Computation precision is based on high- quality grid. Solid propellant grain structure is most complex and brings a difficult problem on finite element discreteness. Therefore, rapid modeling technology should be studied. Because solid propellant grain structure was cyclic- symmetry,substructure could be divided up into combinations which made up of many single topology geometries by CAE software. Besides , any geometry could be easily realize operations such as tension, mapping and sweeping, then a-chieved high- quality structure grid. Aiming at a typical star- shaped grain, the paper introduced rapid modeling technology in detail and simulated stress and strain fields during cooldown experiment. The presented rapid modeling technology offers valuable reference for other solid propellant grain structures.%高质量的有限元网格是保证计算精度的前提和基础.固体装药结构型面极其复杂,这给有限元的离散带来了很大的困难,为此需要开展快速建模技术研究.快速建模思想是针对固体装药结构具有循环对称的特点,基于CAE软件,对于其中子结构将其分割成具有单一几何拓扑型式的组合体,方便地实现拉伸、映射或者扫掠操作,获得精度较高的结构化网格.针对某一典型星形内孔固体装药结构,详细阐述了快速建模的核心技术,数值模拟了固化降温过程中固体装药结构的应力应变场特征.快速建模技术对于其他类似的固体装药结构有限元离散具有很好的借鉴和参考价值.
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