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| Analysis of Hollow Fan Blade Unexpected Failure in the HCF Test |
| WANG Jiaguang, LI Di, CHEN Yunyong, LIU Xiaofeng, LIAO Lianfang |
| (Design, Research & Development Center, AECC Commerical Aircraft Engine CO., LTD., Shanghai 200241, China) |
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Abstract For the unexpected failure of hollow fan blade in the HCF test, vibration simulation and crack analysis
was done. The results indicated that, the failure region was not the high stress region, and the crack initiates from crossing
area of thin plate and thick plate in the suction side, which was caused by fatigue. The failure mechanism was that thin plate
of local region distorted in the SPF process so that the thick and thin plates fret wore in the high cycle fatigue test, which
induces the fatigue failure. Based on the fatigue analysis, improvement measure was made through both optimizing the
parameters in the SPF process and adding CT inspection in the test process. Validation test showed that the improvement
measure was effective, and the unexpected failure problem was solved successfully.
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2017, 
