ADVANCED MATERIALS & PROCESSES | JULY 2026 28 Fatigue testing has evolved from analog dials and paper charts to the high-speed, data-intensive landscape of today. Throughout this journey, one reality has remained constant: Fatigue testing remains one of the most significant challenges for engineers. Whether it is a Ti-6Al-4V alloy for an aerospace turbine, a 3D-printed lattice for a medical implant, or a carbon-steel strut for an EV chassis, fatigue, the progressive structural damage that occurs when a material is subjected to cyclic loading, is responsible for roughly 90% of metallic structural failures in the field. Understanding fatigue is not just a regulatory hurdle; it is a life- safety mandate. TECHNICAL SPOTLIGHT WHY ROTATING BEAM FATIGUE TESTING IS RESHAPING THE INDUSTRY A fundamental shift in how materials are qualified has led to the increased application of rotating beam fatigue testing as a streamlined alternative to axial testing. However, creating a fatigue testing plan is often a complex, costly undertaking. Engineers must balance a staggering number of variables: stress amplitude, mean stress, frequency, surface finish, environmental conditions, and sample fixturing. For decades, the industry defaulted to uniaxial tension-compression fatigue testing as the standard answer. In 2018, ADMET Inc. launched the eXpert 9300 Rotating Beam Fatigue (RBF) system: a faster, more economical alternative designed to generate reliable fatigue data without the infrastructure burden of conventional axial testing. This article examines the inherent friction of conventional axial fatigue testing and discusses why the industry’s pivot toward RBF is not merely a trend, but a fundamental shift in how materials are qualified. CONVENTIONAL FATIGUE TESTING’S HIDDEN COSTS In conventional fatigue testing (commonly following ASTM E466), machines are designed to simulate real-world operating environments as closely as possible. While this fidelity is vital, it slows down the R&D cycle and drives up cost. Actuator Pigeonholing. To run a uniaxial test, a high-end servo- hydraulic or electromechanical frame is used. These systems require dedicated floor space and actuator configurations that are often specifically engineered ADMET’s eXpert 9300 Series rotating beam fatigue testing system.
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