These properties define both the material parameters and the section or shell parameters.
Data->General Properties
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The model is created in reference to a global axes system XYZ that is unique for the entire problem. However, every beam must have its own local axes system X’Y’Z’ in order to:
The main property of this system is that the local X’ axis axe must have the same direction as the beam. than the beam.
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The ways for defining local axes systems are:
Note: The intuitive idea is that vertical beams have the Y’ axe in the direction of global X. All the other beams have the Y’ axe horizontal and with the Z’ axe pointing up.
Data->Local axes->Define
and with the different methods that can be chosen there. The names of the defined local axes will be added to the menu where Local axes are chosen.
Note 1 : rambshell tries to correct the local axes system if the local X’ axe does not point to the direction of the beam. It will fail if local X’ axe is orthogonal to the direction of the beam.
Note 2 : The final local axes system for every beam can be visualized in the postprocess stage. It is convenient to check the correctness of these systems after calculation is performed.
The model is created related to a global axes system XYZ that is unique for the entire problem. But every shell element must have its own local axes system X’Y’Z’ in order to:
The main property of this local axes system is that the local Z’ axe must have the same direction than the normal of the element.
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The ways for defining local axes systems are:
Note : Intuitively, this local axes system is calculated so as if element is approximately contained in the plane XY, local X’ axe will point towards global X axe. If not, this X’ axe is obtained as orthogonal to global Z axe and local Z’ axe.
Data->Local axes->Define
and with the different methods that can be chosen there. The names of the defined local axes will be added to the menu where Local axes are chosen in the conditions window.
Note 1 : rambshell tries to correct the local axes system if the local Z’ axe does not point to the direction of the normal of the element. It will fail if local Z’ axe is orthogonal to the direction of the normal.
Note 2 : The final local axes system for every shell element can be visualized in the postprocess stage. It is convenient to check the correctness of these systems after calculation is performed.
This condition is assigned to beams with its transversal section rectangular. Properties to enter are:
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Note: Remember that for an isotropic material:
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Once the values are filled in, the condition must be assigned to the beams.
The conditions that have been assigned and their local axes can be viewed with the Draw button in the conditions window .
The definition of the properties for a general beam section is very similar to that of the rectangular section. Instead of giving the width and height of the section, the area (A), the Torsor modulus (J) and the inertia modulus for the Y’ (Inertia y) and Z’ axes (Inertia z) of the beam are given. Default units for the area are m2 and for the inertia modulus are m4 .
This condition is assigned to the isotropic (homogenous) shell surfaces.
Properties to enter are:
Once the values are filled in, the condition must be assigned to the surfaces that define the shells.
The conditions that have been assigned can be viewed with the Draw button in the conditions window .
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When Plasticity is chosen as constitutive model the following data must be indicated:
Plasticity type indicate the type of plasticity chosen for the analysis. Just now only J2 Plastictity is avaibled.
Num Layer indicate the number of layer that the thickness of the shell is divided.
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To edit the properties of the Constitutive model chosen press the bottom "Edit constitutive model" . Then the following window appears
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Elastic limit indicate the maximal stress allowed with an elastic behaviour.
ISOTROPIC HARDENING inidicate the type of isotropic hardening chosen. Three type are available: Linear, Exponential, Linear+Exponential.
KINEMATIC HARDENING inidicate the type of kinematic hardening chosen. Only linear kinematic hardening is available.
Properties defined in this condition are similar to that of the shell condition. The difference is that the material is orthotropic. The orthotropy axes are the ones defined in the Local axes field of the condition. The properties to enter are the Young Modulus (Ex , Ey ), the Poisson coefficients (nuxy , nuyx ) and the Shear modulus (Gxy , Gxz , Gyz ). They are all referred to the local axes X’ and Y’.
Note: Remember that to maintain the elasticity hypothesis it is necessary to accomplish that:
Ex · nuxy = Ey · nuyx |
Default units for E and G are N/m2 and nu is non-dimensional.
Remember that for an isotropic material:
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For and orthotropic material:
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This condition is assigned to solid volumes.
Properties to enter are:
Once the values are filled in, the condition must be assigned to the volume that defines the solid.
The conditions that have been assigned can be viewed with the Draw button in the conditions window .