基于多尺度方法的复合材料加筋板极限强度分析

Ultimate strength analysis of composite stiffened panels based on multi-scale approach

[目的]复合材料内部结构形式多样,深入分析组分材料的损伤机理可为复合材料加筋板的极限强度研究提供基础。[方法]首先,采用多尺度方法,对船用玻璃纤维增强塑料(GFRP)复合材料加筋板进行微观、细观和宏观的力学分析,建立短切毡(CSM)、机织粗纱(WR)材料的微观和细观代表性体积单元(RVE)模型;然后,通过微观和细观RVE模型均匀化,获得宏观等效刚度,并采用ABAQUS软件的子程序VUMAT编写复合材料渐进损伤演化模型,分别得到微观和细观模型的损伤演化机理及宏观单层板等效强度。[结果]结果显示,采用多尺度方法可以很好地评估得到复合材料的宏观力学性能;复合材料加筋板的宏观极限强度主要由纤维束的失效决定。[结论]经多尺度分析得到的宏观材料参数可以用于该材料铺层加筋板的极限强度计算,复合材料的细观力学参数化研究可为材料加工工艺影响研究提供分析手段。

[Objectives]As composite materials have varied internal structures,an in-depth analysis of the damage mechanisms of their component materials can provide a research foundation for the ultimate strength analysis of composite stiffened panels.[Methods]The microscopic,mesoscopic and macroscopic mechanical analyses of marine glass fiber reinforced plastic(GFRP)composite stiffened panels are carried out using a multi-scale approach.Microscopic and mesoscopic representative volume element(RVE)models of chopped strand mat(CSM)and woven roving(WR)materials are established,and the macroscopic equivalent stiffness is obtained by homogenizing the RVE models.The ABAQUS VUMAT subroutine is used to code the progressive damage evolution model of the composite materials to derive the damage evolution mechanism of the microscopic and mesoscopic models respectively.The equivalent strength of macroscopic laminates is also obtained.[Results]The multi-scale approach can be used to accurately evaluate the macroscopic mechanical properties of composite materials,and the ultimate strength of composite stiffened panels is mainly determined by fiber bundle failure.[Conclusions]The obtained macroscopic material parameters can be used to calculate the ultimate strength of composite stiffened panels,while the parametric study of the mesomechanics of composite materials can provide an analysis tool for investigating the influence of material processing technology.