FEA Material

Structure for the material tuple = ("Material Name", "Value"). "Material Name" defines the reference name for the material being specified. The "Value" can either be a JSON String dictionary (see Section JSON String Dictionary) or a single string keyword (see Section Single Value String).

JSON String Dictionary

If "Value" is JSON string dictionary (e.g. "Value" = {"density": 7850, "youngModulus": 120000.0, "poissonRatio": 0.5, "materialType": "isotropic"}) the following keywords ( = default values) may be used:

• materialType = "Isotropic"
  Material property type. Options: Isotropic, Anisothotropic, Orthotropic, or Anisotropic.

• youngModulus = 0.0
  Also known as the elastic modulus, defines the relationship between stress and strain. Default if ‘shearModulus’ and ‘poissonRatio’ != 0, youngModulus = 2*(1+poissonRatio)*shearModulus

• shearModulus = 0.0
  Also known as the modulus of rigidity, is defined as the ratio of shear stress to the shear strain. Default if ‘youngModulus’ and ‘poissonRatio’ != 0, shearModulus = youngModulus/(2*(1+poissonRatio))

• poissonRatio = 0.0
  The fraction of expansion divided by the fraction of compression. Default if ‘youngModulus’ and ‘shearModulus’ != 0, poissonRatio = (2*youngModulus/shearModulus) - 1

• density = 0.0
  Density of the material.

• thermalExpCoeff = 0.0
  Thermal expansion coefficient of the material.

• thermalExpCoeffLateral = 0.0
  Thermal expansion coefficient of the material.

• temperatureRef = 0.0
  Reference temperature for material properties.

• dampingCoeff = 0.0
  Damping coefficient for the material.

• yieldAllow = 0.0
  Yield strength/allowable for the material.

• tensionAllow = 0.0
  Tension allowable for the material.

• tensionAllowLateral = 0.0
  Lateral tension allowable for the material.

• compressAllow = 0.0
  Compression allowable for the material.

• compressAllowLateral = 0.0
  Lateral compression allowable for the material.

• shearAllow = 0.0
  Shear allowable for the material.

• allowType = 0
  This flag defines if the above allowables compressAllow etc. are defined in terms of stress (0) or strain (1). The default is stress (0).

• youngModulusLateral = 0.0
  Elastic modulus in lateral direction for an orthotropic material

• shearModulusTrans1Z = 0.0
  Transverse shear modulus in the 1-Z plane for an orthotropic material

• shearModulusTrans2Z = 0.0
  Transverse shear modulus in the 2-Z plane for an orthotropic material

• kappa = 0.0
  Thermal conductivity for an isotropic solid

• K = [0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
  Thermal conductivity for an anisotropic solid (KXX, KXY, KXZ, KYY, KYZ, KZZ)

• specificHeat = 0.0
  Specific heat constant pressure (per unit mass) for an isotropic solid

• Gij = (no default)
  List of Gij material properties (e.g. [G11, G12, G13, G22, fG23, G33]). Length must be 6.

• honeycombCellSize = NULL
  Honeycomb sandwich core cell size. Required if material defines the core of a honeycomb sandwich and dimpling stability index is desired

• honeycombYoungModulus = NULL
  Honeycomb sandwich core Young's modulus used for stability index analysis

• honeycombShearModulus = NULL
  Honeycomb sandwich core shear modulus used for stability index analysis

• fractureAngle = NULL
  Fracture angle for uniaxial transverse compression in degrees. Used in the NASA LaRC02 failure theory only

• interlaminarShearAllow = NULL
  Allowable inter-laminar shear stress of the composite laminate bonding material

• fiberYoungModulus = NULL
  Modulus of elasticity of fiber

• fiberPoissonRatio = NULL
  Poisson's ratio of fiber

• meanStressFactor = NULL
  Mean stress magnification factor

• transTensionSlope = NULL
  Failure envelop slope parameter for transverse tension

• transCompressionSlope = NULL
  Failure envelop slope parameter for transverse compression

• compositeFailureTheory = NULL
  Composite failure theory (string value)

• interlaminarNormalStressAllow = NULL
  Allowable inter-laminar normal stress of the composite laminate bonding material (allowable interlaminar normal stress)

• youngModulusThick = NULL
  Modulus of elasticity in thickness direction, also defined as the matrix direction or 3-direction

• poissonRatio23 = 0.0
  Poisson's ratio ( for uniaxial loading in 2-direction)

• poissonRatio31 = 0.0
  Poisson's ratio ( for uniaxial loading in 3-direction)

• youngModulusFactor = NULL
  Longitudinal modulus of elasticity reduction scale factor for nonlinear composite Progressive Ply Failure Analysis (PPFA)

• youngModulusLateralFactor = NULL
  Lateral modulus of elasticity reduction scale factor for nonlinear composite Progressive Ply Failure Analysis (PPFA)

• shearModulusFactor = NULL
  In-plane shear modulus reduction scale factor for nonlinear composite Progressive Ply Failure Analysis (PPFA)

• shearModulusTrans1ZFactor = NULL
  Transverse shear modulus reduction scale factor in 1-Z plane for nonlinear composite Progressive Ply Failure Analysis (PPFA)

• shearModulusTrans2ZFactor = NULL
  Transverse shear modulus reduction scale factor in 2-Z plane for nonlinear composite Progressive Ply Failure Analysis (PPFA)

Single Value String

If "Value" is a string, the string value may correspond to an entry in a predefined material lookup table. NOT YET IMPLEMENTED!!!!