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Numerical Method for Predicting Permeability of Laminated Composites at Cryogenic Temperature
AIAA Journal ( IF 2.5 ) Pub Date : 2021-03-04 , DOI: 10.2514/1.j060193
Mingqing Yuan 1 , Haitao Zhao 1 , Yahui Peng 1 , Li Tian 1 , Yongtao Yao 2 , Ji’an Chen 1
Affiliation  

The numerical method for predicting the permeability of a laminated composite based on matrix cracks is improved to meet the application at a cryogenic temperature. The number of the parameters that depends on experiments is reduced in this numerical method to save costs. The semianalytical damaged constitutive model of cracked plies, the crack density estimation method, the crack opening displacement estimation, and the effective leakage conductance calculation are improved by involving the temperature or thermal strain. Stiffness degradation of a carbon fiber reinforced plastic lamina with different thicknesses and temperatures is obtained by the proposed constitutive model to validate the effect of temperature; and the degradation of the transverse modulus is found to subside with the increasing temperature when the crack densities are the same. The effective leakage conductance of cross-ply laminates, under biaxial loading, is estimated at cryogenic and room temperatures by using three different average methods. The estimation results agree well with the available experiments in the specimens with a uniform thickness of cracked plies. The simulation results indicate that the easier occurrence of leakage at the cryogenic temperature is owing to the significant degradation of the stiffness at cryogenic temperature instead of the thermal strains.



中文翻译:

低温下层状复合材料渗透率预测的数值方法

改进了基于基体裂纹的预测复合材料渗透率的数值方法,以满足在低温下的应用。在这种数值方法中减少了取决于实验的参数数量,以节省成本。通过涉及温度或热应变,改进了裂纹层的半解析损伤本构模型,裂纹密度估计方法,裂纹开口位移估计以及有效的泄漏电导计算。通过本构模型验证了温度的影响,得到了不同厚度和温度的碳纤维增强塑料薄板的刚度退化。当裂纹密度相同时,横向模量的降低随着温度的升高而减弱。通过使用三种不同的平均方法,在低温和室温下,估计了双轴层压板在双轴加载下的有效漏电导率。估计结果与裂纹层厚度均匀的标本中的可用实验吻合得很好。仿真结果表明,在低温下更容易发生泄漏是由于在低温下而不是热应变下刚度的显着降低。

更新日期:2021-03-05
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