# Optimization of a laminate with a non-symetric core

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Hey Guys,

I'm trying to modelate what in formula student is called as a groove, this is a place where we take the core and unite the inner and outer layers of the monocoque (image below)

To build my model i followed the steps:

-Import a solid from the CAD, mesh the upper and bottom faces of the solid with a 2D mesh and then a 3D mesh to the solid;

-Changed the upper and lower face to another component to create the plyes, create them and the laminate.

-Create a property PSolid for the laminate and PComPP for the plyes;

-Material for the core is a Mat1 and for the plies a Mat8

-The constraints and forces are in the image below. The force is applied in a rigid at a certain distance of the laminate

The problem is when i run i have a displacement of 1e+10 and i don't understand why

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Hi,

Can you constraint all DoFs and check if that helps?

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On 11/6/2018 at 1:35 AM, JFormiga14 said:

The problem is when i run i have a displacement of 1e+10 and i don't understand why

use nonlinear solver.

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On 11/7/2018 at 6:07 AM, Mrt said:

use nonlinear solver.

On 11/7/2018 at 6:02 AM, Prakash Pagadala said:

Hi,

Can you constraint all DoFs and check if that helps?

Thanks for your answers, i already solved the problem. The upper and bottom surface are not well conected. I have another question, what is the better material card for the core since it is an aluminium honeycomb?

I am also interested in taking a force vs displacement curve of this with an increasing force. Is it possible to do in hypermesh? What should i do? Is there anything that i can check that help me doing that?

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22 hours ago, JFormiga14 said:

Thanks for your answers, i already solved the problem. The upper and bottom surface are not well conected. I have another question, what is the better material card for the core since it is an aluminium honeycomb?

﻿

I am also interested in taking a force vs displacement curve of this with an increasing force. Is it possible to do in hypermesh? What should i do? Is there anything that i can check that help me doing that?

You can model core as just solid and use MAT1 card with PSOLID property.

Force Vs displacement for linear static?

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7 hours ago, Prakash Pagadala said:

You can model core as just solid and use MAT1 card with PSOLID property.

Force Vs displacement for linear static﻿?﻿

Is what i have done.

My objective is trying to simulate a traction test and obtain the displacement with an increasing force. I think its non linear but i'm not sure

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19 hours ago, JFormiga14 said:

Is what i have done.

My objective is trying to simulate a traction test and obtain the displacement with an increasing force. I think its non linear but i'm not sure

Yeah or transient

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On 11/14/2018 at 12:14 PM, Prakash Pagadala said:

Yeah or transient

What do you think is the best option to do this with altair products (Optistruct or Radioss)

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Hi,

force vs displacement curve can be done using non-linear quasi-static analysis (NLSTAT) in Optistruct. There are a few examples:

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What is considered to be inertial effects? Is like reduction of thickness in some points?

Is it possible to model the honeycomb with the Material P9ORT, because the honeycomb have diferent resistance in compression axis and plane axis (Attached you can see the properties of the honeycomb)

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Inertial effects are due to acceleration in dynamic events: we must consider mass (inertia), i.e. sum of all forces = m*a

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You can model with MAT9ORT+ PSOLID/PCOMPLS.  As Ivan expressed that Inertia effects are due to accelerations and are considered in dynamic events. So, if you are running a linear static analysis, inertia effects will be ignored.

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