scholarly journals Free-form optimization of shell structures for maximizing elastic buckling load

2014 ◽  
Vol 80 (818) ◽  
pp. DSM0307-DSM0307
Author(s):  
Masatoshi SHIMODA ◽  
Tomoki OKADA
Keyword(s):  
Buckling Load ◽  
Shell Structures ◽  
Free Form ◽  
Elastic Buckling

scholarly journals Free-form optimization of CFRP plate/shell structures in natural vibration problem

2020 ◽  
Vol 86 (891) ◽  
pp. 20-00128-20-00128
Author(s):  
Jin-Xing SHI ◽  
Masatoshi SHIMODA ◽  
Shinobu SAKAI
Keyword(s):  
Natural Vibration ◽  
Shell Structures ◽  
Free Form ◽  
Vibration Problem ◽  
Cfrp Plate

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.

2411 Free-form optimization for linear buckling of shell structures

2013 ◽  
Vol 2013.23 (0) ◽  
pp. _2411-1_-_2411-10_
Author(s):  
Tomoki OKADA ◽  
Masatoshi SHIMODA
Keyword(s):  
Shell Structures ◽  
Free Form ◽  
Linear Buckling

122 Free-form Optimization for shell structures

2010 ◽  
Vol 2010.9 (0) ◽  
pp. _122-1_-_122-6_
Author(s):  
Masatoshi SHIMODA
Keyword(s):  
Shell Structures ◽  
Free Form

Free-form optimization method of frame structures for elastic buckling

2016 ◽  
Vol 82 (841) ◽  
pp. 16-00229-16-00229 ◽  
Author(s):  
Masatoshi SHIMODA ◽  
Ryo YOSHIMOTO
Keyword(s):  
Optimization Method ◽  
Free Form ◽  
Frame Structures ◽  
Elastic Buckling

Elastic Buckling Analysis of Rigidly Jointed Single Layer Reticulated Domes with Random Initial Imperfection

1992 ◽  
Vol 7 (4) ◽  
pp. 265-273 ◽  
Author(s):  
Toshiro Suzuki ◽  
Toshiyuki Ogawa ◽  
Kikuo Ikarashi
Keyword(s):  
Single Layer ◽  
Initial Imperfection ◽  
Random Variable ◽  
Buckling Analysis ◽  
Buckling Load ◽  
Mode Shapes ◽  
Elastic Buckling ◽  
Nonlinear Buckling ◽  
Reticulated Domes ◽  
Nonlinear Buckling Analysis

In the present paper, the effect of imperfection on the elastic buckling load and mode shapes of externally-loaded single layer reticulated domes is investigated. The types of buckling concerned here are the general buckling, the local (dimple) buckling and the buckling of a member. As to the geometric parameter of a dome, the slenderness factor S is adopted which represents the openness and slenderness of the dome. The maximum value of the imperfection is assumed to be the normal random variable. The buckling loads are computed by the linear and the nonlinear buckling analysis using the finite element method. The statistical values are calculated by the three-points estimates method. The main points of interest are the influence of the shape and the extent of an imperfection on the buckling load.

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