How to generate code in MATLAB for randomly oriented short fibers?

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RAJESH 2023-2-27

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https://ww2.mathworks.cn/matlabcentral/answers/1919590-how-to-generate-code-in-matlab-for-randomly-oriented-short-fibers

编辑： RAJESH 2023-3-21

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Jan 2023-2-27

Please add any details: 2D or 3D? Do the "fibers" have a specific shape? Is there an outer limit?

RAJESH 2023-2-27

I want to generate RVE code for short fibre for random oorientations

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Answer 1

Meet 2023-3-6

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https://ww2.mathworks.cn/matlabcentral/answers/1919590-how-to-generate-code-in-matlab-for-randomly-oriented-short-fibers#answer_1186150

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Hi,

Generating code in MATLAB for randomly oriented short fibers typically involves defining the geometry of the fibers and randomly assigning their orientation.

Here's one approach to generate randomly oriented short fibers in MATLAB:

1.Define the length and diameter of the fibers:

fiber_length = 10; % length of the fibers (in microns)
fiber_diameter = 1; % diameter of the fibers (in microns)

2.Generate a random number of fibers:

num_fibers = randi([10, 100], 1); % generate a random integer between 10 and 100 

3.Generate random positions for the fibers within a square region:

region_size = 100; % size of the square region (in microns)
fiber_positions = rand(num_fibers, 2) * region_size; % generate random positions within the region

4.Generate random orientations for the fibers:

fiber_orientations = rand(num_fibers, 1) * pi; % generate random angles between 0 and pi

5.Generate the coordinates of the fiber endpoints:

fiber_endpoints = [fiber_positions, fiber_positions + fiber_length * [cos(fiber_orientations), sin(fiber_orientations)]];

6.Generate a plot of the fibers:

figure;
hold on;
for i = 1:num_fibers
    plot(fiber_endpoints(i, [1, 3]), fiber_endpoints(i, [2, 4]), 'k-', 'LineWidth', fiber_diameter);
end
axis equal;
axis([0, region_size, 0, region_size]);

This code will generate a plot of randomly oriented fibers with random positions and a random number of fibers. You can adjust the parameters (such as the size of the region or the range of the random number of fibers) to suit your needs.

For generating random fibers inside a box, please refer Generate Fiber - File Exchange - MATLAB Central (mathworks.com)

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RAJESH 2023-3-21

编辑：RAJESH 2023-3-21

its fine but my doubt is that, those fibre should be collapase with each other, all should have random position and random direction with approximate 40 to 60 % volume fraction.

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