for q<26 are not the same as literature. 

I attach my best result for your viewing.

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