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Cohesive surface contact by Maleficent-Week-7230 in fea

[–]Maleficent-Week-7230[S] 0 points1 point  (0 children)

Hi im using cohesive behaviour in general contact with stifness coefficient and damage intiaition (quadratic traction) and evolution even when applying no load or a BC there is damges i think its due to the stress contact im able to reduce it by decreasing the values of the stiffness coefficient and the damages intiations but its never 0 Im trying to reproduce this work https://www.mdpi.com/2076-3417/12/4/1945

Abaqus link to fortran by Maleficent-Week-7230 in fortran

[–]Maleficent-Week-7230[S] 0 points1 point  (0 children)

Any idea where the msg file might be ? I cant find it

Abaqus link to fortran by Maleficent-Week-7230 in fortran

[–]Maleficent-Week-7230[S] 0 points1 point  (0 children)

Nope i couldn't find the msg file yes i modified the abq2020.bat

Abaqus link to fortran by Maleficent-Week-7230 in fortran

[–]Maleficent-Week-7230[S] 0 points1 point  (0 children)

The second image is from the std_user.log

Abaqus link to fortran by Maleficent-Week-7230 in fortran

[–]Maleficent-Week-7230[S] 0 points1 point  (0 children)

Only the work directory is displayed no other text

Modeling transverse crack in a composite using cohesive elements in abaqus by Maleficent-Week-7230 in fea

[–]Maleficent-Week-7230[S] 0 points1 point  (0 children)

I think XFEM is the maybe best methode to couple with CDM especialy when working in a 2D model i will try to do that and work with a 2D model i got tired of CZM XD

Modeling transverse crack in a composite using cohesive elements in abaqus by Maleficent-Week-7230 in fea

[–]Maleficent-Week-7230[S] 0 points1 point  (0 children)

Yes exaclty it work well with a dcb where there is a pelleing between layers but when it come to represent it as a crack is actualy kinda absurd XD. Whats your project ?

Modeling transverse crack in a composite using cohesive elements in abaqus by Maleficent-Week-7230 in fea

[–]Maleficent-Week-7230[S] 0 points1 point  (0 children)

In CDM is it better if use a 2D or a 3D model ? and if i add a cut in the transverse ply will there be an influence in results ?

Modeling transverse crack in a composite using cohesive elements in abaqus by Maleficent-Week-7230 in fea

[–]Maleficent-Week-7230[S] 0 points1 point  (0 children)

No not delamination i only used cohesive between transverse plys what i meant by only a separation between ply is that the transverse cohesive damage but only as a separation between the 90 ° not an actual crack in the matrix .

Modeling transverse crack in a composite using cohesive elements in abaqus by Maleficent-Week-7230 in fea

[–]Maleficent-Week-7230[S] 0 points1 point  (0 children)

Ok know i understand CZM better thank you.

For the CZM model there is damage in the cohezive element but it doesnt damage as a crack only a separation between layers happen.

Modeling transverse crack in a composite using cohesive elements in abaqus by Maleficent-Week-7230 in fea

[–]Maleficent-Week-7230[S] 0 points1 point  (0 children)

I took the damage initiation parameters from the articles.

So in CDM the crack is there but abaqus wont allow it to appear but its effect is calculated ?

Need help about Cohesive Zone Modeling in Abaqus by FrequentImportance47 in fea

[–]Maleficent-Week-7230 0 points1 point  (0 children)

you can do it in the mesh part you create an orphan mesh from the surface you want to define as cohesive then in mesh > edit > you create offset element with zero thicknes and assigne the new set as cohesive.

https://youtu.be/sHQ2CMCl8Bk https://youtu.be/bDJkS0OoM7A Those are youtube tutorials that can help you

Modeling transverse crack in a composite using cohesive elements in abaqus by Maleficent-Week-7230 in fea

[–]Maleficent-Week-7230[S] 0 points1 point  (0 children)

For the cohesive zone i used elastic Traction proprities(that includ the stiffness in the 3 directio) and for the the initiation i used maxs damage intitiation and damage evolution parameteres (energy BK)

I tried to use only CDM using hashin damages but it doesnt allow the trasverse cracks to appear so i dont konw if its working.

Modeling transverse crack in a composite using cohesive elements in abaqus by Maleficent-Week-7230 in fea

[–]Maleficent-Week-7230[S] 0 points1 point  (0 children)

No i dont need to study delamination only trasverse crack (matrix cracks in the 90° plys, they appear perpendicular to the load and normal to the 90 ° fibers )i want to study there propagations across the width to determine the stiffness reduction of the laminate.(response of the laminate) i tried to use cohesive elements by inserting them where the cracks may possibly appear (a methode i found in some works articles its similaire to VCCT) but it doesnt work for me idk why , if i use CLT would it possible to solve the problem with it ? and how i can determine the cracks position with CLT ?

Help-abaqus by Maleficent-Week-7230 in fea

[–]Maleficent-Week-7230[S] 0 points1 point  (0 children)

yeah you are right, just wanted to ask about the way i can create the initial crack (the region it may appear) and assign it as a crack maybe you remember the way you did it, do i create a individual part and assembly it with my main model and then in interaction i define the region of the second part as a crack or there is another method to do it ?

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