FEM

Check out Dr. Tim Fuller's work athttp://nbviewer.ipython.org.

-- Biswajit

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Help needed!! in Abaqus

我有UMAT写入更新压力和材料tangent components for a user defined material model. I need stretch ratio as an input for my material model. For this I am using deformation gradient from UMAT. Problem is, when there is constant strain (strain rate = 0), for example when material stretched to 100% strain (rubber) and then held at that strain for certain time to see stress relaxation, the deformation gradient should give the same value of 100% strain, but to my surprise this is changing. Can any one help me with this.

Hi,

I'm now start to learn cohesive zone model based FEM for crack problems. According the a regular coehsize model (bilinear for example), the relative displacement and the cohesive stress are both unknwon, so iteration is required. My question is that what are the regular iteration steps?

Thanks.

Hello,

I have to do a FEA regarding impact damage and delamination propagation in a CFRP specimen.

I have to do this using cohesive element in order to see the propagation of the delamination front in the material.

My problem is that I don't know how to do this in Abaqus.

I'll better explain: I can use this software but is the first time approching composite behavior and I really don't know how to model that.

I am modeling a plate under three point bending with Abaqus. The plate
is a sandwich structure with aluminum plate (thickness: 5mm), adhesive glue (thickness:
0.02mm) and a kind of foam (thickness: 15mm) bonding together. Their Young’s
米odulus is at the order of 100GPa, 1MPa and 100MPa. While in incremental
calculation, the job is always be aborted for not achieving convergence. I just
wonder whether the cause of not achieving convergence should be attributed to
the huge difference in Young’s modulus.

800x600

Hello,

Hello Everyone,

I have to simulate and find the pressure on the splines in the universal joint. I have to define contact surface and to find a simple method to run analysis on this joint. I am finding it very difficult to select all the surface on every spline. Also, it will make the simulation very big.

Could anyone please help me to find a method or an easy way out. Any kind of suggestions are most welcome.

Regards

Prahel

Hello,

I guess I know how to descretize and further processing but how can I make or define my sample for example(tensile sample) in fortran.

Dear colleagues,

I have one question concerning the TSHR (transverse shear stresses) output request in application of Thick Shell S8R elements in Abaqus/standard.

the follow qarning occurs:Output request tshr is not available when *transverse shear stiffness is specified on the *shell section definition or a material in the shell has been defined without *elastic

Can anybody please help with an advioce or two, on how to solve this?

all the best

Matej

New web page of Finite Element Analysis software Z-set is now open:http://zset-software.com/
What is Z-set

Z-set is a computational code devoted to the analysis of material and
structure behavior, involving a finite element solver and a collection
of specific tools for material parameter calibration, preprocessing and
postprocessing computations. Z-set is the result of 30 years of close collaboration between the

Hello All:

I have written a UMAT code to predict the viscoelastic behaviour within a shape adaptive structure. I have followed similar steps used in Abaqus subroutine manual, I have applied this UMAT to a single quad element and it works as predicted. But when I apply it multiple elements model it breaks down.

Is there any special command i need to put in UMAT subroutine to account multi element analysis? I will appreciate all related comments,

Thanks

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.