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Different mesh tint

Rahul_P1

Hi,

I had a quick look on the forum and I did find the answer to my problem.
So, I expound you the problem:
I am working on a 2D mesh. Sometimes the mesh, in a unique component, has two different tints (see the picture).
Then, when I export the mesh as an abaqus model and import it in abaqus, the pale elements are highlight as warnings.

Feel free to post the link of a similar topic, if one already exists.

Thank you.

Dorian

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Rahul_P1

Dorian,

What is the visualisation mode you are in? is it by mat or by prop as below? because the default colour of elements that do not have a property is the light grey colour of the elements in the bottom. so perhaps these elements do not have a property or material assigned to them.

What is the warning in abaqus (I assume you mean abaqus cae), what is the element type you are using ?

Rahul_P1

Rahul-Ponginan,

The visualization mode was by comp, but you have the same thing in the different visualization mode. Yes, it is Abaqus CAE. I am working with CPS8R element type.
I am sure (almost^^) this is not a color problem. It occurs sometimes. When I do it again and again it often disappears (changing the way to create the elements)... But now, after 5 hours I give up.

I will explain you with more details:

I am working on CT specimen for fracture propagation.
I am meshing on Hypermesh (more handy) and solving on Abaqus (more perfoment in a way)
I need to simulate the propagation, which is simulated by the translation of the meshes (which is smaller and symmetric in an area, this area is also in pale tint). So, I am working in different components (I partitioned the specimen to work faster and more easily). When I import all the elements of the different components in a unique one the difference of tint is more visible. But, even if I import the pale elements in Abaqus, they are warnings. So, I think the problem is not a elements copy. To me, it is when I create the elements that the problem occurs.

But, I am here to get others opinions because I am probably wrong. I am not abaqus or hypermesh expert...

Rahul_P1

Dorian,

What is the exact error message you get from Abaqus CAE ? Did you assign a property to each component?

In Abaqus CAE it is the Sections you have to apply on your geometry. These are the proerties in Hypermesh. If not created already. Yo can click right on your model browser and create a property as well as the material.

When you have done this step you have to assign the property to the component by right clicking on your component - assign - selecht the proerty - ok

Tell us if the warning appears although you have all properties set correctly and tell us the exact error message you get from abaqus.

Rahul_P1

Dorian,

Please follow merula`s suggestions and answer the questions in his post.

when you change to by prop and still see light grey elements it means these elements do not have a property.

I see that you are doing a second order mesh with cps8r (hypermesh quad 8) elements, the geometry are of two different colours one dark grey and the other pale, so when you automesh using the automesh panel option of 'elems to surface components' the element colours will match that of the geometry colours of the respective components. in fact you could have used 'elems to current component' after creating a particular new component so that all the elements go into this component directly without having to copy it later.

When you copy the elements from one component to another these elements will get the property of the component you copied these elements to.

Rahul_P1

all,

Sorry, Abaqus gives errors highlight and not warnings as you can see on the picture.
The errors appear when I check the mesh using the function: 'Verify mesh' (in abaqus).
Of course I have done all the settings before, but the problem is not coming from here. With this errors, the submited job won't run. It is just a consequence and not the cause.

I am sure that the problem is not coming from abaqus but from hypermesh (the previous picture was taken from hypermesh).

Rahul_P1

Dorian,

This looks like an element quality issue, The elements in the centre of your image seem very distorted and should fail most abaqus quality criteria the other elements seem from your image to fail in terms of their Aspect Ratio (This is the ratio of the longest edge of an element to its shortest edge)

Please check the elements for quality using Tool > check elems and remesh/repair the elements that fail. The Check Elems panel allow you to verify the basic quality of your elements and to verify the geometric qualities of those elements.

When you are in the abaqus user profile or when you select abaqus in the settings > solver settings > all set to, then the tool will check elements in your model as abaqus requires.

For details on how these checks are calculated for abaqus read HyperWorks Desktop Applications > HyperMesh > User's Guide > Meshing > Checking & Editing Mesh > Element Quality > How Element Quality is Calculated > Element Quality Calculation: Abaqus