Fatigue strength is important to assure the reliability of contact springs in micro switches or relays for which cyclic motions are required. Fig. 6 shows the fatigue strength of various copper alloys.
Beryllium Copper alloy 25 has higher fatigue strength than any other copper alloy, e.g. 8 times longer durability than phosphor bronze, while alloy 11 and 7 exhibit slightly higher fatigue strength than Phosphor Bronze.
Fig. 6 Fatigue Strength Beryllium Copper vs. Phosphor Bronze
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