Structural Optimization of Thin-Walled Tubular Structures for Progressive Buckling Using Compliant Mechanism Approach

2013 ◽  
Vol 6 (1) ◽  
pp. 109-120 ◽  
Author(s):  
Satyajeet Shinde ◽  
Punit Bandi ◽  
Duane Detwiler ◽  
Andres Tovar
Keyword(s):  
Structural Optimization ◽  
Compliant Mechanism ◽  
Tubular Structures ◽  
Thin Walled

scholarly journals Design of progressively folding thin-walled tubular components using compliant mechanism synthesis

2015 ◽  
Vol 95 ◽  
pp. 208-220 ◽  
Author(s):  
Punit Bandi ◽  
Duane Detwiler ◽  
James P. Schmiedeler ◽  
Andrés Tovar
Keyword(s):  
Compliant Mechanism ◽  
Mechanism Synthesis ◽  
Thin Walled ◽  
Tubular Components

Overview and Kinetostatic Characterization of Compliant Shell Mechanism Building Blocks

2020 ◽  
Vol 12 (6) ◽  
Author(s):  
Joep P. A. Nijssen ◽  
Giuseppe Radaelli ◽  
Charles J. Kim ◽  
Just L. Herder
Keyword(s):  
Mechanism Design ◽  
Compliant Mechanism ◽  
Building Blocks ◽  
Concept Design ◽  
Spatial Mechanism ◽  
Thin Walled Structures ◽  
Spatial Geometry ◽  
Thin Walled ◽  
Compliant Mechanism Design

Abstract Compliant shell mechanisms utilize thin-walled structures to achieve motion and force generation. Shell mechanisms, because of their thin-walled nature and spatial geometry, are building blocks for spatial mechanism applications. In spatial compliant mechanism design, the ratio of compliance is the representation of the kinetostatics involved. Using shell mechanisms in concept design, however, can prove difficult without a uniform characterization method. In this article, we make use of compliance ellipsoids to achieve characterization of the ratio of compliance for shell mechanisms. Ten promising shells are presented with the kinetostatic characteristics, combined with a uniform method of determining the kinetostatic characteristics for other unknown shells. Finally, we show how shells are indeed a valid alternative in the spatial mechanism design, compared to conventional flexure mechanisms.

scholarly journals Structural Optimization Method for the Transition Section in Composite Bucket Foundations of Offshore Wind Turbines

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3230 ◽  
Author(s):  
Puyang Zhang ◽  
Yunlong Xu ◽  
Conghuan Le ◽  
Hongyan Ding ◽  
Yaohua Guo
Keyword(s):  
Structural Optimization ◽  
Hybrid Genetic Algorithm ◽  
Optimization Method ◽  
The Body ◽  
Offshore Wind ◽  
Utilization Rate ◽  
Force Transmission ◽  
Transition Section ◽  
Finite Element Software ◽  
Thin Walled

A two-step structural optimization method was proposed to select the transition section of a composite bucket foundation (CBF). In the first step, based on the variable density method, a solid isotropic microstructures with penalization (SIMP) interpolation model was established under specific load conditions and boundary conditions. The solution of force transmission path and the topology of the transition section in six forms (e.g., linear, arc-shaped, linear thin-walled, and arc-shaped thin-walled) were optimized. Afterwards, finite element software ABAQUS was used to verify this model. Results show that the utilization rate of the arc-shaped thin-walled structure was the largest, and its basic transmission force was more straightforward together with smaller cross-section size at the same height and smaller influence on spoiler flow. In the second step, the detailed optimization of CBF was carried out using mathematical programming. Under the premise of minimum total construction cost, the body shape parameters of each part were set as design variables satisfying the corresponding strength, stiffness, and stability conditions; meanwhile, the minimum total structure weight was set as the objective function. MATLAB was used to solve the sequence quadratic programming (SQP) algorithm and hybrid genetic algorithm, and the optimal body parameters were obtained.

Crashing Behaviour Analysis of TWB Tubular Structures with Different Cross-Sections

2013 ◽  
Vol 814 ◽  
pp. 159-164
Author(s):  
Vlad Andrei Ciubotariu
Keyword(s):  
Finite Element ◽  
Cross Sections ◽  
Fuel Efficiency ◽  
Tubular Structures ◽  
Tailor Welded Blanks ◽  
Thin Walled Structures ◽  
Prediction And Control ◽  
Thin Walled ◽  
Crushing Behavior ◽  
Bimetallic Structures

The present paper investigates the crashing behavior and energy absorption characteristics of thin-walled (tubular) structures with different cross-sections made from tailor welded blanks (TWB) which were subject of axial quasistatic loadings. Resulted data were obtained by using explicit nonlinear finite element code LS_Dyna V971. Implementing the TWB into the auto industry was an efficient method to decrease the general weight of different structures. By far, these kind of bimetallic structures are largely utilized in auto and naval industries because it led to important decrease of scarp quantities and general manufacturing costs, improved material use and probably the most important, great fuel efficiency. After reviewing the literature it was concluded that proper combination between mechanical characteristics of sheet metals, different thicknesses and cross-section shapes into the same thin-walled structure is far too little researched and understood. The aims of this study are better understandings of the crashing behavior regarding thin-walled structure with various cross-sections made from TWB blanks subject to quasistatic loadings. The non-linear finite element platform LS_Dyna V971 was used for the numerical analysis of the crushing behavior regarding the thin-walled structures. Having two materials constituting the thin-walled structures, the crashing behavior changed during the quasistatic loading. Thus, the crashing inertia of the structure is somehow limited and controlled. It is noted that material ratio should not be randomly chosen due to the unexpected crashing mode which could aggravate the prediction and control of the crashing behavior of the thin-walled structure.

Structural optimization of thin-walled tubular trusses using a virtual strain energy density approach

2006 ◽  
Vol 44 (2) ◽  
pp. 235-246 ◽  
Author(s):  
Panagiotis A. Makris ◽  
Christopher G. Provatidis ◽  
Demetrios T. Venetsanos
Keyword(s):  
Energy Density ◽  
Structural Optimization ◽  
Strain Energy Density ◽  
Strain Energy ◽  
Thin Walled ◽  
Virtual Strain Energy Density

A Structural Optimization Method for Universal Design of Compliant Mechanism Scissors

2009 ◽  
Author(s):  
Kazuhiro Izui ◽  
Kiyoshi Yokota ◽  
Takayuki Yamada ◽  
Shinji Nishiwaki ◽  
Masataka Yoshimura
Keyword(s):  
Structural Optimization ◽  
Universal Design ◽  
Compliant Mechanism ◽  
Design Method ◽  
Optimization Technique ◽  
Optimization Method ◽  
Design Criterion ◽  
Design Solution ◽  
Design Criteria ◽  
Level Set Function

This paper proposes a structural optimization-based method for the design of compliant mechanism scissors in which the proposed design criteria are based on universal design principles. The first design criterion is the distance from the hand-grip to the center of gravity of the scissors, which should be minimized to reduce the physical effort required of the people using the device. The second design criterion is that of failure tolerance, where the effects of traction applied in undesirable directions upon the performance of the compliant mechanism should be minimized. Based on the proposed design criteria, a multiobjective optimization problem for the universal design of a compliant mechanism scissors is formulated. Furthermore, to obtain an optimal configuration, a new type of topology optimization technique using the level set function to represent structural boundaries is employed. This optimization technique enables rapid verification of resulting design configurations since the boundary shapes of the obtained design solution candidates can be easily converted to finite element models which are then used in large deformation analyses. Finally, the proposed design method is applied to design examples. The optimal configurations obtained by the proposed method provide good universal design performance, indicating the effectiveness and usefulness of the proposed method.

scholarly journals Adaptive mesh generation procedures for thin-walled tubular structures

2010 ◽  
Vol 46 (1-2) ◽  
pp. 114-131 ◽  
Author(s):  
C.K. Lee ◽  
S.P. Chiew ◽  
S.T. Lie ◽  
T.B.N. Nguyen
Keyword(s):  
Mesh Generation ◽  
Adaptive Mesh ◽  
Tubular Structures ◽  
Adaptive Mesh Generation ◽  
Thin Walled
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