Source code for trusspy.core.element

# -*- coding: utf-8 -*-
"""
title: TrussPy - Truss Solver for Python
author: Andreas Dutzler
year: 2023
"""

import numpy as np


class Element:
    """Element class.

    Attributes
    ----------
    label : int
        Element ID number
    conn : ndarray
        Array containing Element connectivity : `[Node 1, Node 2]`
    elem_type : int, optional
        Element Type. (default is 1 for truss)
    mat_type : int, optional
        Material Type. (default is 1 for linear-elastic)
    material_properties : array_like, optional
        List with material parameters,
        e.g. [Young's modulus, Thermal expansion coefficient] (default is [])
    geometric_proerties : array_like, optional
        List with geometric parameters,
        e.g. [Section area] (default is [])

    """

    def __init__(
        self,
        label,
        conn,
        elem_type=1,
        mat_type=1,
        material_properties=[np.nan],
        geometric_properties=[np.nan],
        mprop=None,
        gprop=None,
    ):
        """Initialize an instance of the Element class.

        Parameters
        ----------
        label : int
            Element ID number
        conn : array_like
            List of Element connectivity ``[Node 1, Node 2]``.
        elem_type : int, optional
            Element Type (default is 1 for "truss").
        mat_type : int, optional
            Material Type (default is 1 for "linear-elastic").
        material_properties : array_like, optional
            List with material parameters,
            e.g. ``[Young's modulus, Thermal expansion coefficient]`` (default is
            [np.nan]).
        geometric_properties : array_like, optional
            List with geometric parameters,
            e.g. ``[Section area]`` (default is [np.nan]).

        """

        self.label = label
        self.conn = np.array(conn)
        self.elem_type = elem_type
        self.mat_type = mat_type

        if material_properties != [np.nan] and mprop is not None:
            raise TypeError(
                'Wrong Material Properties. Use either "material_properties" or "mprop", not both.'
            )

        if geometric_properties != [np.nan] and gprop is not None:
            raise TypeError(
                'Wrong Geometric Properties. Use either "geometric_properties" or "gprop", not both.'
            )

        if mprop is not None:
            self.material_properties = mprop
        else:
            self.material_properties = material_properties

        if gprop is not None:
            self.geometric_properties = gprop
        else:
            self.geometric_properties = geometric_properties