spring_element.hpp

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#pragma once
 
#include <array>
#include <cmath>
 
namespace kynema {
 
struct SpringElement {
    size_t ID;                       // Element identifier
    std::array<size_t, 2> node_ids;  // 2 node IDs (start and end points of spring)
    double stiffness;                // Spring stiffness coefficient
    double undeformed_length;        // Reference/undeformed length of spring
 
    SpringElement(size_t id, std::array<size_t, 2> n_ids, double k, double l0)
        : ID(id), node_ids(n_ids), stiffness(k), undeformed_length(l0) {}
};
 
}  // namespace kynema