Beryllium copper wire and strip have a history of working in cyclic stress environments for electrical contact springs. Cyclic conditions are present when rotational bending, cantilever bending, and axial loading processes are done. Heavier sections of this alloy are also often used in various components that are subject to cyclic loading. Because of beryllium copper’s high fatigue strength, it is frequently used to create beryllium copper racers and rollers in bearing with rolling elements. It is also used for downhole hardware for oil and gas. Beryllium copper is used for the above applications because it can endure cyclic stress.
Fatigue strength is considered the most substantial amount of stress that can withstand a specific number of cycles without failing. Beryllium copper has high fatigue strength because it resists fatigue failure under several conditions, which includes toughness and high static strength. It also has the ability for diffusing strain through work hardening.
Standard tests of beryllium copper are used to measure fatigue properties of round beams and flat springs. Agreement of testing procedures is generally good, although some spring manufacturers have created testing that suits their own unique design requirements.
Because fatigue performance is dependent upon the service stress state, as well as surface conditions, extreme care should be taken to keep a high surface quality. This is especially the case for fillet radii and edges. Keeping a watchful eye on these surfaces will maximize the advantages given by this alloy.
For more information on beryllium copper wire and its fatigue strength, you should give our team a call. Do not forget to ask about 521 alloys as well.