具有金属内衬缠绕压力容器成型全过程应力场分析

基于具有金属内衬复合材料缠绕容器缠绕、固化和预超压3个制造工艺过程的特点，提出一种温度参数当量法模型和虚实单元分析策略，以模拟在缠绕预张力工艺中的力学行为．根据固化反应动力学理论和热传导理论，对具有金属内衬的复合材料纤维缠绕压力容器在固化工艺过程中瞬态温度、固化度和热应力场分布及其变化规律进行了数值分析．采用经典塑性理论为基础的非线性有限元方法，预测了预超压工艺后容器复合材料缠绕层和金属内衬内残余应力场的分布．以一典型的具有金属内衬复合材料纤维缠绕压力容器为例，讨论了在3个工艺过程中工艺参数对容器内应力场分布的影响．结果表明：适合的工艺参数能够提高压力容器的承载能力．

Numerical analysis of process induced stress field for composite filament wound vessel with metal liner

Based on characteristics of the whole manufacturing process enclosed the winding, cure and autofrettage processes for the composites filament wound vessel with metal liner,a methodology for the prediction of the induced process stress field has been developed. Firstly, a finite element approach combining the temperature parametric method with real fictitious elements scheme was proposed for simulating the winding tension process; secondly, in accordance with the cure kinetic and heat transfer theory, a corresponding finite element method was employed to calculate the distributions of temperature, cure degree and thermal stress fields during the cure process. Finally, a non-linear finite element method on the basis of the classical plastic theory was introduced to analyze the distribution of residual stress field in the filament winding layers and metal liner after the autofrettage process. Numerical examples for a typical high pressure vessel were given for illustrating it. The results show that the vessel loading capcacity can be improved by selecting the appropriate process parameters.