含脱层纤维增强复合材料层合板在湿热环境下的屈曲分析

BUCKLING ANALYSIS OF FIBER-REINFORCED LAMINATED COMPOSITE PLATE WITH DELAMINATION UNDER HYGROTHERMAL ENVIRONMENTS

依据复合材料细观力学研究了含脱层的正交各向异性复合材料层合板的力学性能与温度和湿度的关系,在宏-细观力学模型框架下建立了考虑湿热效应的屈曲控制方程,利用空间上分离变量的方法求解了控制方程,得到满足连续性条件和边界条件的控制方程的解。通过含脱层的复合材料层合板的屈曲数值算例,综合讨论了几何参数、材料参数和湿热环境等多方面的参数变化对含脱层的正交对称铺设复合材料层合板的临界屈曲载荷的影响。

Hygrothermal influences on the mechanical properties of the fiber-reinforced, symmetrical cross-ply composite laminates with a through-width delamination are analyzed from the point view of micro-mechanics of composite materials. Governing equations for the buckling of the delaminated laminate subjected to the in-plane loading under the hygrothermal environments are educed using the macro-micro analytical approach. Using separation of variables in space, the governing equations are solved and the analytical results are obtained by satisfying the continuity and equilibrium conditions at the delamination fronts. Numerical calculations are performed to comprehensively discuss the influences of the geometric parameters, the material properties, the temperature, and the degree of moisture concentration on the buckling performances of the symmetric cross-plied laminates.