scholarly journals Analytical modelling of spatial deformation pathways in planar and spatial shallow bistable arches

2019 ◽  
Vol 475 (2227) ◽  
pp. 20190164
Author(s):  
Safvan Palathingal ◽  
G. K. Ananthasuresh
Keyword(s):  
Finite Element Analysis ◽  
Torsional Buckling ◽  
Element Analysis ◽  
Spatial Deformation ◽  
Transverse Bending ◽  
Generalized Framework ◽  
Torsion Energy ◽  
Critical Characteristics ◽  
Flexural Torsional Buckling ◽  
Energy Components

We analyse spatial bistable arches and present an analytical model incorporating axial, two transverse bending and torsion energy components. We extend the St. Venant and Michell relationship used in flexural-torsional buckling of planar arches and use it in modelling spatial arches. We study deformation pathways in spatial arches and their effect on critical characteristics of bistability such as back and forth switching forces, and the distance travelled by a point of the arch. We show that not considering spatial deformation leads to incorrect inferences concerning the bistability of planar arches too. Thus, this model serves as a generalized framework for the existing analysis on planar arches since they belong to a subset of spatial arches. Additionally, the effects of eccentric loading on spatial deformations are explored for arches with a range of as-fabricated shapes and boundary conditions, and the results are validated with finite-element analysis.

Study on Calculation Theory of Elastic Flexural-Torsional Buckling Bearing Capacity for Castellated Beams

2015 ◽  
Vol 744-746 ◽  
pp. 1635-1639
Author(s):  
Xiang Rong Chen ◽  
Hai Long Yuan ◽  
Xing Chen ◽  
Zhen Wen Liu
Keyword(s):  
Finite Element Analysis ◽  
Calculation Methods ◽  
Height Ratio ◽  
Torsional Buckling ◽  
Element Analysis ◽  
Buckling Loads ◽  
Buckling Strength ◽  
The Finite Element Analysis ◽  
Flexural Torsional Buckling ◽  
Abaqus Software

The structure of castellated beams is complex, using the computation theory of elastic flexural-torsional buckling of H-shaped beams to study the elastic flexural-torsional buckling strength of castellated beams under different loads, based on simplifying the section's eigenvalues. In addition to the theoretical investigation, the finite element analysis of the accurate critical loads of the beams had been done by the ABAQUS software, a comparison has been made between the calculated loads and analyzed results, error is smaller. Analyzing the effects that divergence ratio, depth-span ratio and distance-height ratio has on the elastic flexural-torsional buckling loads of castellated beams and draw out some reduced calculation methods for the section's eigenvalues and elastic flexural-torsional buckling critical load of castellated beams.

scholarly journals Design and Experimental Investigation of Composite Automotive Drive Shaft

2021 ◽  
Vol 9 (10) ◽  
pp. 1088-1094
Author(s):  
Akshay Dudam
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Composite Materials ◽  
Natural Frequency ◽  
Power Transmission ◽  
Drive Shaft ◽  
Torsional Buckling ◽  
Element Analysis ◽  
High Rotational Speed ◽  
Specific Strength

Abstract: Replacing composite bodies by the conventional metallic bodies have many advantages because of high specific strength and high specific stiffness of the composite materials. As compared to the conventional drive shafts, Composite drive shafts have the potential of lighter and longer life with high rotational speed. Nowadays drive shafts are used in two pieces. However, the main advantage of the current design is that only one piece of composite drive shaft is possible that fulfils all the drive shaft requirements. The torsional strength, torsional buckling and bending natural frequency are the main basic requirements considered here. This work is all about the replacing the conventional two-piece steel drive shaft with a one-piece carbon/epoxy. Design of composite drive shaft Classical Lamination Theory is used for the design of composite drive shaft. Finite element analysis (FEA) was used to design composite drive shafts incorporating carbon within an epoxy matrix. From experimental results, it was found that the developed one-piece automotive composite drive shaft had 64% mass reduction, 74% increase in torque capability compared with a conventional two-piece steel drive shaft. It also had 6380 rpm of natural frequency which was higher than the design specification of 3050 rpm. Index Terms: Bending frequency, Composite Materials, Drive shaft, Finite Element Analysis (FEA), Power transmission, Torsion, Torsional buckling.

scholarly journals Torsional Buckling by Joining Prestrained and Unstrained Elastomeric Strips With Application as Bilinear Elastic Spring

2017 ◽  
Vol 84 (10) ◽  
Author(s):  
Raudel Avila ◽  
Yeguang Xue
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
High Performance ◽  
Three Dimensional ◽  
Torsional Buckling ◽  
Element Analysis ◽  
Lateral Dimension ◽  
Recent Advances ◽  
Force Displacement ◽  
Elastic Spring

Controlled formation of complex three-dimensional (3D) geometries has always attracted wide interest especially in micro/nanoscale where traditional fabrication techniques fail to apply. Recent advances employed buckling as a promising complementary assembling technique and the method can be used for high-performance electronics materials, such as silicon. This paper describes a new buckling pattern generated by joining multiple prestrained and unstrained elastomeric strips. After releasing, periodic twisting of the system along the releasing direction is generated and bilinear force–displacement relationship is revealed from finite element analysis (FEA). The finding enriches the classes of geometries that can be achieved from structural buckling. Also, compared to other buckling phenomena, the lateral dimension of the system does not change during the buckling process, which makes the structure perfect for elastic spring elements that can be arranged closely to each other without interference.

scholarly journals BEHAVIOUR OF PARALLEL GIRDERS STABILISED WITH U‐FRAMES

2010 ◽  
Vol 16 (2) ◽  
pp. 197-202 ◽  
Author(s):  
Kuldeep Virdi ◽  
Walid Azzi
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Buckling Analysis ◽  
Effective Length ◽  
Ultimate Capacity ◽  
Lateral Torsional Buckling ◽  
Torsional Buckling ◽  
Element Analysis ◽  
Key Factor ◽  
The Stability

Lateral torsional buckling is a key factor in the design of steel girders. Stability can be enhanced by cross‐bracing, reducing the effective length and thus increasing the ultimate capacity. U‐frames are an option often used to brace the girders, when designing through type of bridges and where overhead bracing is not practical. This paper investigates the effect of the U‐frame spacing on the stability of the parallel girders. Eigenvalue buckling analysis was undertaken with four different spacings of the U‐frames. Results were extracted from finite element analysis, interpreted and conclusions drawn. Santrauka Projektuojant plienines sijas šoninis sukamasis klupumas yra svarbiausias veiksnys. Pastovumas gali būti padidintas skersiniais ryšiais, mažinančiais veikiamaji ilgi ir padidinančiais ribine galia. U‐formiai remai yra dažna priemone sijoms išramstyti, kai projektuojami tiltai, kuriu laikančiosios konstrukcijos yra virš pakloto, o viršutiniai ryšiai yra nepraktiški. Šiame straipsnyje nagrinejamas U‐formiu remu tarpatramio poveikis lygiagrečiuju siju pastovumui. Tikravertis klupumo skaičiavimas buvo atliktas esant keturiems skirtingiems U‐formiu remu tarpatramiams. Aptarti rezultatai, gauti apskaičiavus baigtinius elementus, padarytos išvados.

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