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Why penetrable model can be assumed in random?

Submitted by victorye on
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homogenization
microstructure
composite

There is a lot of homogenization theories based on penetrable model or some other name like 'overlapping', 'randomly imbedded model' to analyze random microstructure. In reality, the fibers or inclusions can not be penetrated into each other, so why they use this assumption anyway?

 

 

 Thanks for your opinion.

Constitutive model for the glass fiber reinforced-epoxy composite

Submitted by dubuking on
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ABAQUS
Constitutive model
epoxy
woven fabric

Dear all,

 

I'm a researcher in the area of applied mechanics. Currently, I'm surveying articles on the constitutive and numerical modeling of fiber reinforced polymer composite. In particular, the fiber is a glass woven fabric. The matrix is the epoxy (thermoset which shrinkages when curing is completed). I want to know woks relevant to this kind of materials. I have found some "compressible hyperelastic model" which is for the epoxy only. Any comments or suggestions will be welcomed!

 

Best regards, 

Sangyul Ha

How do ductile materials fail?

Submitted by benzerga on
research
fracture
Plasticity
viscoplasticity
Computational Modeling
experiments
mathematical modeling
localization
Voids

The published version may be accessed at

https://www.researchgate.net/publication/251448926_Ductile_Fracture_by_…

Since then, two other reviews were co-authored by me:

For Acta Materialia:

https://www.researchgate.net/publication/289140144_Failure_of_Metals_I_…

And for IJF @ 50

https://www.researchgate.net/publication/305694679_Ductile_failure_mode…

Prony series for viscoelasticity in Abaqus.

Submitted by priyadd84 on
research

Hi all,

     My first question is i have a set of stress Vs strain data for different strain rates (100/s to 350/s). Can prony series be extracted using these data? Or is there a way in Abaqus i can enter directly this data?

    After reading for a while a came to know that stress relaxation data is needed for defining pony series. My second question is can stress relaxation data can be obtained for high strain rates in the order of 100 to 350/s?

Thanks all 

 

Parts from two diffterent models need to be combined into one entirely new model

Submitted by PrinceUS on
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Dear all,

 

I have two two model each is containing one part. I want to bring those two parts  from the two model into one entirely new model. It would be highly appreciable if  anyone of you kindly give a solution of this issue.,

 

Best Regards

 

Ariful

A question on Residual Load Vector in Abaqus User Element Subroutine implementation

Submitted by Gurudutt Chand… on
research

Hello all,

 

I am implementing a Finite Shell element in Abaqus as a User Element.  I have a question regarding the Residual Lod vector that has to be defined in the User Element Subroutine.  

We know that K(du)=R-f       where R is the external force vector at time t+dt

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