论文部分内容阅读
层合式柔性复合材料其强度、耐候性、密封性突出,在航空航天领域具有重要的应用价值。研究采用激光辐照的方法产生局域外热流,针对不同热流密度和氧气分压,对耐候层和高强度纤维层合材料的烧蚀特性进行了实验研究。实验结果表明,在局域外热源条件下,表面耐候层以热缩合破裂的形式与底层纤维脱开,从而使纤维材料暴露在外热源下,最终以纤维的受热分解和碳化实现材料的整体破坏。随着热流密度的增加,破坏过程明显加快,环境氛围对纤维的高温段烧蚀过程影响很大,而对耐候层的烧蚀过程几乎不产生影响。
Laminated flexible composite materials, its strength, weather resistance, sealing outstanding, in the aerospace field has an important application value. The method of laser irradiation was used to generate the external heat flow. The ablation characteristics of the weathering layer and high-strength fiber laminates were studied for different heat flux and partial pressure of oxygen. The experimental results show that under the condition of external heat source, the surface weathering layer is separated from the underlying fiber in the form of thermal condensation and rupture, so that the fiber material is exposed to the external heat source and finally the material is destroyed by the thermal decomposition and carbonization of the fiber. With the increase of heat flux density, the damage process is obviously accelerated, and the ambient atmosphere has a great influence on the ablation process of fiber in high temperature, but has little influence on the ablation process of weathering layer.