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RFLM--Advanced Statistical Analysis in HCF

High Cycle Fatigue (HCF) analysis of metallic materials has been practiced since the mid-20th century, using simple statistical methods that, despite known weaknesses, are still common today. The newer Random Fatigue Limit Model (RFLM) addresses issues with traditional assumptions by providing a failure-free load level as a model parameter. 

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Resonance Fatigue Testing--Shaken Not


Stirred

Resonance testing machines are one of the most commonly used systems for fatigue testing of material coupons and components. Other from what some people might expect, resonance testing does not mean that the specimen is forced into its resonance frequency. In reality the whole system--typically a 2-mass oscillating system--consisting of the specimen, its fixture and the machine are excited into resonance.

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Speed Matters--Or Does It?

Due to the fact that resonance fatigue testing machines are capable of very high-test frequencies of up to 1100Hz (typically 50 – 200 Hz for component testing) the question might arise whether the test frequency affects the material fatigue performance. If working faster makes you feel exhausted, why should it be different for the samples you are testing?

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