scholarly journals Digital and automatic design of free-form single-layer grid structures

2022 ◽  
Vol 133 ◽  
pp. 104025
Author(s):  
Zhi Li ◽  
Jun Ye ◽  
Boqing Gao ◽  
Qisheng Wang ◽  
Guan Quan ◽  
...  
Keyword(s):  
Single Layer ◽  
Free Form ◽  
Automatic Design

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.

FREE node for a single layer free-form envelope subjected to bending moment

2016 ◽  
Vol 106 ◽  
pp. 25-35 ◽  
Author(s):  
Jintak Oh ◽  
Young K. Ju ◽  
Kyung-Ju Hwang ◽  
Sang-Dae Kim ◽  
Seung-Hee Lho
Keyword(s):  
Single Layer ◽  
Bending Moment ◽  
Free Form ◽  
Free Node

Imperfection Sensitivity Analysis of Double Domes Free Form Space Structures

2015 ◽  
Vol 15 (04) ◽  
pp. 1450067 ◽  
Author(s):  
Mehdi Abbasi Mousavi ◽  
Karim Abedi ◽  
Mohamadreza Chenaghlou
Keyword(s):  
Finite Element ◽  
Limit Equilibrium ◽  
Single Layer ◽  
Initial Imperfection ◽  
Free Form ◽  
Space Structures ◽  
Equilibrium Path ◽  
Imperfection Sensitivity ◽  
Step Method ◽  
Buckling Modes

This paper investigates the effects of applying different buckling modes obtained by linearized eigenvalue buckling analysis as the initial imperfection for double domes free form space structures. Nonlinear elastic–plastic analysis of rigidly jointed single layer double domes are carried out using the finite element method. Having verified the finite element modeling, several different collapse analyses have been undertaken in order to examine the stability behavior of these structures. By using the approximate-perturbed method, the results of the analyses show that in free form double domes, the lowest buckling modes could not be considered as the effective modes to change the bifurcation equilibrium path into the limit equilibrium one. Therefore, the generalized conformable imperfection mode method has been suggested in the present study in order to apply geometric imperfections in free form double domes. Also, one step method has been suggested in order to eliminate 60% of buckling modes, which are nonsensitive, before applying the approximate-perturbed method.

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