Elasto-plastic stability of single-layer reticulated shells

Fan, Feng; Cao, Zhenggang; Shen, Shihui

doi:10.1016/j.tws.2010.04.004

Cited by 91 publications

(24 citation statements)

References 8 publications

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“…For the intermediate design found in Step 65, the nonlinear collapse analysis was carried out including different initial geometric imperfections of amplitude 0 (i.e., perfect structure), L/1000, L/500, L/300, L/200, and L/100, respectively. The sign of the imperfection was consistent with the first buckling mode, which was most unfavorable for the stability of reticulated shells (this approach is known as the consistent imperfection mode method, please refer to Shen and Chen (1999) and Fan et al (2010)). For this purpose, a finite element model including material and geometric nonlinearity was developed in AN-SYS, modeling rods as Timoshenko's beam elements.…”

Section: Features Of the Proposed Methodsmentioning

confidence: 74%

Node shift method for stiffness-based optimization of single-layer reticulated shells

Cui

Jiang

Wang

2014

J. Zheijang Univ.-Sci.

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This paper presents a node shift method to find the optimal distribution of nodes in single-layer reticulated shells. The optimization process searches for the minimum strain energy configuration and this leads to reduced sensitivity in initial imperfections. Strain energy sensitivity numbers are derived for free shift and restricted shift where nodes can move freely in the 3D space or have to move within a predefined surface respectively. Numerical examples demonstrate the efficiency of the proposed approach. It was found that optimized structures achieve higher ultimate load and are less sensitive to imperfections than the initial structure. The configuration of the final structure is closely related to factors like the initial structural configuration, spatial conditions, etc. Based on different initial conditions, architects can be provided with diverse reasonable structures. Furthermore, by amending the defined shapes and nodal distributions, it is possible to improve the mechanical behavior of the structures.

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Section: Features Of the Proposed Methodsmentioning

confidence: 74%

Node shift method for stiffness-based optimization of single-layer reticulated shells

Cui

Jiang

Wang

2014

J. Zheijang Univ.-Sci.

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“…A CAD model of the reticulated shell structure inspired from the diving bell was built accordingly (Figure b). In the reticulated shell structure, the angle between intersecting rods was set as 60 degrees and the height‐to‐span ratio of the reticulated shell structure was 1/5, based on the previous literature . The strut diameters ( ϕ ) applied in this work were 0.75, 1.00, 1.25, and 1.50 mm, and structures with these strut diameters were coded as D 0.75 , D 1.00 , D 1.25 , and D 1.50 , respectively.…”

Section: Methodsmentioning

confidence: 99%

Compressive Properties of Bio‐Inspired Reticulated Shell Structures Processed by Selective Laser Melting

Wang

Lin

et al. 2019

Adv Eng Mater

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Owing to reasonable stress, large rigidity and large span, the reticulated shell structure is widely used in the field of aerospace industry. However, its hardto-process nature hinders, the progress of design optimization, and experimental investigation. In this paper, a series of reticulated shell structure, inspired from the diving bell of the water spiders, is designed and fabricated by selective laser melting (SLM) additive manufacturing technology from AlSi10Mg powder. The effects of strut diameter on dimensional accuracy, densification behavior, and mechanical properties of SLM-processed reticulated shell structures are investigated. The results show that all the SLMprocessed reticulated shell structures exhibit high relative density (>99%), which decrease with the increase of strut diameter. The load-displacement curves of all reticulated shell structures exhibit a similar trend including three distinct stages. The structure with strut diameter of 1.25 mm (D 1.25 ) has relatively high specific energy absorption, and energy absorption capability. The fracture mechanism of SLM-processed reticulated shell structures with different strut diameters is analyzed through a combination of finite element simulations and experimental observations. With an increasing strut diameter, the dominant mechanism changes from stress-controlled to porositycontrolled fracture.

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“…The influence of the material nonlinearity on the statbility of single-layer lattice shell or gird shell structures is significant [23]. Moreover, the model containing only geometry nonlinearity will over estimate the failure load of the structure.…”

Section: Stability Behaviormentioning

confidence: 99%

Nonlinear Stability Analysis of a Radially Retractable Suspen-Dome

Liu¹,

Feng²,

Tu³

2017

Volume 13 Number 2

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A radially retractable roof structure based on the concept of the suspen-dome is proposed in this paper. The radially foldable bar structure are strengthened by the lower cable-strut system. Then the buckling capacity of a radially retractable suspen-dome was investigated. The geometrically non-linear elastic buckling and elasto-plastic buckling analyses of the hybrid structure were carried out. Then the effects of different structural parameters, such as the rise-span ratio, beam section, area and pre-stress of lower cable-strut systems, on the failure load were investigated. The influence of imperfections on the elasto-plastic buckling loads was also discussed. The results show that the critical buckling load is reduced by taking account of material non-linearity. Furthermore, increasing the rise-to-span ratio or the cross-section area of steel beams notably improves the stability performance of the structure. However, the area and pre-stress of cable-strut systems pose small effect on the structural stability. It can also be found that the suspen-dome is highly imperfection sensitive and the reduction of the failure load due to imperfections is considerable.

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Elasto-plastic stability of single-layer reticulated shells

Cited by 91 publications

References 8 publications

Node shift method for stiffness-based optimization of single-layer reticulated shells

Node shift method for stiffness-based optimization of single-layer reticulated shells

Compressive Properties of Bio‐Inspired Reticulated Shell Structures Processed by Selective Laser Melting

Nonlinear Stability Analysis of a Radially Retractable Suspen-Dome

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