PlateFiber and J2PlateFiber nDMaterials

[alfonsogdr]

Hello, I have a question related with J2PlateFiber and with PlateFiber nDMaterials. At the source code in the method setTrialStrain(), which is called by SectionForceDeformation object (in my case I am using MembranePlateFiberSection), when it creates the strain tensor with the strains_from_element I don't know why strain(1,2)=strain(2,1)=0.5*strain_from_element(3) and strain(0,2)=strain(2,0)=0.5*strain_from_element(4), shouldn't it be the other way around? Because strain_from_element(3) is EpsXZ and strain_from_element(4) is EpsYZ isn't it? This also hapens when it creates the stress tensor. Thank you very much, there may be something I am missing.

[mhscott]

Those are shear deformations from the plate section, not material strains at a point.

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[alfonsogdr]

Those are shear deformations from the plate section, not material strains at a point.

Thank for your answer Prof. Scott. In the case of MembranePlateFiberSection strain_from_element(3)=root(5/6)*strainResultant(6) where strainResultant(6) is EpsXZ from the element and strain_from_element(4)=root(5/6)*strainResultant(7) where strainResultant(7) is EpsYZ so I thought that those shear deformations from the plate section should be also in XZ and YZ planes respectively. Again, maybe there is something I am missing. Thank you very much.