研究目的
Understanding the fundamental aspects of the laser-bone interaction in three-dimensional laser machining of the bone through an integrated experimental-computational approach.
研究成果
Three-dimensional machining of the bone using multi-laser passes with an optimum fill spacing of 0.2 mm and laser fluences ranging from 5:31 J/mm2 to 25:86 J/mm2 resulted in high machining rates in the range of 16:49 + 0:2 mm3/s to 45:53 + 0:56 mm3/s. The increasing exposure of laser to the carbonized region with decreasing fill spacing is expected to be the prime reason for increasing machining rate in addition to increased melt expulsion due to increased recoil pressure at high steady peak temperature.
研究不足
The technical and application constraints of the experiments include the rapid nature and confinement of the process in a very small volume of the material at any given time renders the process untenable for any in situ observations and evaluations. Additionally, the optical and thermophysical properties of the bone are not readily available in the open literature.
1：Experimental Design and Method Selection:
A continuous wave Yb-fiber Nd:YAG laser (λ = 1064 nm) was employed with laser fluences ranging from 5:31 J/mm2 to 25:46 J/mm2 generated in combination of laser power (400 W–700 W) and machining speed (50 mm/s–250 mm/s).
2：Sample Selection and Data Sources:
Fresh bovine femur sections were used for experimental purposes.
3：List of Experimental Equipment and Materials:
A Yb fiber coupled Nd:YAG laser (λ = 1064 nm) with 50 μm core diameter and
4：2 mm mrad beam parameter product (M2 =
5) was employed in this study.
5：Experimental Procedures and Operational Workflow:
The bone specimen was exposed to the laser power (E) in the range of 400–700 W with the laser speed (V) varying from 50 to 250 mm/s. For larger surface coverage, the bone sample was exposed to unidirectional multitrack laser beam treatment.
6：Data Analysis Methods:
The physical morphologies of the laser machined cavity in top and cross-sectional views were observed in the Environmental Scanning Electron Microscope (ESEM) by FEI.
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