Aggregate packing generator with fibers used for the simulation of aggregate and fibers in composites. It can be used especially for meso-scale analysis of fiber-reinforced concrete. The algorithm takes into account fibers diameter for ovelap checking with particles and other fibers. Example files are provided for the simulation of aggregate in notched beam "Example_Beam.m" ,cylinder "Example_Cylinder.m", and cube "Example_Cube.m".
Generates aggregates according to Fuller's curve.
Plots generated sieve curve.
Generates aggregate with ellipsoids shapes
Converts ellipsoids to ellipses. used for 2D analysis
7-function [Nodes_Fibers, Fibers]=Generate_Fiber(x,y,z,L,N,DFiber,Orientation,Ndiv,Ellipsoids)
Plot ellipsoids with fibers
where the variables defined as:
x,y,z: as vectors defining the specimen dimension. x and z are vectors defining a polygon section in xz plane and y=[ymin ymax] is boundaries of the extrusion of the polygon
Classes_diameters: Particles classes diameters vector (descendingly)
Alpha: Fuller's curve exponent [0.45-0.5].
m: Particles shape distribution factor. m=1 for spheres and m>>1 for elongated ellipsoid shapes.
Particle_ratio: Particles ratio of the total volume including the smaller particles not simulated in the analysis. ranges [0.6-0.9] for portland cement concrete and about 0.9 for asphalt concrete.
er: Spacing factor between particles to avoid contact [0.05-0.1].
dist: Cutting distance for converting ellipsoids to ellipses.
r_min: Minimum ellipse radius involved when ellipsoids are converted to ellipses.
L: Length of fibers
N: Number of fibers
DFiber: Diameter of fibers
Orientation: can be either:-
-For aligned fibers Orientation=[l m n] where l,m, and n are the direction cosines of the fibers orientation in x,y, and z directions, respectively.
- For random fibers Orientation= (empty)
Ndiv: Number of fiber mesh divisions
Classes: A variable containing generated particles and not yet packed into specimen
Ellipsoids: (N*9) array. each column represent:
(:,1): radius of ellipsoids at direction 1
(:,2): radius of ellipsoids at direction 2
(:,3): radius of ellipsoids at direction 3
(:,4): x-cooridante of centroid
(:,5): y-coordinate of centroid
(:,6): z-coordinate of centroid
(:,7): Inclination angle 1
(:,8): Inclination angle 2
(:,9): Inclination angle 3
Ellipses: (N*5) array. each column represent:
(:,1): radius of ellipses at direction 1
(:,2): radius of ellipses at direction 2
(:,3): x-cooridante of centroid
(:,4): y-coordinate of centroid
(:,5): Inclination angle
Nodes_Fibers: ((Ndiv+1)*N,3) matrix of fibers nodes coordinates.
Fibers: (N,2) matrix of the two nodes indices connecting each fiber segment.
 Unger, Jörg F., and Stefan Eckardt. "Multiscale modeling of concrete." Archives of Computational Methods in Engineering18.3 (2011): 341.
 Fang, Qin, and Jinhua Zhang. "Three-dimensional modelling of steel fiber reinforced concrete material under intense dynamic loading." Construction and Building Materials 44 (2013): 118-132.
 Islam, Mohammad, Gregory J. Tudryn, and Catalin R. Picu. "Microstructure modeling of random composites with cylindrical inclusions having high volume fraction and broad aspect ratio distribution." Computational Materials Science 125 (2016): 309-318.