Rotating Beam Fatigue Testing System

Rotating Beam Fatigue Testing System


Description
● Theory of Operation
Advance Instrument’s rotating beam fatigue testing system (RRM) design is based on the rotating beam principle. The specimen functions as a simple beam symmetrically loaded at two points. When rotated one half revolution, the stresses in the fibers originally below the neutral axis are reversed from tension to compression and vice versa. Upon completing the revolution, the stresses are again reversed so that during one revolution the test specimen passes through a complete cycle of flexural stress (tension and compression).
● Specimen Loading
The AI RRM can be equipped to test simple straight shank specimens. The standard specimen length is 78mm. The specimen shape can be rod or tube. Specimens approximately 25mm (1 in) longer or 25mm (1 in) shorter can be used without affecting the calibration of the machine. Straight shank specimens are held in place using precision specimen collets. Stress is applied to the specimen by direct application of deadweights to ensure precise loading. Maximum fiber stress in a specimen having a 4.3 mm diameter is 3200 MPa. While minimum fiber stress in a specimen having a 11 mm diameter is 20 MPa. The system is equipped with a 7" LCD controller that provides easy-to-use in determination of the load weights needed to produce a particular stress at a simple calculation.
● Load Frame Features
The standard machine operates at an adjustable integrated variable servo speed of 10 RPM to 6,000 RPM.
Speed control is important in testing certain alloys that heat up when highly stressed, and it also allows certain correlations of results between high-speed tests and previous lower speed tests. If speed stability is at ± 0.2% of set point assuming a constant line voltage. At the nominal rate of 6,000 RPM, the machine can complete 360,000 cycles per hour; 8,640,000 cycles per day.
● 7" LCD HMI Controller
An easy-to-read digital cycle counter with pickup device provides an accurate display of completed cycles in display increments of one cycle per count up to 99,999,999 counts. Control buttons are provided to reset the display count at the start of a test. The display is equipped with a memory back up so that count data is not lost in the event of a power loss. Setting the test stress, specimen diameter and type (Rod / Tube) on controller, will automatically calculate out how many load weights is needed. The test can be unlimited cycle or limited cycle,
and it can also show how long the test duration have passed.
Features
Advance Instrument Inc. (AI), recognized as a pioneer in the field of material testing Instrumentation and system developer and manufacturer in Taiwan, has been serving industry faithfully for more than two decades.
Over that time, AI has demonstrated an unsurpassed quality of machine design and performance.Today, the use of the aluminum alloys as machine frame and heavy-duty bearing housings are key components making a system built to last for many years of usage.

Applications:
● Fatigue Test
● Fatigue Limit Test
● Fatigue Fracture Test
● Endurance Limit Test
● Machine Test and Laboratory
● Perform Testing ISO 1143 and ASTM F1160
● Test the Properties of Surface Treatments or Coatings
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