Kinetics, evolving thermal properties, and surface ignition of carbon fiber reinforced epoxy composite during laser-induced decomposition
Kinetics, evolving thermal properties, and surface ignition of carbon fiber reinforced epoxy composite during laser-induced decomposition
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DOI：
10.1016/j.polymdegradstab.2018.04.007
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发表时间：
2018-06-01
影响因子：
5.9
通讯作者：
Perram, Glen P.
中科院分区：
文献类型：
--
作者：
Herr, Nicholas C.;Gonzales, Ashley E.;Perram, Glen P.
研究了碳纤维增强聚合物(CFRP)复合材料在激光诱导聚合物基质分解过程中的分解动力学、反应热、热导率和发射率的演化以及表面着火条件。用1.07微米、2kW的Yb光纤激光器以5~525W/cm(2)的功率照射不同厚度的机织碳纤维-环氧板。使用中波红外相机测量了前后表面温度的变化，并通过测量辐照和未辐照的CFRP样品的发射率进行了调整。用三维显式有限差分热模型计算了两步环氧分解反应和单步炭氧化反应的Arrhenius动力学参数、反应热和导热系数。动力学不强烈依赖于20-700摄氏度/秒的升温速度，在较低激光功率下确定的参数可以很好地外推到较高功率。表面点火发生在1198+/-50摄氏度的临界表面温度。
The decomposition kinetics, heats of reaction, evolving thermal conductivity and emissivity, and surface ignition conditions of carbon fiber reinforced polymer (CFRP) composites during laser-induced polymer matrix decomposition were investigated. Woven carbon fiber-epoxy panels of different thicknesses were irradiated with a 1.07-mu m, 2-kW ytterbium fiber laser at irradiances of 5-525 W/cm(2). The changing front and backside surface temperatures were measured using a mid-wave infrared camera, adjusted using measured emissivity of irradiated and un-irradiated CFRP samples. The evolving temperature maps were fit to a 3D, explicit, finite difference, thermal model to estimate Arrhenius kinetic rate parameters, heats of reaction, and thermal conductivity during a two-step epoxy decomposition reaction and a single stage char oxidation reaction. The kinetics is not strongly dependent on heating rates of 20-700 degrees C/sec and parameters determined at lower laser powers extrapolate well to higher powers. Surface ignition occurs at critical surface temperatures of 1198 +/- 50 degrees C. Published by Elsevier Ltd.