Pretightening load design for bolt of closure flange structure under intensive impulse loading
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摘要: 为研究承受强脉冲载荷的端盖法兰结构的螺栓预紧力设计方法，利用实验室霍普金森杆平台，基于液压原理设计了一套实验装置，并结合数值模拟结果，对强脉冲载荷下端盖法兰结构的动态响应进行研究。通过研究发现：由预紧力和脉冲载荷引起的螺栓总拉伸应变随载荷峰值变化的曲线上存在最小极值点，并总结了最小极值点随载荷峰值、载荷脉宽的变化规律，为强脉冲载荷下法兰结构和预紧力设计提供了依据。Abstract: In this article, to figure out an optimal pretightening load selection for a closure flange structure under intense impulsive loading, we designed an experimental system based on the SHPB platform and the hydraulic principle and investigated the dynamic response process of a closure flange structure. The results showed that a minimum extreme point was observed on the curve of the total tensile strain of the bolt under the pretightening and impulsive loading versus the impulse peak. Further more, we obtained the variation pattern of the total tensile strain of the bolt with the change of the impulse peak and decay, which can be used as basis for the structural design and the selection of the bolt preload for a sealing flange under intense impulsive loading.
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Key words:
- impulsive loading /
- flange /
- bolt pretightening load /
- bolt /
- SHPB
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图 9 数值模拟结果与实验数据对比
Figure 9. Comparison of numerical simulation and experimental results
图 10 脉冲载荷下螺栓拉伸应变实验和计算结果
Figure 10. Experimental and numerical simulation results of bolt extension strain under impulsive loading
图 11 螺栓总拉伸应变与载荷峰值、预紧力的关系
Figure 11. Variation of bolt total extension strain with pressure peak and preload
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