纤维缠绕复合材料起伏区域残余应力

针对纤维交叉起伏区域残余应力,建立一种细观分析模型。基于热传导方程、固化反应动力学模型和复合材料层合理论,采用有限元方法和细观分析模型,对缠绕复合材料在固化工艺过程中的残余应力分布及其变化规律进行数值模拟。通过算例,研究纤维起伏区域残余应力的分布特点,结果表明:起伏纤维束不同位置处残余应力差别很大,层合区纤维束呈现拉应力状态,起伏区纤维束呈现压应力状态,富树脂区出现最大压应力;残余应力沿纤维束起伏方向呈现V型变化趋势,在纤维束上不同位置出现拉、压不同的应力状态,起伏角度最大处出现最大压应力。

Residual Stresses in Local Fiber Undulations for Filament-wound Composites

Aimed at the fiber crossover and undulation,a meso-scale model was proposed to analyze the residual stress in the undulation regions of filament-wound composites.The process induced resid-ual stress fields of filament-wound composites during curing process was numerically simulated by commerce software.Based on transit heat conductive equation,curing kinetics model and composite laminated stress analysis theories,the corresponding formulas of the finite element analysis were in-troduced.The time's course and variation scope of residual stress during curing process were fully in-vestigated through the example analysis.The results show that there is great difference of residual stress in different positions of fiber bundle.In laminated zone,the fiber bundle is under tensile stress state,while in fiber undulation zone,that is under compressive stress state,and the maximum residu-al stress appears in resin rich zone.The residual stress shows V-shaped trend along undulation direc-tion,and it appears tensile or compressive stress state in different position of fiber bundle.The maxi-mum compressive residual stress appears in the fiber maximize undulation angle.