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为研究民机复合材料层合板湿热环境下对其强度的影响,采用刚度折减理论,建立应力-应变本构方程,并利用Hoffman强度理论和刚度修正的方法,对复合材料单向板T300/3238A在5种湿热环境下和复合材料层合板CCF300/5228在湿热与干态常温2种环境下,分别进行强度分析。计算了初始层破坏载荷与极限载荷,并与实验数据对比分析,准确地预测此类复合材料层合板的整体失效过程、失效载荷及其在湿热环境作用下的强度影响。本研究利用实验与理论分析相结合的方法研究复合材料的湿热效应,提供一种适用于民机复合材料维修工程的分析方法。
In order to study the influence of the civil aircraft composite laminate on its strength in the hot and humid environment, the stiffness reduction theory was used to establish the stress-strain constitutive equation. The Hoffman strength theory and the stiffness correction method were used to study the mechanical properties of the T300 / 3238A in five kinds of hot and humid environment and the composite laminates CCF300 / 5228 in the wet and dry conditions at room temperature two kinds of environment, respectively, for strength analysis. The failure load and the ultimate load of the initial layer were calculated and compared with the experimental data to accurately predict the overall failure process, failure load and the strength of the composite laminate under the effect of hot and humid environment. In this study, the combination of experimental and theoretical analysis of composite materials to study the effect of damp heat to provide a suitable composite materials for civil aircraft maintenance engineering analysis.