Abstract
Fatigue tests were conducted on standard smooth laser metal deposition (LMD) Ti-6.5Al-2Zr-1Mo-1V titanium alloy specimens under three constant-amplitude stresses. The mixed failure behaviors and the influence of internal pores on the fatigue life were discussed in detail. The double-peak characteristics of the fatigue life distribution have been observed, and a bimodal lognormal distribution (BLG) with five variables can be used to describe the fatigue life variation. A parameter estimation method based on the maximum likelihood estimation (MLE) method was proposed to estimate the BLG distribution parameters, and the Newton-Raphson algorithm was used to solve the nonlinear equations derived from the likelihood functions. A P-S-N curve description of LMD titanium alloy was established based on the BLG and verified by fatigue life data obtained from a fatigue test.
| Original language | English |
|---|---|
| Article number | 418 |
| Journal | Materials |
| Volume | 12 |
| Issue number | 3 |
| DOIs | |
| State | Published - 30 Jan 2019 |
Keywords
- Bimodal lognormal distribution
- Fatigue life distribution
- Laser metal deposition
- Maximum likelihood estimation
- P-S-N curve
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