Body loads

• Volume flux (load)

  DeadWeight

  components #(ra)

  
  
  Represents dead weight loading applied on element volume (for structural elements). For transport problems, it represents the internal source, i.e. the rate of (heat) generated per unit volume. The magnitude of load for specific i-th DOF is computed as product of material density, corresponding volume and i-th member of components array.

• Structural temperature load

  StructTemperatureLoad

  components #(ra)

  
  

  Represents temperature loading imposed to some elements. The members of components array represent the change of temperature (or change of temperature gradient) corresponding to specific element strain components. See element library manual for details.

• Structural eigenstrain load

  StructEigenstrainLoad

  components #(ra)

  
  Prescribes eigenstrain (or stress-free strain) to a structural element. The array of components is defined in the global coordinate system. The number of components corresponds to a material mode, e.g. plane stress has three components and 3D six. Periodic boundary conditions can be imposed using eigenstrains and master-slave nodes. Consider decomposition of strain into average and fluctuating part

  $$\boldsymbol{\varepsilon }(\boldsymbol{x}) = \langle \boldsymbol{\varepsilon } \rangle + \boldsymbol{\varepsilon }^*(\boldsymbol{x})$$ (4.1)

  
  
  where $\langle \boldsymbol{\varepsilon } \rangle$ can be imposed as eigenstrain over the domain and the solution gives the fluctuating part $\boldsymbol{\varepsilon }^*(\boldsymbol{x})$. Master-slave nodes have to interconnect opposing boundary nodes of a unit cell.