# Composite SiC Elasticity Tensor

Computes the orthotropic axisymmetric RZ elasticity tensor for composite (CVI) SiC/SiC with the fibers oriented in the axial direction.

## Description

The CompositeSiCElasticityTensor material model determines the elastic moduli and Poisson's ratios of composite (CVI) SiC/SiC using the correlations from Koyanagi et al. (2017).

Composite SiC/SiC is orthotropic with the fibers oriented in the axial direction. Therefore, the Young's modulus and Poisson's ratio is the same in the radial and circumferential (hoop) directions. The axial direction is different. Given the that the directionality of the material properties is inherent to cylindrical coordinates this elasticity tensor can currently only be used in axisymmetric RZ simulations.

The Poisson's ratios for composite SiC/SiC is taken as 0.13 and 0.25 in the hoop and axial directions respectively. These values are obtained from plate specimens where 0.13 corresponds to a fiber weave with 0 and 90 degree directions, and 0.25 corresponds to 45 degrees. No data exists for tube specimens so the adopted convention is approximate.

In the axial direction the Young's modulus in units of GPa depends upon the weaving angle of the fibers:

(1)

where is the fiber weaving angle with a value between 30 and 55 degrees. The Young's modulus in the hoop direction is a constant value of 160 GPa.

## Example Input Syntax

[./elasticity_tensor]
type = CompositeSiCElasticityTensor
[../]
(test/tests/tensor_mechanics/compositeSiC_mechanics/elasticity_axial.i)

## Input Parameters

• fiber_winding_angle45The angle at which the fibers in the composite are wound relative to the axial direction.

Default:45

C++ Type:double

Description:The angle at which the fibers in the composite are wound relative to the axial direction.

• computeTrueWhen false, MOOSE will not call compute methods on this material. The user must call computeProperties() after retrieving the Material via MaterialPropertyInterface::getMaterial(). Non-computed Materials are not sorted for dependencies.

Default:True

C++ Type:bool

Description:When false, MOOSE will not call compute methods on this material. The user must call computeProperties() after retrieving the Material via MaterialPropertyInterface::getMaterial(). Non-computed Materials are not sorted for dependencies.

• elasticity_tensor_prefactorOptional function to use as a scalar prefactor on the elasticity tensor.

C++ Type:FunctionName

Description:Optional function to use as a scalar prefactor on the elasticity tensor.

• base_nameOptional parameter that allows the user to define multiple mechanics material systems on the same block, i.e. for multiple phases

C++ Type:std::string

Description:Optional parameter that allows the user to define multiple mechanics material systems on the same block, i.e. for multiple phases

• boundaryThe list of boundary IDs from the mesh where this boundary condition applies

C++ Type:std::vector

Description:The list of boundary IDs from the mesh where this boundary condition applies

• blockThe list of block ids (SubdomainID) that this object will be applied

C++ Type:std::vector

Description:The list of block ids (SubdomainID) that this object will be applied

### Optional Parameters

• enableTrueSet the enabled status of the MooseObject.

Default:True

C++ Type:bool

Description:Set the enabled status of the MooseObject.

• use_displaced_meshFalseWhether or not this object should use the displaced mesh for computation. Note that in the case this is true but no displacements are provided in the Mesh block the undisplaced mesh will still be used.

Default:False

C++ Type:bool

Description:Whether or not this object should use the displaced mesh for computation. Note that in the case this is true but no displacements are provided in the Mesh block the undisplaced mesh will still be used.

• control_tagsAdds user-defined labels for accessing object parameters via control logic.

C++ Type:std::vector

Description:Adds user-defined labels for accessing object parameters via control logic.

• seed0The seed for the master random number generator

Default:0

C++ Type:unsigned int

Description:The seed for the master random number generator

• implicitTrueDetermines whether this object is calculated using an implicit or explicit form

Default:True

C++ Type:bool

Description:Determines whether this object is calculated using an implicit or explicit form

• constant_onNONEWhen ELEMENT, MOOSE will only call computeQpProperties() for the 0th quadrature point, and then copy that value to the other qps.When SUBDOMAIN, MOOSE will only call computeSubdomainProperties() for the 0th quadrature point, and then copy that value to the other qps. Evaluations on element qps will be skipped

Default:NONE

C++ Type:MooseEnum

Description:When ELEMENT, MOOSE will only call computeQpProperties() for the 0th quadrature point, and then copy that value to the other qps.When SUBDOMAIN, MOOSE will only call computeSubdomainProperties() for the 0th quadrature point, and then copy that value to the other qps. Evaluations on element qps will be skipped

• output_propertiesList of material properties, from this material, to output (outputs must also be defined to an output type)

C++ Type:std::vector

Description:List of material properties, from this material, to output (outputs must also be defined to an output type)

• outputsnone Vector of output names were you would like to restrict the output of variables(s) associated with this object

Default:none

C++ Type:std::vector

Description:Vector of output names were you would like to restrict the output of variables(s) associated with this object

## References

1. T. Koyanagi, Y. Katoh, G. Singh, and M. Snead. SiC/SiC cladding materials properties handbook. Technical Report ORNL/TM-2017/385, Oak Ridge National Laboratory, 2017.[BibTeX]