Numerical Modeling of a Thin-Walled Profile with respect to the Redistribution of Bending Moments

2015 ◽  
Author(s):  
J. Flodr ◽  
M. Krejsa ◽  
D. Mikolasek ◽  
J. Brozovsky ◽  
P. Parenica
Keyword(s):  
Numerical Modeling ◽  
Bending Moments ◽  
Thin Walled

Stresses in Curved, Circular Thin-Wall Tubes

1963 ◽  
Vol 30 (1) ◽  
pp. 134-135
Author(s):  
E. A. Utecht
Keyword(s):  
Thin Wall ◽  
Bending Moments ◽  
Circular Tubes ◽  
Out Of Plane ◽  
Thin Walled ◽  
Plane Bending

Curves are presented which give stress intensification factors for curved, thin-walled circular tubes under various combinations of in-plane and out-of-plane bending moments.

A characteristic type of instability in the large deflexions of elastic plates III. Curved rectangular plates in axial compression

1954 ◽  
Vol 222 (1148) ◽  
pp. 44-59 ◽  
Keyword(s):  
Axial Compression ◽  
Rectangular Plates ◽  
Bending Moments ◽  
Elastic Plates ◽  
Characteristic Type ◽  
Circular Tubes ◽  
Axis Parallel ◽  
Post Buckling ◽  
Thin Walled ◽  
The Stability

The analysis of part I is extended to deal with the case of free-edged rectangular plates having an initial curvature about an axis parallel to one pair of opposite edges and loaded by distributed bending moments applied to the straight edges and compressive forces applied to the curved edges. In particular, the stability and post-buckling behaviour of such plates subjected to the compressive forces alone is studied. The axially symmetrical buckling of thin-walled circular tubes in axial compression is also considered. Experimental plates are found to buckle at loads rather lower than those predicted.

The Influence of Imperfections and Nonlinearities on the Failure and B2 Stress Index of Thin-Walled Pipes

2015 ◽  
Vol 137 (6) ◽  
Author(s):  
Henry Schau ◽  
Lilit Mkrtchyan ◽  
Michael Geier
Keyword(s):  
Finite Element ◽  
Yield Stress ◽  
Plastic Material ◽  
Limit Load ◽  
Stress Index ◽  
Bending Moments ◽  
Plastic Buckling ◽  
Initial Imperfections ◽  
Thin Walled ◽  
Elastic Plastic Material

The effects of imperfections and nonlinearities on the failure mode and the B2 stress index of thin-walled straight pipes are investigated with finite element (FE) analyses. The analyses were performed for pipes made of an ideal elastic–plastic material and the austenitic steel X6CrNiNb18-10. The B2 index is calculated from the instability bending moments obtained by limit load analyses. The effects of initial imperfections as well as the D/t-ratio and the yield stress on the B2 stress index are studied. As a first result, it is noted that thin-walled straight pipes and imperfections fail due to local plastic buckling. Further analyses show that the type of imperfections, the ovality, the D/t-ratio, and the yield stress have significant influences on the B2 index. The obtained B2 indices for thin-walled straight pipes with D/t > 40 and possible technical imperfections are considerably higher than 1.0. The results have been compared with those of other investigations.

scholarly journals Silo with a Corrugated Sheet Wall

2013 ◽  
Vol 21 (3) ◽  
pp. 19-30 ◽  
Author(s):  
Csaba Németh ◽  
Ján Brodniansky
Keyword(s):  
Computational Models ◽  
Bending Moment ◽  
Physical Models ◽  
Experimental Measurements ◽  
Bending Moments ◽  
Bulk Materials ◽  
Production And Consumption ◽  
Thin Walled ◽  
The Mathematical Model

Abstract Silos and tanks are currently being used to create reserves of stored materials. Their importance is based on balancing the production and consumption of bulk materials to establish an adequate reserve throughout the year. The case study introduced within the framework of this paper focuses on thin-walled silos made of corrugated sheets and on an approach for designing these types of structures. The storage of bulk materials causes compression or tensile stresses in the walls of a silo structure. The effect of a frictional force in the silo walls creates an additional bending moment in a wave, which ultimately affects the resulting bending moments. Several mathematical and physical models were used in order to examine various types of loading and their effects on a structure. Subsequently, the accuracy of the computational models was verified by experimental measurements on a grain silo in Bojničky, Slovakia. A comparison of the experimental and mathematical models shows a reasonable match and confirms the load specifications, while indicating that the mathematical model was correct.

Variational Equation of Motion for Coupled Flexure and Torsion of Bars of Thin-Walled Open Section Including Thermal Effect

1971 ◽  
Vol 38 (2) ◽  
pp. 502-506 ◽  
Author(s):  
Yi-Yuan Yu
Keyword(s):  
Thermal Effect ◽  
Structural Dynamics ◽  
Variational Equation ◽  
Equation Of Motion ◽  
Bending Moments ◽  
Open Section ◽  
Thermal Bending ◽  
Axis Of Symmetry ◽  
Thin Walled ◽  
Special Case

Literature on flexure and torsion of bars of thin-walled open section is reviewed. The use of the variational equation of motion in solving problems of structural dynamics is further advocated. The variational equation of motion, together with the associated stress-displacement relations, is then derived for coupled flexure and torsion of the open section. Thermal effect is included, leading to a thermal twisting moment in addition to the usual thermal bending moments. For the special case of an open section with one axis of symmetry and with symmetrical heat input, only flexure is shown to be thermally inducible. The general result then reduces to the simple variational equation of flexural motion used in a separate study of the thermal flutter of a spacecraft boom.

scholarly journals Composite Absorber in Collision Simulations of a Bus

2017 ◽  
Vol 15 (1) ◽  
pp. 1-5
Author(s):  
Vít Sháněl ◽  
Miroslav Španiel
Keyword(s):  
Numerical Modeling ◽  
Energy Absorption ◽  
Frontal Collision ◽  
Bus Structure ◽  
Thin Walled ◽  
The Impact

Abstract This paper details the numerical modeling of composite absorbers and an assessment of the influence of such deformation elements on a bus during frontal collision with a car. The absorber itself is designed as an assembly of thin-walled composite wound tubes oriented in the vehicle direction of travel. During the impact the tubes are crushed, causing energy absorption. Crash simulations were performed at various speeds using differing scenarios with the deformational member as well as without it. Comparative diagrams of force and velocity of the car and deformation of the bus structure were assessed

Numerical modeling on thin-walled cold-formed steel clip angles subjected to pull-out failures

2021 ◽  
Vol 164 ◽  
pp. 107716
Author(s):  
Marzieh Obeydi ◽  
Maryam Daei ◽  
Mehran Zeynalian ◽  
Mehran Abbasi
Keyword(s):  
Numerical Modeling ◽  
Pull Out ◽  
Cold Formed Steel ◽  
Thin Walled
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