Learning Forum

[guoking2019]

I need to define the orthotropic  material properties of a tube wall in ansys mechanical apdl , by  either GUI or APDL commands.

The tube looks like this.

figure1.tube wall

And the stress-strain curves are convex like in both longitudinal and circumferential direction.

figure2.stress strain curve .Just for description of the shape.

Presently ,I want to input the orthotropic nonlinear data into ansys to build the material property models . However , as far , I have not found the manner to do it.In GUI,the orthotropic option under Structural/Linear/Elastic can only be input the linear data. In APDL , the TB command is just followed the curve points along only one direction.

So , how can I input the orthotropic nonlinear elastic data in both directions? 

[jj77]

What type of orthotropic nonlinear data, is it metal plasticity (e.g., Hill's) or more like rubber or composite nonlinear elastic properties?

 

Assuming it is anisotropic metal palsticity - ansys has the Hill model .

(copy paste this into the ansys help browser : https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v192/ans_arch/old_TB_HILL.html?q=Hill)

If it is related to hyperelastic material - ansys anisotropic hyperelasticity model.

(https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v192/ans_mat/aQw8sq22dldm.html%23anhyper1g)

[guoking2019]

What type of orthotropic nonlinear data, is it metal plasticity (e.g., Hill's) or more like rubber or composite nonlinear elastic properties?

Assuming it is anisotropic metal palsticity - ansys has the Hill model .

(copy paste this into the ansys help browser : https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v192/ans_arch/old_TB_HILL.html?q=Hill)

If it is related to hyperelastic material - ansys anisotropic hyperelasticity model.

(https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v192/ans_mat/aQw8sq22dldm.html%23anhyper1g)

 

I'd love to  reply your answer.It is neither metal plasticity nor rubber like hyperelasticity . Instead, it mostly seems like orthotropic nonlinear elasticity.

I still thanks you a lot .I have assumed it as the hyperelasticiy ever.But I  just get the stress-strain curves of uniaxial or biaxial stretch experiments,which are deficient to suffice the fitting for any hyperelasticity model.Because it at least requires the compression test and volumetric test.

Indeed,the primary obstacle is ,how to input orthotropic nonlinear data?Every direction of the orthogonal three is followed by a data table,which is what  I really want.Thanks again.