| 摘要: |
| 受初始几何缺陷等因素影响，薄壁圆柱壳稳定性失效承载能力需要在理论模型分析结果基础上进行折减修正。基于试验的折减修正系数难以考虑结构细微差异，往往取值相对保守。面向不同工艺成型方案、不同规格尺寸的薄壁壳体，分析了实测产品的几何缺陷规律，采用实测几何缺陷高保真建模分析方法，开展了承载能力仿真修正技术研究。在实测性能下，结合各类产品的强度破坏试验，验证了分析方法的准确性；基于仿真分析方法，对不同成型工艺下的同类薄壁壳体开展了几何缺陷引起的折减系数预估；最终明确了不同结构工艺与尺寸规格结构承载折减系数的量化差异。实现了基于高保真分析对薄壁圆柱壳稳定性承载进行“精准定位”修正的目标。 |
| 关键词: 几何缺陷 薄壁结构 仿真分析 修正系数 |
| DOI： |
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| 基金项目:国家自然科学基金（U2141217） |
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| Stability Correction and Application of Thin-Walled Shell Based on High Fidelity Analysis |
| FU Hongfei,XU Weixiu,YANG Fan,WANG Fayao,SHI Yuhong |
| (Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China;Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024, China) |
| Abstract: |
| Influenced by factors such as initial geometric imperfections, the bearing capacity of thin-walled cylindrical shells in terms of stability failure requires reduction and correction based on the analysis results of theoretical models. The reduction correction coefficient obtained from experiments is difficult to consider the subtle differences of the structure and often adopts a relatively conservative value. This paper analyzes the rules of geometric imperfections of measured products for thin-walled shells with different process forming schemes and different specifications and sizes. By applying the high-fidelity modeling and analysis method considering the measured geometric imperfections, research on the simulation correction technology of the bearing capacity is carried out. Under the measured performance, the accuracy of the analysis method is verified in combination with the strength failure tests of various products. Based on the simulation analysis method, the reduction coefficients caused by geometric imperfections for the same type of thin-walled shells under different forming processes are estimated. Ultimately, the quantitative differences of the structural bearing reduction coefficients for different structural processes and size specifications are clarified. The goal of ″precise positioning″ correction of the stability bearing capacity of thin-walled cylindrical shells based on high-fidelity analysis is achieved. |
| Key words: Geometric imperfections Thin-walled structure Simulation analysis Correction factor |