Rotating beam fatigue testing, also known as rotating bending fatigue testing, is a method that generates fatigue curves at a higher frequency than traditional axial high cycle fatigue (HCF) methods. Over the past few decades, rotating beam fatigue testing has generated a wealth of fatigue data for metals and coatings.

Test results from rotating beam and axial fatigue can differ significantly especially in materials like gray iron which have a Young’s modulus in tension that does not match the Young’s modulus in compression. Rotating beam fatigue is also used to test the properties of surface treatments or coatings because the surface of the test specimen is under higher stress than the rest of the sample. Before testing, a rotating beam fatigue specimen must be machined and polished, or notched, into a standard sized beam. It is then loaded into the test machine, and rotated around its long axis. Depending on the goal of the project, testing is either run to a set number of cycles, or to failure. 

Element’s rotating beam fatigue labs generally perform testing per ISO 1143 and ASTM F1160; however, we can accommodate a variety of other methods, as well as custom projects. Our experts can assist in every stage of the process, from machining and polishing samples to interpreting test results. With years of fatigue testing experience, we can assist with any project, no matter how complex. 

 

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