加肋锥—环—柱结合壳初始几何缺陷形态分析

Shape analysis of ring-stiffened cone-toroid-cylinder combined shells' initial geometrical imperfection

根据加肋锥—环—柱结合壳加工建造过程,分析其中可能产生初始几何缺陷的环节和关键因素。同时参考现行规范,根据大量环肋薄壳结构的建造经验,分别对肋骨与壳板初始几何缺陷的形态进行分析,并与已建模型存在的初始几何缺陷测量值进行对比,进一步验证建造经验的可靠性。结果表明:锥—环—柱结合壳初始几何缺陷主要因肋骨与壳板的角焊缝及壳板之间的环焊缝产生;具有不同半波数的肋骨初挠度以及壳板凹凸度等为典型的初始几何缺陷形态。所得结果可为后续探寻初始几何缺陷对锥—环—柱结合壳力学性能的影响提供参考。

According to the fabrication and construction process of cone-toroid-cylinders combined withpressure hulls,this paper analyzes the cause and location of initial geometrical imperfection and points out that the welding joint is the major cause behind imperfection. Then,based on the exiting rules and experience of building ring stiffened thin shells,this paper studies the shape imperfection of ribs and shells,which is further validated after a comparison with the measurement result of current existing models. The article also reveals the rib＇s imperfection under various half waves and shell＇s imperfection with convex-concave as typical geometrical imperfection. In brief,this research provides a reference to analyze theeffect of geometric imperfection on cone-toroid-cylinder combined shells.