High-Frequency Alternating Stress Fatigue Testing System for Pressure Vessels

In applications subjected to cyclic stresses, the safety and failure life of metallic or other material components under operating conditions depend on the number of stress cycles. According to the S‑N curves for different materials, a component’s fatigue life is governed by the pressure differential and the number of load cycles experienced in a given service environment: higher pressure differentials result in shorter fatigue lives. Therefore, for products operating under fatigue‑dominated conditions, a scientifically sound approach is to conduct fatigue testing under the actual service‑condition cyclic loading. Such tests provide the basis for predicting service life and enable the establishment of an appropriate service life cycle for the product.

Schwerll employs high-speed data acquisition technology and an alternating‑stress, hydraulically controlled power source to design and construct a realistic sampling‑and‑loading test system, enabling high‑frequency fatigue testing cycles. This significantly shortens the overall test duration while reducing electrical energy consumption and labor costs. Example parameters for a metallic‑product testing system: