Influence of tangential airflows on process of laser ablating carbon-fiber composites

CHEN Min-sun; JIANG Hou-man

doi:10.3788/OPE.20111902.0482

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Influence of tangential airflows on process of laser ablating carbon-fiber composites

Article | 更新时间：2020-08-12

- Influence of tangential airflows on process of laser ablating carbon-fiber composites
- Optics and Precision Engineering Vol. 19, Issue 2, Pages: 482-486(2011)
- 作者机构：
  
  国防科学技术大学光电科学与工程学院,湖南长沙,410073
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20111902.0482
  CLC： TN249
- Received：08 October 2010，
  
  Revised：30 October 2010，
  
  Published Online：22 February 2011，
  
  Published：22 February 2011
- 稿件说明：
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陈敏孙, 江厚满. 切向空气气流对激光烧蚀碳纤维复合材料过程的影响[J]. 光学精密工程, 2011,19(2): 482-486

CHEN Min-sun, JIANG Hou-man. Influence of tangential airflows on process of laser ablating carbon-fiber composites[J]. Editorial Office of Optics and Precision Engineering, 2011,19(2): 482-486
陈敏孙, 江厚满. 切向空气气流对激光烧蚀碳纤维复合材料过程的影响[J]. 光学精密工程, 2011,19(2): 482-486 DOI： 10.3788/OPE.20111902.0482.

CHEN Min-sun, JIANG Hou-man. Influence of tangential airflows on process of laser ablating carbon-fiber composites[J]. Editorial Office of Optics and Precision Engineering, 2011,19(2): 482-486 DOI： 10.3788/OPE.20111902.0482.

摘要

研究了靶材表面存在和不存在切向空气气流时

975 nm连续激光对碳纤维增强树脂基复合材料的辐照效应。两种情况下靶材的动态响应过程明显不同

没有切向气流时

激光辐照1.28 s后

向外喷出的热分解产物在空气中燃烧

出现火焰同时伴有浓烟;有切向气流时

没有观察到带火焰和浓烟的燃烧现象

而是在激光辐照后的瞬间

激光作用区出现灼烧状亮斑

并间歇有少许颗粒向外喷出。分析认为

向外溢出的树脂基热分解产物会抑制氧气向靶材表面扩散

从而对碳纤维具有保护作用;切向气流的加载不仅会破坏热分解产物对碳纤维的保护作用

还会促使氧气到达碳纤维表面

进而导致碳纤维在较低的温度(约850 ℃)发生氧化烧蚀。

Abstract

An experiment of 975 nm continuous wave laser irradiating carbon-fiber reinforced resin composites was studied

while the front surface of a target was with and without tangential airflow loadings. The results show that the dynamic responses are obviously different for two different cases.While the front surface of the target is without tangential airflow loading

the ejected inner pyrolysis products ignite surface combustion which is accompanied by dense smoke and flame after laser irradiation for 1.28 s.While the front surface of the target is with tangential airflow loading

there is not obvious combustion flame

but a burn-like bright spot is in the laser-irradiated zone and a little particles spill into the air intermittently. Analysis indicates that the out overflows of pyrolysis products will inhibit the diffusion of oxygen to the target surface

which has a protective effect on the carbon fiber. The presence of tangential airflow not only undermine the protective effect of pyrolysis products on the carbon fiber

but also promote the diffusion of oxygen to the surface. Therefore

the loading of tangential airflow will result in the carbon fiber suffered from oxidative ablation at the low temperature (850 ℃).

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references

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