Element¶

Class for handling element related data.

class qd.cae.dyna.Element¶

Examples

Get elements by

>>> from qd.cae.dyna import *
>>> femfile = D3plot("path/to/d3plot")
>>> element_list = femfile.get_elements()
>>> shells = femfile.get_elements(Element.shell)
>>> id = 1
>>> element = femfile.get_elementByID(Element.solid, id)

Methods

`get_coords`()	Get the elements coordinates (mean of nodes).
`get_energy`()	Get the energy of the element, if it was read with `d3plot.read_states`.
`get_estimated_size`()	Get the average element edge size of the element.
`get_history_variables`()	Get the loaded history variables of the element.
`get_id`()	Get the id of the element.
`get_node_ids`()	Returns
`get_nodes`()	Get the nodes of the element.
`get_part_id`()	Returns
`get_plastic_strain`()	Get the plastic strain of the element, if it was read with `d3plot.read_states`.
`get_strain`()	Get the strain tensor of the element, if it was read with `d3plot.read_states`.
`get_stress`()	Get the stress tensor of the element, if it was read with `d3plot.read_states`.
`get_stress_mises`()	Get the mises stress of the element, if it was read with `d3plot.read_states`.
`get_type`()	Get the type of the element.
`is_rigid`()	Get the status, whether the element is a rigid (flag for shells only).
`type`	Element types:

get_coords()¶

Get the elements coordinates (mean of nodes).

Returns

coordsnp.ndarray: coordinate vector (nTimesteps x 3)

Notes

Returns an empty vector, if the element has no nodes.

Examples

>>> d3plot = D3plot("path/to/d3plot")
>>> element = d3plot.get_elementByIndex(Element.shell, 1)
>>> element.get_coords().shape
(1L, 3L)
>>> # load disp
>>> d3plot.read_states("disp")
>>> element.get_coords().shape
(34L, 3L)

get_energy()¶

Get the energy of the element, if it was read with d3plot.read_states.

Returns

energynp.ndarray: time series of element energy

Examples

>>> element.get_energy().shape
(34L,)

get_estimated_size()¶

Get the average element edge size of the element.

Returns

sizefloat: average element edge size

Examples

>>> element.get_estimated_size()
2.542

get_history_variables()¶

Get the loaded history variables of the element.

Returns

history_varsnp.ndarray: time series of the loaded history variables

Notes

The history variable column index corresponds to the order in which the variables were loaded

Examples

>>> d3plot = D3plot("path/to/d3plot",read_states="history 1 shell max")
>>> d3plot.get_elementByID(Element.shell, 1).get_history_variables().shape
(34L, 1L)

get_id()¶

Get the id of the element.

Returns

idint: id of the element

Examples

>>> d3plot.get_elementByID(Element.shell, 1).get_id()
1

get_node_ids()¶

Returns

node_idslist of int: list of node ids belonging to the element

Examples

>>> d3plot = D3plot("path/to/d3plot")
>>> element = d3plot.get_elementByID(Element.shell, 1)
>>> element.get_node_ids()
[1, 55, 21, 33]

get_nodes()¶

Get the nodes of the element.

Returns

nodeslist(Node): nodes of the element

Examples

>>> elem_nodes = element.get_nodes()

get_part_id()¶

Returns

part_idint: id of the part, to which the element belongs

Examples

>>> d3plot = D3plot("path/to/d3plot")
>>> part = d3plot.get_partByID(1)
>>> element = part.get_elements()[0]
>>> element.get_part_id()
1

get_plastic_strain()¶

Get the plastic strain of the element, if it was read with d3plot.read_states.

Returns

plastic_strainnp.ndarray: time series of plastic strain

Examples

>>> element.get_plastic_strain().shape
(34L,)

get_strain()¶

Get the strain tensor of the element, if it was read with d3plot.read_states. The strain vector contains the matrix components: [e_xx, e_yy, e_zz, e_xy, e_yz, e_xz]

Returns

strainnp.ndarray: time series of the strain tensor data

Examples

>>> element.get_strain().shape
(34L, 6L)

get_stress()¶

Get the stress tensor of the element, if it was read with d3plot.read_states. The stress vector contains the matrix components: [s_xx, s_yy, s_zz, s_xy, s_yz, s_xz]

Returns

stressnp.ndarray: time series of the stress tensor data

Examples

>>> element.get_stress().shape
(34L, 6L)

get_stress_mises()¶

Get the mises stress of the element, if it was read with d3plot.read_states.

Returns

stressnp.ndarray: time series of the mises stress

Examples

>>> element.get_stress_mises().shape
(34L,)

get_type()¶

Get the type of the element.

Returns

element_typeElement.type: Element.beam, Element.shell or Element.solid

Examples

>>> d3plot.get_elementByID(Element.beam, 1).get_type()
type.beam
>>> d3plot.get_elementByID(Element.shell, 1).get_type()
type.shell
>>> d3plot.get_elementByID(Element.solid, 1).get_type()
type.solid
>>> d3plot.get_elementByID(Element.tshell, 1).get_type()
type.tshell

is_rigid()¶

Get the status, whether the element is a rigid (flag for shells only). Rigid shells have no state data!

Returns

is_rigidbool: rigid status of the element

Examples

>>> d3plot = D3plot("path/to/d3plot", read_states="stress_mises max")
>>> elem1 = d3plot.get_elementByID(Element.shell, 451)
>>> elem1.is_rigid()
False
>>> elem1.get_stress_mises().shape
(34L,)
>>> elem2 = d3plot.get_elementByID(Element.shell, 9654)
>>> elem2.is_rigid()
True
>>> elem2.get_stress_mises().shape # rigid shells lack state data
(0L,)

class type¶

Element types:

Element.type.none (only used for filtering)
Element.type.beam
Element.type.shell
Element.type.solid
Element.type.tshell