研究目的
To study the machinability of carbon fiber reinforced polymer composite and the effect of various machining parameters on the performance responses like heat affected zone and surface roughness using an erbium-doped fiber laser.
研究成果
1. Response surface morphology was used to observe the influence of laser parameters on surface roughness and HAZ.
2. The empirical mathematical model was developed for better prediction of surface roughness and HAZ.
3. It was noted that with an increase in power and decrease in SOD and scan speed, there was an increment in surface roughness and heat affected zone.
4. The minimum width of HAZ (1.227mm) and surface roughness(1.143μm) were obtained at 300 W laser power with 200 mm/sec scan speed, and 0.8 mm stand-off distance.
5. SEM images showed surface irregularities created on the machined surface during laser machining.
研究不足
The study was limited to the use of an erbium-doped fiber laser for machining CFRP composites. The effects of other types of lasers or machining methods were not explored. Additionally, the study focused on specific ranges of laser power, scan speed, and standoff distance, which may not cover all possible operational conditions.
1：Experimental Design and Method Selection:
Response surface methodology (RSM) was used to study the influence of input parameters on the output responses. The experiments were designed using Minitab 17 Software.
2：Sample Selection and Data Sources:
Composite material was prepared by hand lay-up technique assisted by vacuum bagging process. The fiber volume fraction of arranged material is 55%.
3：5%.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Erbium-doped fiber laser with a maximum power of 400 W, CNC controlled worktable, CO2 gas as assist gas, and cold water from the chiller unit to cool the laser head.
4：Experimental Procedures and Operational Workflow:
The laser power used to cut the CFRP composite laminate varies from 300 W to 360 W with the scan speed ranging between 200 mm/sec to 300 mm/sec. The standoff distance between the workpiece surface and the laser beam nozzle differs from 0.4 mm to 0.8 mm.
5：4 mm to 8 mm.
Data Analysis Methods:
5. Data Analysis Methods: The response can be represented graphically, either in a three-dimensional space as surface plots or as contour plots that help to visualize the shape of the response surface.
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