期刊
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
卷 205, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijpvp.2023.104966
关键词
Flange-bolted joints; Bi-linear axial stiffness properties; Axial-flexural coupling deformations; Bolted T-stub joint; Mechanical model
An accurate understanding of the elastostatic properties for flange-bolted joints is crucial in modeling the nonlinear dynamics. This study investigates the elastostatics of flange and presents a mechanical model based on linear elasticity to understand the bi-linear axial stiffness properties and the influence of bolt preloads on stiffnesses. The analysis shows that the differences in interface contact status and different tensile and compressive stiffnesses induce the bi-linear axial stiffness and coupling deformations, while bolt preloads mainly affect the tensile and bending stiffnesses.
An accurate understanding of the elastostatic properties for flange-bolted joints is crucial in modeling the nonlinear dynamics. In this study, the elastostatics of the flange are investigated through finite element (FE) analysis and experimental test. It is shown that the axial stiffness exhibits bi-linear properties, and the flange appears axial-flexural coupling deformations under bending moments. Then, to understand the bi-linear axial stiffness properties and the influence of bolt preloads on axial and bending stiffnesses, the bolted T-stub joint is chosen as the object of study, and the relevant mechanical model is further presented based on linear elasticity. Meanwhile, the validity of the mechanical model is numerically verified. The analysis indicates that under tension and compression, the essence of the bi-linear axial stiffness is the differences in interface contact status, and the coupling deformations are induced by different tensile and compressive stiffnesses. In addition, both the tensile and bending stiffnesses increase with the increase of bolt preloads, while the effect of preloads on compressive stiffness is insignificant.
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