ALTERNATING STRESS 814-1 SUMMARY I Alternating stress: Stress at a point inside a member is changing periodically with time. This kind of stress is called the alternating stress 1gh-pressure LoW-pressure oil oil Fold iron thread§14–１ SUMMARY 1、Alternating stress：Stress at a point inside a member is changing periodically with time. This kind of stress is called the alternating stress. Fold iron thread PP PP high-pressure oil Low-pressure oil