Which property is critical for bolts when subjected to dynamic loads?

When bolts are subjected to dynamic loads, the critical property that comes into play is fatigue resistance. Dynamic loads involve fluctuations in stress and can lead to repeated or cyclic loading, which increases the risk of fatigue failure. This type of failure occurs when material experiences stress below its ultimate tensile strength over many cycles, leading to cracks and eventual failure. Therefore, bolts must possess high fatigue resistance to ensure they can endure these cyclic stresses without failing, maintaining their structural integrity over time.

In contrast, while corrosion resistance is important for the longevity of components in certain environments, it does not specifically address the challenges posed by dynamic loads. Flexibility is generally not a desired property of bolts, as they need to maintain rigid connections. Color accuracy is irrelevant to the mechanical performance of bolts under load. Thus, fatigue resistance is the property most crucial for ensuring the reliability and safety of bolted connections in dynamic applications.