In gear design, which feature is crucial for increasing durability in high-stress applications?

In gear design, the feature crucial for increasing durability in high-stress applications is material hardness. When gears are subjected to high loads and stresses, the material's hardness plays a significant role in its resistance to wear, deformation, and fatigue. Harder materials can withstand higher stress levels without yielding or losing their geometric integrity, which is essential for maintaining performance over time.

In applications where gears are likely to experience heavy loads and frequent operation, using materials with high hardness ensures that the gear remains functional and reliable, reducing the need for frequent maintenance or replacement. Higher hardness also contributes to better resistance against surface fatigue, pitting, and abrasive wear, which can ultimately extend the lifespan of the gear system under demanding conditions. This makes material hardness a vital factor in the design of durable gears used in high-stress environments.