A Method for Predicting the Remanufacturability of Centrifugal Compressor Impellers Based on GBF Zone Size
A centrifugal compressor and manufacturable technology, applied in measuring devices, machine gear/transmission mechanism testing, instruments, etc., can solve the problems of indeterminate size, difficulty in accurately detecting the size and nature of internal cracks, low measurement accuracy, etc. The effect of accurate and reliable judgment results and reliable remanufacturability judgment results
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[0028] Example 1, such as Figure 1-Figure 3 Shown:
[0029] Step 1: Determine the single-step cyclic load σ l : According to the working condition of centrifugal compressor impeller, combined with Haigh diagram, the equivalent load is calculated as σ ε =580MPa, take σ ι =625MPa, σ ι -σ ε =45MPa, then the subsequent allowable GBF area size is relatively conservative and credible.
[0030] Step 2: Get the single-step equivalent load σ l The number of fatigue fracture cycles of each specimen under action N i: A group of FV520B specimens made of the same material as the centrifugal compressor impeller are subjected to fatigue loading on an ultra-high cycle fatigue testing machine. The fatigue testing machine used in this example is Shimadzu USF-2000 ultrasonic fatigue testing machine, and the resonance frequency is 20KHz. The resonance time is 150ms, the intermittent time is 150ms, and the stress ratio R=-1; the measured stress cycles of the FV520B specimen are 1.94E+07, 2...
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