研究目的
Investigating the effects of machining parameters on the thermal-affected zone (HAZ) of carbon fiber reinforced plastic (CFRP) using fiber laser.
研究成果
The pulsed laser can restrain the HAZ more than the CW laser does, but causes swelling of the carbon fiber tip. The HAZ decreases with increasing scan speed, even when the number of scans is increased. Nitrogen is the most effective gas in restraining the HAZ and swelling of the carbon fiber.
研究不足
The study focused on the HAZ on the laser irradiated surface only, not the reverse side. The specific items of composite material (fiber direction and number of layers) were not fully considered in the simulation due to complexity.
1：Experimental Design and Method Selection:
The study involved cutting CFRP using continuous wave (CW) and pulsed lasers to examine their effects on the HAZ. The HAZ was measured using an optical microscope, and the carbon fiber tip was observed by scanning electron microscopy (SEM).
2：Sample Selection and Data Sources:
Two kinds of unidirectional CFRP with different thickness, made using the hand-lay-up method, were used.
3：List of Experimental Equipment and Materials:
CW and pulsed fiber lasers, optical microscope (HIROX H-7700), SEM (JSM -T330A).
4：Experimental Procedures and Operational Workflow:
Machining was conducted with varying scan speeds and number of scans, maintaining the total amount of input energy constant. Different assist gases (nitrogen, argon, oxygen) were tested.
5：Data Analysis Methods:
The dimension of the HAZ was measured, and the carbon fiber tip was observed to assess the effects of different machining parameters and assist gases.
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