纤维缠绕复合材料结构可靠性评估方法及其应用

为了更加科学有效地评估纤维缠绕复合材料结构的可靠性,根据复合材料渐进失效特点,应用结构系统可靠性理论和方法,将复合材料视为连续体的结构系统,基于复合材料有限元模型对"单元"和"系统"进行了定义,构建了概率渐进失效分析的基本流程,提出了主要失效序列和结构整体的失效概率的精确解算式和近似计算方法.为解决复杂结构系统主要失效...

Reliability Evaluation Method and Its Application for Fiber Wound Composite Structures

In order to evaluate reliability of filament wound composite structure more scientifically and effectively, according to the characteristics of progressive failure of composite materials, with the application of structural system reliability theory, the composite materials are regarded as a continuum structure system, by defining based on the finite element model of composite materials. The basic process of progressive failure probability analysis is constructed and the methods of main failure sequence search and approximate calculation for the whole structure failure probability are put forward. To solve the problem that the identification of major failure sequences in complex structural systems is time-consuming or even impossible, some technical methods, such as fast branching-bound method, critical group (component) failure, the weakest chain model and deterministic preliminary screening for branch points etc., are proposed. Taking solid rocket motor filament wound case as typical application object, firstly progressive failure analysis method is used to filament wound case finite element analysis and experimental verification, and then based on validated model of the finite element , the method proposed in this paper is applied to analyze probabilistic progressive failure process and calculate the overall structural failure probability, the result is consistent with the assumptions of the established method, the scientific nature and effectiveness of this method have been verified.