Mechanical Interface Material

The Mechanical material plugin implementation is divided in the following plugin options:

Elastic Interface

The Elastic interface material requires the following properties:

Property	Description	Type	Def. Unit	required
Kn	Normal elastic stiffness	Scalar	kPa/m	Yes
Ks	shear elastic stiffness	Scalar	kPa/m	Yes
Kt	Tangential elastic stiffness	Scalar	kPa/m	No

Example:

PropertySet
{
  id          = 'intProp',
  typeName    = 'GemaPropertySet',
  description = 'Material properties',
  properties  = {
   {id = 'Kn',   description = 'Normal elastic stiffness',  unit = 'kPa/m'},
   {id = 'Ks',  description = 'Shear elastic stiffness',  unit = 'kPa/m'},
   {id = 'Kt',  description = 'Tangential elastic stiffness',  unit = 'kPa/m'},
  },
  values = {
    {Kn = 32000000, Ks = 25000000, Kt = 25000000},
  }
}

Cohesive linear softening

The cohesive linear softening material requires the following properties:

Property	Description	Type	Def. Unit	required
Kn	Normal elastic stiffness	Scalar	kPa/m	Yes
Ks	shear elastic stiffness	Scalar	kPa/m	Yes
Kt	Tangential elastic stiffness	Scalar	kPa/m	No
Sn	Normal traction	Scalar	kPa	Yes
Ts	Shear traction	Scalar	kPa	Yes
Tt	Tangential traction	Scalar	kPa	No
ed	Equivalent separation	Scalar	m	Yes

Example:

PropertySet
{
  id          = 'intProp',
  typeName    = 'GemaPropertySet',
  description = 'Material properties',
  properties  = {
   {id = 'Kn',   description = 'Normal elastic stiffness',  unit = 'kPa/m'},
   {id = 'Ks',  description = 'Shear elastic stiffness',  unit = 'kPa/m'},
   {id = 'Kt',  description = 'Tangential elastic stiffness',  unit = 'kPa/m'},
   {id = 'Sn',  description = 'Normal traction',  unit = 'kPa'},
   {id = 'Ts',  description = 'Shear traction',  unit = 'kPa'},
   {id = 'Tt',  description = 'Tangential traction',  unit = 'kPa'},
   {id = 'ed',  description = 'Equivalent separation',  unit = 'm'},
  },
  values = {
    {Kn = 32000000, Ks = 32000000, Ks = 32000000, Kt = 32000000, Sn = 2000.0, Ts = 2000.0, ed = 0.002},
  }
}

Cohesive Exponential softening

The cohesive exponential softening material requires the following properties:

Property	Description	Type	Def. Unit	required
Kn	Normal elastic stiffness	Scalar	kPa/m	Yes
Ks	shear elastic stiffness	Scalar	kPa/m	Yes
Kt	Tangential elastic stiffness	Scalar	kPa/m	No
Sn	Normal traction	Scalar	kPa	Yes
Ts	Shear traction	Scalar	kPa	Yes
Tt	Tangential traction	Scalar	kPa	No
ed	Equivalent separation	Scalar	m	Yes
alpha	Exponential material parameter	Scalar	—	Yes

Example:

PropertySet
{
  id          = 'intProp',
  typeName    = 'GemaPropertySet',
  description = 'Material properties',
  properties  = {
   {id = 'Kn',   description = 'Normal elastic stiffness',  unit = 'kPa/m'},
   {id = 'Ks',  description = 'Shear elastic stiffness',  unit = 'kPa/m'},
   {id = 'Kt',  description = 'Tangential elastic stiffness',  unit = 'kPa/m'},
   {id = 'Sn',  description = 'Normal traction',  unit = 'kPa'},
   {id = 'Ts',  description = 'Shear traction',  unit = 'kPa'},
   {id = 'Tt',  description = 'Tangential traction',  unit = 'kPa'},
   {id = 'ed',  description = 'Equivalent separation',  unit = 'm'},
   {id = 'alpha',  description = 'Exponential material parameter',  unit = ''},
  },
  values = {
    {Kn = 32000000, Ks = 32000000, Ks = 32000000, Kt = 32000000, Sn = 2000.0, Ts = 2000.0, ed = 0.002, alpha = 4},
  }
}

Interface Mohr Coulomb

The interface Mohr Coulomb material requires the following properties:

Property	Description	Type	Def. Unit	required
Kn	Normal elastic stiffness	Scalar	kPa/m	Yes
Ks	shear elastic stiffness	Scalar	kPa/m	Yes
Kt	Tangential elastic stiffness	Scalar	kPa/m	No
Coh	Cohesion	Scalar	kPa	Yes
Phi	Angle of internal friction	Scalar	–	Yes
Psi	Angle of internal friction	Scalar	–	Yes

Example:

PropertySet
{
  id          = 'intProp',
  typeName    = 'GemaPropertySet',
  description = 'Material properties',
  properties  = {
   {id = 'Kn',   description = 'Normal elastic stiffness',  unit = 'kPa/m'},
   {id = 'Ks',  description = 'Shear elastic stiffness',  unit = 'kPa/m'},
   {id = 'Kt',  description = 'Tangential elastic stiffness',  unit = 'kPa/m'},
   {id = 'Coh', description = 'Cohesion', unit =       'kPa'},
   {id = 'Phi', description = 'Angle of internal friction', unit = ''},
   {id = 'Psi', description = 'Angle of internal friction', unit = ''},
  },
  values = {
    {Kn = 32000000, Ks = 32000000, Ks = 32000000, Coh = 500, Phi = 25.0, Psi = 20.0},
  }
}

Returns to Mechanical interface material.

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