# zone.field.quantity

Syntax

s := zone.field.quantity
zone.field.quantity = s

Get/set the scalar quantity to retrieve when the value being obtained is a tensor. This value is ignored if the type is not a tensor. The available quantity names are listed in the following table.

Quantity Name Description
intermediate intermediate principal stress
maximum the maximum (most positive) value of principal stress (note that compressive stresses are negative in FLAC3D)
mean the mean pressure value defined as the trace of the tensor divided by 3. For stresses this is most often referred to as the pressure.
minimum the minimum (most negative) principal stress (note that compressive stresses are negative in FLAC3D)
norm The norm of the strain rate; see the equations below
octohedral octahedral stress; see the equations below
shear-maximum maximum shear stress
total-measure distance of tensor value to the origin in principal space
volumetric volumetric change or trace
von-mises Von Mises measure; see the equations below
xx $$xx$$-component of the tensor
xy $$xy$$-component of the tensor
xz $$xz$$-component of the tensor
yy $$yy$$-component of the tensor
yz $$yz$$-component of the tensor
zz $$zz$$-component of the tensor
Returns: s - the name of the scalar quantity to retrieve from the tensor s - the name of the scalar quantity to retrieve from the tensor. Keyword matching rules are used. If no match is found, an error occurs.

Table 2: Equations for Zone Field Quantities
Quantity Name Stress Strain Increment Strain Rate
norm $$\sqrt{\sigma_{kk}}$$ $$\sqrt{{\epsilon^i}_{kk}}$$ $$\sqrt{{\epsilon^r}_{kk}}$$
octohedral $$\sqrt{{2 \over 3} J_2}$$ $$\sqrt{{8 \over 3} J^i_2}$$ $$\sqrt{{8 \over 3} J^r_2}$$
von-mises $$\sqrt{3J_2}$$ $$\sqrt{{4 \over 3} J^i_2}$$ $$\sqrt{{4 \over 3} J^r_2}$$