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dynamic crack propagation

Submitted by llguang on

Hello everyone, I am useing the CZM method researching the dynamic crack propation problem in composites,so I must have the UEL OR VUEL of cohesive zone elements in ABAQUS or other FEM software,at this moment,  i have a UEL of ABAQUS,so i have a question ,if i want to simulate the dynamic crack problem, can i use the UEL? Or must write my VUEL?

Everyone answer is welcome

If some people have the same researching plan ,we can communicate each other!

For metals, when will the elastic modulus be changed?

Submitted by flong208 on
research

I have a question, for the same metal material, when will the elastic modulus will be changed? in another words, in what kind of processing or machine condition will the elastic modulus be changed? for example, to machine elements(gear, bearing ...), when the part surface is case hardened,will the elastic modulus be changed? if not, how can the difference of hardness between case hardened surface and without hardened substrate be reflected in FEM analysis? how can the case hardened surface parameters affect the contact stress when two part are brought to contact?

Structures in fire

Submitted by Emmanuel E. Ufuah on
research
convergence problems
Fire Modelling
heat transfer and stress analyses

Hi,

Are there researchers working on specific areas in offshore structures? Or is anyone covering the material behaviour of structures at elevated temperatures? I am indeed challenged to read about excitng contributions from different scholars expecially in structural mechanics. I realise I have just begun a race in research. You could help me gain the proper direction in research.

I shall be glad to get any response. 

Emmanuel

problems in using traction-separation laws supplied by Abaqus

Submitted by xhzeng on
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research

Abaqus supplies cohesive elements and several traction-separation laws
which can be used to study crack problems. In studying a mode I crack
problem (see Fig.1), the cohesive interfaces in front of the crack tips
(both sides) are represented by cohesive elements. The size of the bulk
material is taken as 6x6 mum and the size of cohesive elements is 2x2
nm (or 10x10 nm). The constitutive response in the cohesive element is
described by a triangle-type traction-separation law, where  maximum
stress or displacement is chosen as the failure criterion of the

Modelling offshore platform deck in fire

Submitted by Emmanuel E. Ufuah on
NLGEOM

Hello fellow researchers,

I am almost completing my first year in research study and am finding it difficult running my structural simulation in ABAQUS once I have included non-linear geometric effects. I didn't have problem with the simple heat transfer analysis. I have also converted (--) to the true stress-logarithmic strain curves at elevated temperatures using the empirical model given in EC3, yet no good outcome. Can anyone suggest to me how I could go about it?

Comments will be gratefully appreciated.

Finite strain finite element formulation

Submitted by Sugeng Waluyo on

Hi ,

 

I am working with finite strain finite element formulation. Normaly, the weak form is derived from equilibrium at a reference configuration or differential of 1st piola-kirchoff stress tensor. In case, we have 10 steps of load increment, is it necessary to update nodal position or nodal coordinate for each step??. I am using newton-raphson method.  

 

best regards,

sugeng

 

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