研究目的
Investigating the fatigue behaviour of different notch geometries of as-build specimens at room temperature to evaluate the fatigue strength of semi-circular and v-shaped notch geometries and compare the results with those of smooth specimens.
研究成果
The fatigue data show less scatter and steeper trend lines for notched specimens than for unnotched specimens. High values of fatigue notch sensitivity were obtained for notch geometries. The semi-circular specimens showed a notch sensitivity higher than full notch sensitivity, while the v-shaped notch displayed a notch sensitivity below full notch sensitivity. The stress fields of the different geometries have been analyzed both by use of FE and analytical models, with the analytical model able to describe the stress field in the geometries well in the region close to the notch tip.
研究不足
The analytical model was developed for notches in infinite plates, and the effect of two notches interacting with each other is not accounted for. The stress field models may not accurately describe the stress field in double notched specimens.
1：Experimental Design and Method Selection:
The study investigates the fatigue behaviour of different notch geometries of as-build specimens at room temperature using analytical models and finite element analysis.
2：Sample Selection and Data Sources:
AM Inconel 718 produced by SLM without any post processing was used. Three different test specimens were considered: one unnotched geometry and two double notched geometries (blunt v-shaped notch and semi-circular shaped notch).
3：List of Experimental Equipment and Materials:
MTS Landmark Servohydraulic Test System for fatigue testing, Abaqus CAE for finite element analysis.
4：Experimental Procedures and Operational Workflow:
Fatigue tests were conducted with load controlled sinusoidal loading, loading ratio R = σmin/ σmax = 0 and frequency of 10 Hz. Specimens that did not fail at 2 × 106 cycles were considered as runout.
5：Data Analysis Methods:
The stress fields were analyzed using analytical models and numerically by finite element. The fatigue data was normalized with the ultimate tensile strength and compared.
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