Computing the Growth of Small Cracks in the Assist Round Robin Helicopter Challenge
Abstract
:1. Introduction
2. Materials and Methods
3. Crack Growth in 7075-T7351
3.1. Crack Growth under a FALSTAFF Flight Load Spectrum
3.2. Short Cracks in 7075-T7351
4. Computing Crack Growth in the DST Small Crack Helicopter Round Robin Challenge
Short Cracks in 7075-T7351
5. Material Variability
On the Shape of the Crack Depth History Curves
6. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Test | A (MPa √m) | ∆Kthr (MPa √m) |
---|---|---|
G | 111 | 1.3 |
K | 111 | 1.79 |
L | 111 | 1.1 |
N | 111 | 1.1 |
U | 111 | 1.48 |
V | 111 | 1.6 |
X | 111 | 1.45 |
Y | 111 | 1.6 |
G | 111 | 1.3 |
IRF-E15 | IRF-E15 | IRF-E16 | CSL090SS00 | CSL090SS05 | CSL090SS15 | CSL090SS20 |
---|---|---|---|---|---|---|
82,839 | 248,255 | 649,666 | 64,958 | 64,958 | 64,958 | 64,958 |
Measured/Computed | IRF-E15 Load Blocks to Failure | CSL090SS15 Load Blocks to Failure |
---|---|---|
Smallest test life | 38.3 | 32.0 |
Longest test life | 66.1 | 72.7 |
Mean life | 46.8 | 54.5 |
Standard deviation (σ) | 10.4 | 13.6 |
Mean-3σ | 15.6 | 13.8 |
Computed ΔKthr = 0.3 MPa √m, A = 40 MPa √m | 8.9 | 12.7 |
Computed ΔKthr = 0.3 MPa √m, A = 111 MPa √m | 9.7 | 13.2 |
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Jones, R.; Peng, D.; Raman, R.K.S.; Huang, P. Computing the Growth of Small Cracks in the Assist Round Robin Helicopter Challenge. Metals 2020, 10, 944. https://doi.org/10.3390/met10070944
Jones R, Peng D, Raman RKS, Huang P. Computing the Growth of Small Cracks in the Assist Round Robin Helicopter Challenge. Metals. 2020; 10(7):944. https://doi.org/10.3390/met10070944
Chicago/Turabian StyleJones, Rhys, Daren Peng, R.K. Singh Raman, and Pu Huang. 2020. "Computing the Growth of Small Cracks in the Assist Round Robin Helicopter Challenge" Metals 10, no. 7: 944. https://doi.org/10.3390/met10070944