Select elementary indices

This module provides functions to filter elementary data. A layered element has the following number of elementary data points:

num_elementary_data = number_of_layers * number_of_spots * number_of_nodes_per_spot_plane

In the preceding definition, number_of_spots indicates the number of through-the-thickness integration points per layer. number_of_spots is controlled by keyoption 8, which indicates how much output is written. For example, you might write output for only 'bottom' and 'top' or for 'bottom', 'top', and 'mid'.

Each elementary data point can have multiple components. For example, it might have one component for scalar data or six components for symmetrical 3x3 tensors. The elementary data of an element is available as a 2D vector with shape (num_elementary_data, number_of_components).

Here are some examples:

• Get the stress output for a layered shell element (181, four nodes) with five layers and keyoption 8 = 2. Write the output for 'bot', 'top', and 'mid'.

  • number_of_layers = 5

  • number_of_spots = 3 (bottom, top, and middle)

  • number_of_nodes_per_spot_plane = 4 (equal to number of nodes)

  • number_of_components = 6

  Thus, num_elementary_data = number_of_layers * number_of_spots * number_of_nodes_per_spot_plane = 60.

• Get the stress output for a layered solid element (185, eight nodes) with seven layers and keyoption 8 = 1. Write the output for 'bot' and 'top'.

  • number_of_layers = 7

  • number_of_spots = 2 (bottom and top)

  • number_of_nodes_per_spot_plane = 4

  • number_of_components = 6

  Thus, num_elementary_data = number_of_layers * number_of_spots * number_of_nodes_per_spot_plane = 56.

The functions in this module compute an array of elementary indices for a given selection of layers, nodes, spots, DPF material IDs, or analysis plies. These elementary indices can be used to index the first axis of the elementary data array. For usage information, see Filter result data by different criteria.

get_selected_indices(element_info[, layers, ...])	Get elementary indices based on element information, layers, nodes, and spots.
get_selected_indices_by_analysis_ply(...)	Get selected indices by analysis ply.
get_selected_indices_by_dpf_material_ids(...)	Get selected indices by DPF material IDs.