MySources/beam.hpp

#ifndef BEAM_HPP
#define BEAM_HPP
#include <assert.h>
#include <cmath>
#include <iostream>
#include <string>

struct RectangularBeamDimensions {
  inline static std::string name{"Rectangular"};
  double b;
  double h;

  double A{0}; // cross sectional area

  struct MomentsOfInertia
  {
      double I2{0}; // second moment of inertia
      double I3{0}; // third moment of inertia
      double J{0};  // torsional constant (polar moment of inertia)
  } inertia;

  RectangularBeamDimensions(const double &width, const double &height) : b(width), h(height)
  {
      assert(width > 0 && height > 0);
      updateProperties();
  }
  RectangularBeamDimensions() : b(0.002), h(0.002) { updateProperties(); }
  std::string toString() const {
    return std::string("b=") + std::to_string(b) + std::string(" h=") +
           std::to_string(h);
  }

  void updateProperties()
  {
      A = b * h;
      inertia.I2 = b * std::pow(h, 3) / 12;
      inertia.I3 = h * std::pow(b, 3) / 12;
      inertia.J = inertia.I2 + inertia.I3;
  }
  static void computeMomentsOfInertia(const RectangularBeamDimensions &dimensions,
                                      MomentsOfInertia &inertia);
};

struct CylindricalBeamDimensions {
  inline static std::string name{"Cylindrical"};
  double od; // Cylinder outside diameter
  double
      id; // Cylinder inside diameter
          // https://www.engineeringtoolbox.com/area-moment-inertia-d_1328.html
  CylindricalBeamDimensions(const double &outsideDiameter,
                            const double &insideDiameter)
      : od(outsideDiameter), id(insideDiameter) {
    assert(outsideDiameter > 0 && insideDiameter > 0 &&
           outsideDiameter > insideDiameter);
  }
  CylindricalBeamDimensions() : od(0.03), id(0.026) {}
};

struct ElementMaterial
{
    double poissonsRatio;
    double youngsModulus;
    double G;
    ElementMaterial(const double &poissonsRatio, const double &youngsModulus)
        : poissonsRatio(poissonsRatio), youngsModulus(youngsModulus)
    {
        assert(poissonsRatio <= 0.5 && poissonsRatio >= -1);
        updateProperties();
    }
    ElementMaterial() : poissonsRatio(0.3), youngsModulus(200 * 1e9) { updateProperties(); }
    std::string toString() const
    {
        return std::string("Material:") + std::string("\nPoisson's ratio=")
               + std::to_string(poissonsRatio) + std::string("\nYoung's Modulus(GPa)=")
               + std::to_string(youngsModulus / 1e9);
    }
    void updateProperties() { G = youngsModulus / (2 * (1 + poissonsRatio)); }
};

#endif // BEAM_HPP