Plot Variables

The following plot variables are available in FEBio:

variable	description	module
acceleration	Average element accelerations	solid
Almansi strain	Almansi strain tensor	solid
beam curvature	the curvature vector of a beam element	solid
beam reference stress	the stress vector in the reference frame of a beam element	solid
beam reference stress couple	the stress couple vector of a beam element in the reference frame	solid
beam strain	the strain vector of a beam element	solid
beam stress	the stress vector of a beam element	solid
beam stress couple	the stress couple vector of a beam element	solid
body force	the total body force vector applied to a solid element	solid
concentration gap	The concentration gap across a biphasic contact interface.	solute
contact area	Net contact area across contact interface. Evaluated by integrating the surface area at integration points where the contact pressure is not zero.	solid
contact force	Net contact force across contact interface. Evaluated by integrating the contact traction over the contact surface.	solid
contact gap	Contact gap distance, evaluated at contact surface faces	biphasic
contact penalty	Contact penalty value	solid
contact pressure	Contact pressure, evaluated at contact surface faces	solid
contact status	The nr. of integration points of the surface element that are considered in contact.	solid
contact stick	Stick status in stick-slip frictional contact (1=stick, 0=slip). Values between 0 and 1 imply that a fraction of that face is in stick mode. Currently works only with sliding-tension-compression.	solid
contact traction	Contact traction vectors, evaluated at contact surface faces	solid
continuous damage	the accumulated damage variable in a continuous-discontinuous damage model	solid
continuous damage beta	the \(\beta\) parameter in a continuous-discontinuous damage model	solid
continuous damage D1	the D1 parameter in a continuous-discontinuous damage model	solid
continuous damage D2	the D2 parameter in a continuous-discontinuous damage model	solid
continuous damage D2beta	the D2beta parameter in a continuous-discontinuous damage model	solid
continuous damage D3	the D3 parameter in a continuous-discontinuous damage model	solid
continuous damage Ds	the Ds parameter in a continuous-discontinuous damage model	solid
continuous damage gamma	the \(\gamma\) parameter in a continuous-discontinuous damage model	solid
continuous damage P	the P parameter in a continuous-discontinuous damage model	solid
continuous damage Psi0	the \(\Psi_0\) parameter in a continuous-discontinuous damage model	solid
current density	Electric current density	solute
current element angular momentum	The element's total angular momentum at the current configuration.	solid
current element center of mass	The element's center of mass at the current configuration.	solid
current element kinetic energy	The element's total kinetic energy at the current configuration.	solid
current element linear momentum	The element's total linear momentum at the current configuration	solid
current element strain energy	The element's total strain energy at the current configuration.	solid
damage	Damage variable D	solid
deformation gradient	The deformation gradient \(\mathbf{F}\)	solid
density	The current density	solid
Deshpande-Fleck stress	Element yield stress based on Deshpande-Fleck criterion	solid
deviatoric elasticity	The deviatoric elasticity tensor of an uncoupled material	solid
deviatoric fiber stretch	Deviatoric fiber stretch \(\tilde{\lambda }\) in a fiber material	solid
deviatoric strain energy density	Deviatoric strain energy density \(\tilde{\Psi}\left(\mathbf{\tilde{C}}\right)\)	solid
deviatoric strong bond SED	Strain energy density of strong bonds in reactive viscoelastic material	solid
deviatoric weak bond SED	Strain energy density of weak bonds in reactive viscoelastic material	solid
dilatation gradient	gradient of J in biphasic-FSI	fluid
discrete element direction	Unit vector along direction of discrete element	solid
discrete element elongation	Change in length of the discrete element (i.e. \(\Delta L = L_t - L_0\))	solid
discrete element force	the vector force in the discrete element	solid
discrete element length	Current length of the discrete element	solid
discrete element percent elongation	ratio of change in length over original length	solid
discrete element signed force	The dot product of the force and the element's direction vector.	solid
discrete element strain energy	strain energy of the discrete element's material	solid
discrete element stretch	Current stretch of the discrete element (i.e. \(\lambda = L_t / L_0\))	solid
displacement	Nodal displacements	fluid
Drucker shear stress	Element yield stress based on Drucker shear stress criterion	solid
Drucker-Prager stress	Element yield stress based on Drucker-Prager criterion	solid
edge contact gap	the contact gap of an edge-to-surface contact interface.	solid
effective elasticity	The elasticity of the elastic material in a biphasic/triphasic/multiphasic material.	biphasic
effective fluid pressure	Fluid pressure p for biphasic materials, or \(\tilde{p}\) for biphasic-solute	fluid
effective friction coefficient	Effective friction coefficient at a biphasic contact interface	biphasic
effective shell fluid pressure	fluid pressure for biphasic, biphasic-solute, triphasic, and multiphasic materials of shell domains.	biphasic
effective shell solute concentration	Effective solute concentration for biphasic-solute, triphasic, and multiphasic materials of shell domains.	solute
effective solute concentration	Effective solute concentration \(\tilde{c}\) for biphasic-solute materials	solute
elastic fluid pressure	Element elastic fluid pressure	fluid
elasticity	Spatial elasticity tensor components	solid
electric potential	Electric potential \(\psi\) in triphasic/multiphasic materials	solute
element angular momentum	Element total angular momentum	solid
element center of mass	Element center of mass	solid
element kinetic energy	Element total kinetic energy	solid
element linear momentum	Element total linear momentum	solid
element strain energy	Element total strain energy	solid
element stress power	Element total stress power	solid
enclosed volume	Volume enclosed by named surface	solid
enclosed volume change	Change in volume enclosed by named surface	solid
Euler angle	Rigid body Euler angles	solid
facet area	The area of the surface element in the deformed configuration.	solid
fatigue bond fraction	fatigue bond fraction in a reactive-viscoelastic material	solid
fiber stretch	Element's average fiber stretch	solid
fiber vector	Material fiber vector	solid
field	Output the nodal values of a field variable.	core
fixed charge density	Fixed charge density \(c^{F}\) in current configuration	solute
fluid acceleration	Fluid acceleration (material time derivative of fluid velocity \(\mathbf{v}^{f}\)	fluid
fluid body force	The element's average body force applied to the element.	fluid
fluid bulk modulus	The element's average bulk modulus, calculate from the pressure.	fluid
fluid density	Fluid density \(\rho^{f}\) in fluid and fluid-FSI materials	fluid
fluid density rate	The element's average fluid density rate.	fluid
fluid dilatation	Fluid dilatation \(e\)	fluid
fluid element angular momentum	Total angular momentum of fluid element	fluid
fluid element center of mass	Center of mass of fluid element	fluid
fluid element kinetic energy	Total kinetic energy of fluid element	fluid
fluid element linear momentum	Total linear momentum of fluid element	fluid
fluid element strain energy	Total strain energy of fluid element	fluid
fluid energy density	Average energy density of fluid element	fluid
fluid flow rate	Volumetric fluid flow rate \(Q=\int_{A}\mathbf{w}\cdot\mathbf{n}\,dA\) across a named surface (biphasic and multiphasic analyses)	fluid
fluid flux	Fluid flux \(\mathbf{w}\) in biphasic, biphasic-solute, triphasic/multiphasic, fluid-FSI and biphasic-FSI materials.	fluid
fluid force	Net fluid force across biphasic (sliding-biphasic), biphasic-solute (sliding-biphasic-solute) and multiphasic (sliding-multiphasic) contact interface. Evaluated by integrating the fluid pressure p over the contact surface.	biphasic
fluid force2	Alternative calculation of the net fluid force	biphasic
fluid heat supply density	Average heat supply density of a fluid element	fluid
fluid kinetic energy density	Average kinetic energy densify of a fluid element	fluid
fluid load support	The total fluid load support across a named surface	biphasic
fluid mass flow rate	Mass flow rate across a named surface, \(\dot{m}=\int_{A}\rho\mathbf{v}\cdot\mathbf{n}\,dA\)	fluid
fluid pressure	Fluid pressure \(p\) in biphasic, biphasic-solute, triphasic/multiphasic materials, and fluid materials	fluid
fluid pressure tangent strain		fluid
fluid rate of deformation	Fluid rate of deformation tensor \(\mathbf{D}\)	fluid
fluid relative Reynolds number		fluid
fluid shear stress error		fluid
fluid shear viscosity	Average shear viscosity of a fluid element	fluid
fluid specific entropy		fluid
fluid specific free energy		fluid
fluid specific free enthalpy		fluid
fluid specific gauge enthalpy		fluid
fluid specific internal energy		fluid
fluid specific strain energy		fluid
fluid strain energy density	Average shear energy density of fluid element	fluid
fluid stress	Fluid stress \(\boldsymbol{\sigma}\)	fluid
fluid stress power density	Fluid stress power \(\boldsymbol{\sigma}:\mathbf{D}\)	fluid
fluid surface energy flux	The total energy flux across a named surface for a fluid analysis	fluid
fluid surface force	Net force exerted by a fluid on a named surface, \(\mathbf{f}=-\int_{A}\mathbf{t}\,dA\)	fluid
fluid surface pressure	Average fluid pressure on each face of a surface, evaluated from the nodal values of the fluid dilatation on that face	fluid
fluid surface traction power	Net traction power across a named surface of a fluid analysis	fluid
fluid velocity	Element fluid velocity \(\mathbf{v}^{f}\) in fluid and fluid-FSI materials	fluid
fluid volume ratio	Fluid volume ratio \(J\)	fluid
fluid volume ratio gradient	Gradient of porosity in a biphasic-FSI material.	fluid
fluid vorticity	Fluid vorticity	fluid
growth infinitesimal strain	growth infinitesimal strain	solid
growth Lagrange strain	growth Lagrange strain	solid
growth left Hencky	growth left Hencky	solid
growth left stretch	growth left stretch	solid
growth relative volume	growth relative volume	solid
growth right Hencky	growth right Hencky	solid
growth right stretch	growth right stretch	solid
ideal gas pressure	current pressure value of the ideal gas pressure load	solid
incremental displacement	The displacement increment from the previously written plot state.	solid
infinitesimal strain	The average infinitesimal strain tensor in an element	solid
in-situ target stretch	the fiber stretch induced by the initial prestrain gradient	solid
intact bond fraction	fraction of intact bonds in a reactive-viscoelastic material	solid
kinetic energy density	The average kinetic energy density in an element	solid
Lagrange strain	The average Lagrange strain in an element	solid
left Cauchy-Green	The left Cauchy-Green deformation tensor \(\mathbf{b}=\mathbf{F} \mathbf{F}^T\)	solid
left Hencky	Left Hencky strain \(\mathbf{h}=\frac{1}{2}\ln\mathbf{b}\), where \(\mathbf{b}=\mathbf{F}\cdot\mathbf{F}^{T}\)	solid
left stretch	Left stretch tensor \(\mathbf{V}=\mathbf{b}^{1/2}\)	solid
local fluid load support	Local fluid load support on biphasic contact surfaces	biphasic
material axes	"The material axes of an element stored as a \(3 \times 3\) tensor. The columns of the tensor represent the local x-	solid
mesh_data	Stores the value of a mesh_data field to the plotfile. The output class depends on the mesh_data field.	core
micro energy	the integrated strain energy of a micro material	solid
mixture deviatoric strain energy density	Deviatoric strain energy density in mixture components	solid
mixture specific strain energy	Specific strain energy in mixture components	solid
mixture strain energy density	Strain energy density in mixture components	solid
mixture stress	the cauchy stress in a component of a solid mixture.	solid
nodal acceleration	The acceleration at the nodes	solid
nodal contact gap	Contact gap distance, evaluated at contact surface nodes	solid
nodal contact pressure	Contact pressure, evaluated at contact surface nodes	solid
nodal contact traction	Contact traction vectors, evaluated at contact surface nodes	solid
nodal fluid flux	Fluid flux in biphasic, biphasic-solute, triphasic, multiphasic, fluid-FSI and biphasic-FSI materials	fluid
nodal fluid velocity	Fluid velocity \(\mathbf{v}^{f}\) in fluid and fluid-FSI materials	fluid
nodal shell director	The director of a shell node.	solid
nodal strain	the Green-Lagrange strain tensor projected to the nodes.	solid
nodal stress	The Cauchy stress, projected to the nodes.	solid
nodal surface traction	Contact nodal tractions	solid
nodal vector gap	Contact gap vector at surface nodes	solid
nodal velocity	The nodal velocities	solid
octahedral plastic strain	octahedral plastic strain	solid
osmolarity	Element's average osmolarity in biphasic/triphasic/multiphasic analysis	solute
osmotic coefficient	the element-averaged osmotic coefficient in a multiphasic material	multiphasic
parameter	Stores heterogeneous material parameter data	core
partition coefficient	the element-averaged solute partition coefficient in a multiphasic material	solute
permeability	the element-averaged permeability in a biphasic-FSI material	fluid
pid controller	the output value of a PID controller	core
PK1 norm	The norm of the PK1 stress of a micro material	solid
PK1 stress	The PK1 stress of the element.	solid
PK2 stress	The PK2 stress of the element.	solid
plastic yield stress	The current yield stress in a plastic material	solid
plasticity heat supply density	Reactive plasticity heat supply	solid
porosity	the element-averaged porosity in a biphasic or multiphasic material	fluid
pressure gap	Pressure gap between opposing surfaces in a biphasic contact analysis	biphasic
prestrain compatibility	the prestrain compatibility tensor of an elastic-prestrain material	solid
prestrain correction	the 3x3 prestrain correction tensor	solid
prestrain stretch	the stretch induced by the effective prestrain gradient	solid
prestrain stretch error	the error in the prestrain stretch of an elastic-prestrain material	solid
rate of deformation	The average rate of deformation tensor (i.e. symmetric part of velocity gradient) in an element	solid
reaction forces	The nodal reaction forces.	solid
receptor-ligand concentration	Receptor-ligand concentration in a biphasic-solute analysis.	multiphasic
referential fixed charge density	Referential fixed charge density \(c_{r}^{F}\), which may evolve with chemical reactions	solute
referential solid volume fraction	the referential solid volume fraction in a multiphasic material	biphasic
relative fluid velocity	Average element fluid velocity relative to mesh \(\mathbf{w}\) in fluid and fluid-FSI materials	fluid
relative volume	Relative volume \(J=\det\mathbf{F}\)	solid
right Cauchy-Green	The right Cauchy-Green deformation tensor \(\mathbf{C}=\mathbf{F}^T \mathbf{F}\)	solid
right Hencky	Right Hencky strain \(\mathbf{H}=\frac{1}{2}\ln\mathbf{C}\)	solid
right stretch	Right stretch tensor \(\mathbf{U}=\mathbf{C}^{1/2}\)	solid
rigid acceleration	Rigid body center of mass acceleration	solid
rigid angular acceleration	Rigid body angular acceleration	solid
rigid angular momentum	Rigid body angular momentum	solid
rigid angular position	Rigid body rotation pseudo-vector	solid
rigid angular velocity	Rigid body angular velocity	solid
rigid force	Total force applied to the rigid body	solid
rigid kinetic energy	Rigid body kinetic energy	solid
rigid linear momentum	Rigid body linear momentum	solid
rigid position	Rigid body center of mass position	solid
rigid rotation vector	Rigid body rotation pseudo-vector	solid
rigid torque	Rigid body moment	solid
rigid velocity	Rigid body center of mass velocity	solid
rotation	the values of the nodal rotation degrees of freedom stored as a vector	solid
RVE generations	Number of generations in reactive viscoelastic material	solid
RVE recruitment	weak bond recruitment ratio in reactive viscoelastic material point	solid
RVE reforming bonds	Fraction of weak bonds available to break and reform in reactive viscoelastic material	solid
RVE strain	Strain measure used in strain-dependent reactive viscoelastic relaxation and weak bond recruitment	solid
s norm	The norm of the Cauchy stress	solid
sbm areal concentration	SBM areal concentration (mole per shell area) of a shell element	multiphasic
sbm concentration	concentration of a solid-bound molecule in an element	multiphasic
sbm referential apparent density	Average element solid-bound molecule referential apparent density	multiphasic
scalar surface load	surface element averaged load. (assumes the surface has a load applied)	solid
shell bottom nodal strain	Shell Lagrange strain extrapolated to bottom nodes	solid
shell bottom nodal stress	Shell Cauchy stress extrapolated to bottom nodes	solid
shell bottom strain	Average of shell Lagrange strain extrapolated to bottom surface	solid
shell bottom stress	Average of shell Cauchy stress extrapolated to bottom surface	solid
shell director	The shell director	solid
shell displacement	Nodal displacements of the back-nodes of shell elements	solid
shell relative volume	Relative volume of shell element	solid
shell strain	Average strain in shell element	solid
shell thickness	Shell thickness	solid
shell top nodal strain	Shell Lagrange strain extrapolated to top nodes	solid
shell top nodal stress	Shell Cauchy stress extrapolated to top nodes	solid
shell top strain	Average of shell Lagrange strain extrapolated to top surface	solid
shell top stress	Average of shell Cauchy stress extrapolated to top surface	solid
solid stress	Cauchy stress in the solid phase of an FSI material	fluid
solid volume fraction	the element-averaged solid volume fraction in a biphasic-FSI material	fluid
solute concentration	Solute concentration \(c\) in biphasic-solute materials, or \(c^{\alpha}\) in triphasic/multiphasic materials	solute
solute flux	Solute flux \(\mathbf{j}\) in biphasic-solute materials or \(\mathbf{j}^{\alpha}\) in triphasic/multiphasic materials.	solute
solute relative Peclet number	Element relative Peclet number	fluid-solutes
solute volumetric flux	Volumetric flux of solute in triphasic/multiphasic materials	solute
specific strain energy	Average element specific strain energy	biphasic
SPR infinitesimal strain	The infinitesimal strain tensor recovered using SPR	solid
SPR Lagrange strain	The Lagrange strain recovered using SPR	solid
SPR prestrain correction	The 3x3 prestrain correction tensor (recovered with SPR)	solid
SPR principal stress	Principal stress values obtained via SPR projection	solid
SPR relative volume	The relative volume (i.e. det F) recovered using the SPR method	solid
SPR stress	Cauchy stress obtained via SPR projection	solid
SPR-P1 stress	Cauchy stress obtained via SPR projection (first-order projection)	solid
strain energy density	Strain energy density \(\Psi\left(\mathbf{C}\right)\)	solid
stress	Cauchy stress	solid
stress error	the effective stress	solid
strong bond SED	Strain energy density of strong bonds in reactive viscoelastic material	solid
surface area	The area of a surface in the current configuration.	solid
surface reaction force	Total reaction force on a surface	solid
surface reaction moment	Total reaction moment on a surface	solid
surface traction	Nodal surface tractions of nodes on a contact surface	solid
total angular momentum	Total angular momentum of a rigid body domain	solid
total energy	total energy (= strain energy + kinetic energy) of a solid domain.	solid
total linear momentum	Total linear momentum of a rigid body domain	solid
truss stretch	Current stretch of the truss element (i.e. \(\lambda = L_t / L_0\))	solid
uncoupled pressure	The pressure of an uncoupled material	solid
ut4 nodal stress	Stresses at the nodes of the UT4 element	solid
vector gap	The vector gap at nodes of a contact surface	solid
velocity	Nodal velocities (fluid nodal velocities in fluid analyses)	solid
volume fraction	Average element volume fraction of a solid mixture	solid
weak bond SED	Strain energy density of weak bonds in reactive viscoelastic material	solid
yielded bond fraction	The fraction of bonds that have yielded in a reactive viscoelastic material	solid