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<p>A <b>crack growth equation</b> is used for calculating the size of a <a href="page.php?w=fatigue_%28material%29">fatigue</a> crack growing from cyclic loads. The growth of a fatigue crack can result in catastrophic failure, particularly in the case of aircraft. When many growing fatigue cracks interact with one another it is known as <a href="page.php?w=widespread_fatigue_damage">widespread fatigue damage</a>. A crack growth equation can be used to ensure safety, both in the design phase and during operation, by predicting the size of cracks.</p><p>
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