private void OverrideCentroids()
 {
     _x_Bar  = bf / 2;
     _y_Bar  = d / 2;
     _x_pBar = bf / 2;
     _y_pBar = d / 2;
     ElasticCentroidCoordinate = new Mathematics.Point2D(x_Bar, y_Bar);
     PlasticCentroidCoordinate = new Mathematics.Point2D(x_pBar, y_pBar);
 }
        private void OverrideCentroids()
        {
           _x_Bar =bf / 2;
           _y_Bar = d / 2;
           _x_pBar = bf / 2;
           _y_pBar = d / 2;
            ElasticCentroidCoordinate = new Mathematics.Point2D(x_Bar, y_Bar);
            PlasticCentroidCoordinate = new Mathematics.Point2D(x_pBar, y_pBar);

        }