`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 principal stress

the maximum (most positive) value of principal stress (note that compressive stresses are negative in FLAC)

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.

the minimum (most negative) principal stress (note that compressive stresses are negative in FLAC)

The norm of the strain rate; see the equations below

octahedral stress; see the equations below

maximum shear stress

distance of tensor value to the origin in principal space

volumetric change or trace

Von Mises measure; see the equations below

\(xx\)-component of the tensor

\(xy\)-component of the tensor

\(xz\)-component of the tensor

\(yy\)-component of the tensor

\(yz\)-component of the tensor

\(zz\)-component of the tensor

- Returns:
s - the name of the scalar quantity to retrieve from the tensor

- Accepts:
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.

Quantity Name

Stress

Strain Increment

Strain Rate

\(\sqrt{\sigma_{kk}}\)

\(\sqrt{{\epsilon^i}_{kk}}\)

\(\sqrt{{\epsilon^r}_{kk}}\)

\(\sqrt{{2 \over 3} J_2}\)

\(\sqrt{{8 \over 3} J^i_2}\)

\(\sqrt{{8 \over 3} J^r_2}\)

\(\sqrt{3J_2}\)

\(\sqrt{{4 \over 3} J^i_2}\)

\(\sqrt{{4 \over 3} J^r_2}\)

[ZC: please review equations above]

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