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cracks-2004

by James Steiner (Submitted: 03/05/2004 )

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(You can also run this model in your browser, but we don't recommend it; details here.)

WHAT IS IT?

This model simulates the effect of randomly punching holes in a sheet of material to experimentally determine how many hole-punches can occur before the material fails. For this simulation "failure" is defined as the emergence of a continuous flaw between opposite edges.

Flaws are colored as follows:
Blue: Connected to the bottom
Red: Connected to the right
Dk Green: Connected to the left
Lt Green: Connected to the top
(Flaws connected to adjacent edges are a blend of the two colors)
Ligher color: flaws created because all surrounding material was removed. In other words, a drop-out.

When the material fails, the failure areas will be colored differently than the other flaws.

HOW TO USE IT

Use the 'flaw-size' slider to select the size of the punched holes. Size 0 is a single patch. Click setup, then go.

Void-removal is the process of finding bits of material that are unconnected to any edge, and removing those bits. Removing voids gives a more accurate measure of the amount of matierial removed. However, it is a time-intensive process. To speed up the model, you can turn off void-removal.

THINGS TO TRY AND NOTICE

Run the model with different flaw sizes.
How does flaw size affect the number of flaws before failure?
How does flaw size appear to affect the % flawed at failure?

EXTENDING THE MODEL

This model uses "circular" flaws. Extend the model to create flaws in the form of lines, or other shapes.

COPYRIGHT & LICENSE
This work is Copyright 2004 James P. Steiner.
This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/1.0/ or send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.

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