Influence of welded hollow spherical joints on the mechanical behavior of single-layer reticulated shell structures

2018 ◽  
Vol 40 (8) ◽  
Author(s):  
Zhongwei Zhao ◽  
Haiqing Liu ◽  
Bing Liang
Keyword(s):  
Mechanical Behavior ◽  
Single Layer ◽  
Shell Structures

Method for considering corroded joints in buckling analysis of single-layer reticulated shell structures

2021 ◽  
pp. 1-11
Author(s):  
Zhongwei Zhao ◽  
Tianhe Li ◽  
Yuan Yang ◽  
Zhendong Zhang ◽  
Ni Zhang
Keyword(s):  
Single Layer ◽  
Buckling Analysis ◽  
Shell Structures

Isogeometric analysis of laminated smart shell structures covered with piezoelectric sensors and actuators using degenerated shell formulation

2019 ◽  
Vol 30 (13) ◽  
pp. 1913-1931 ◽  
Author(s):  
Sajjad Nikoei ◽  
Behrooz Hassani
Keyword(s):  
Single Layer ◽  
Laminated Composite ◽  
Piezoelectric Sensor ◽  
Basis Functions ◽  
Shell Structures ◽  
Free Form ◽  
Control Analysis ◽  
Sensors And Actuators ◽  
Spline Basis ◽  
Shell Formulation

An isogeometric approach to the analysis of laminated composite smart shell structures based on the degenerated formulation and Mindlin–Reissner assumptions using non-uniform rational B-spline basis functions is the subject of this article. To model the laminated orthotropic smart free-form shells, the equivalent single layer theory is adopted, and an accurate approach to construct the local basis systems is used. To consider the electric potential in the piezoelectric layers, a sub-layer approach is employed that assumes linear variation over the thickness of the sub-layer. To investigate the performance of the approach, static, free vibration, and static control analysis of laminated composite shells covered with piezoelectric sensor and actuator layers with different degrees of basis functions is performed. Also, the effect of mechanical loading, various input voltages, and different boundary conditions on the static response and natural frequencies have been investigated. Several numerical examples are presented to demonstrate the efficiency and accuracy of the approach and validated with the existing results from the literature.

Advances on the Influence of Joint Stiffness on Mechanical Behavior of Single-Layer Reticulated Shell

2011 ◽  
Vol 94-96 ◽  
pp. 162-168
Author(s):  
Ning Wang ◽  
Su Duo Xue ◽  
Xiong Yan Li
Keyword(s):  
Mechanical Behavior ◽  
Joint Stiffness ◽  
Single Layer ◽  
Work Team ◽  
The Future ◽  
Static Mechanical ◽  
Ball Joints ◽  
Future Work ◽  
Made In

The bolt-ball joints and welded hollow spherical joints are used frequently in the reticulated structures. Many researches on the influence of the bolt-ball joints stiffness on dynamic and static mechanical behavior of these structures are carried out by far. This paper reviews these researches, and points out the limitation as well, then the future work of which has been put forward. In addition, the progress made in our work team in this filed is illustrated.

Elasto-Plastic Bearing Capacity of Four Types of Single-Layer Reticulated Shell Structures Under Fire Hazards

2015 ◽  
Vol 15 (03) ◽  
pp. 1450051
Author(s):  
Yin Bai ◽  
Lu Yang ◽  
Lingfeng Gong
Keyword(s):  
High Temperature ◽  
Bearing Capacity ◽  
Single Layer ◽  
Critical Factor ◽  
Shell Structures ◽  
Nonuniform Temperature ◽  
Fire Hazards ◽  
Ambient Temperatures ◽  
Practical Design ◽  
Fire Conditions

Single-layer reticulated shells are widely used in spatial structures. One critical factor that has to be considered in the design of reticulated shells is the significant adverse impact of high temperature caused by fire on the structures. In order to study the variation of elasto-plastic bearing capacity under high temperature by fire, four types of single-layer reticulated shells (i.e. K6, Geodesic, Schwedler and Lamella) are investigated under two typical fire conditions (i.e. global nonuniform temperature distribution and local high temperature) by the geometrically and materially nonlinear analysis and statistical methods. Practical design formulae for calculating the elasto-plastic bearing capacity of reticulated shell structures under different fire conditions and ambient temperatures are proposed based on the numerical simulation results.

Processing of Ceramic Tapes Into 3-D Shells and its Application to a Small Spherical Stepper Motor

2001 ◽  
Author(s):  
Jun Li ◽  
G. K. Ananthasuresh
Keyword(s):  
Low Temperature ◽  
Cylindrical Shells ◽  
Single Layer ◽  
Processing Technique ◽  
Degree Of Freedom ◽  
Shell Structures ◽  
Stepper Motor ◽  
Active Device ◽  
Three Degree Of Freedom ◽  
Meso Scale

Abstract Low Temperature Co-fired Ceramic (LTCC) tapes (DuPont, 951 series), originally developed for monolithic packaging of interconnects and hybrid microelectronic circuitry, have been used in the last four years to develop a meso-scale integrated fluidic technology. The LTCC fluidic technology is shown to be versatile, inexpensive, fast, and free of packaging problems. The manufacturing basis for this technology is patterning of individual tapes, which are laminated and co-fired to create a layered 3-D structure. In this paper, we present another attractive facet of this technology by creating 3-D shell structures with a single layer of LTCC tape. The processing technique is illustrated with hemispherical and cylindrical shells that have internal 3-D conduits. A novel three degree-of-freedom spherical stepper motor is also presented as an application of an active device using magneto-statically actuated curved LTCC shells.

Study on the Overall Stability of Single-Layer Spherical Latticed Shell Structures and Its Applications in Engineering

2010 ◽  
Vol 163-167 ◽  
pp. 137-142
Author(s):  
Fan Wang ◽  
Zhi Gang Zhang ◽  
Min Luo
Keyword(s):  
Structural Design ◽  
Research Result ◽  
Joint Stiffness ◽  
Single Layer ◽  
Shell Structures ◽  
Joint Structure ◽  
Overall Stability ◽  
Practical Engineering ◽  
Joint Rigidity ◽  
Steel Joints

This paper focuses on the research of stability capacity of shells with openings, the judgment of joint rigidity and the influence of joint rigidity on stability capacity of shell structure. The research result showed that it should give priority to use ribbed-Schwedler shells for the shells with large openings. Currently, there is no clear standard for judging joint rigidity, this paper presents a way to identify the steel joints stiffness. In the structural design of Chang'an stadium, according to the joint structure, it is proved to be hinged node by analyzing the joint stiffness. Buckling analysis results show that: single-layer shell with hinged nodes also has good stability. The result of the research has a certain value to practical engineering design.

Arch-Supported Reticulated Shell Structures and Their Static Mechanical Behaviour

2002 ◽  
Vol 17 (4) ◽  
pp. 263-269 ◽  
Author(s):  
Yuan-Qi Li ◽  
Zu-Yan Shen
Keyword(s):  
Mechanical Behaviour ◽  
Single Layer ◽  
Structural Features ◽  
Shell Structures ◽  
Hybrid Structures ◽  
Structural System ◽  
Imperfection Sensitivity ◽  
Geometrical Imperfection ◽  
Static Mechanical ◽  
Arch Structures

Based on the structural features of reticulated shells, arch structures, etc., arch-supported reticulated shell structures have been developed as a new large-span space structural system. In the paper, the acceptability of this hybrid structural system and the reasonable combination of arch structures and reticulated shells with different Gaussian curvatures are discussed. Several ideas on using arch-supported reticulated shell structures to form openable structures are also mentioned. Compared to single-layer reticulated shells, the mechanical behaviour of the hybrid structures, especially the influence of initial geometrical imperfection, was investigated through nonlinear analysis and experimental research on three typical models. Analysis indicates that hybrid structures can efficiently decrease the geometrical imperfection sensitivity and improve their integral mechanical behaviour, which proves that this type of hybrid structures can be used widely.

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