Generation of Shakedown Boundaries of Thin-Walled 90-Degree Scheduled Pipe Bends Determined via Large and Small Displacement Finite Element Models

2021 ◽  
Author(s):  
Hany Fayek Abdalla
Keyword(s):  
Finite Element ◽  
Finite Element Modelling ◽  
Large Displacement ◽  
Plastic Work ◽  
Small Displacement ◽  
Finite Element Models ◽  
Element Modelling ◽  
Fe Simulations ◽  
Thin Walled ◽  
Shakedown Limit

Abstract The present research investigates the effect of employing large displacement in finite element modelling on the generated shakedown (SD) boundaries of thin-walled 90-degree scheduled pipe bends. A recently developed methodology termed: Shakedown Limit - Plastic Work Dissipation (SDLimit-PWD) method generates the SD boundaries via employing the large displacement in the FE simulations. Additionally, a well-established direct non-cyclic technique termed: Shakedown Direct Noncyclic Technique (SD_DNT) generates the SD boundaries via employing the small displacement formulation in the FE simulations. Comparing the SD boundaries generated via both methods illustrated marked increase in the generated SD domains due to employing large displacement.

scholarly journals Pushover Tests on Unreinforced Masonry Wallettes Retrofitted with an Innovative Coating: Experimental Study and Finite Element Modelling

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6815
Author(s):  
Jean-Patrick Plassiard ◽  
Mathieu Eymard ◽  
Ibrahim Alachek ◽  
Olivier Plé
Keyword(s):  
Experimental Study ◽  
Finite Element ◽  
Finite Element Modelling ◽  
Unreinforced Masonry ◽  
Failure Pattern ◽  
Finite Element Models ◽  
Strength Gain ◽  
Continuum Approach ◽  
Element Modelling ◽  
Significant Strength

This paper investigates the mechanical contribution of an innovative coating applied on masonry wallettes compared to a traditional one. In both cases, the multifunctional coatings were insulating coatings intended for thermal refurbishment, but they could also be used to retrofit masonry. Uncoated specimens as well as coated ones were submitted to pushover tests to establish the strength gain. URM walls experienced brittle failures while the coated walls exhibited significant strength gains and strong ductility. The corresponding finite element models were developed. The behaviour of the URM walls was reproduced accurately in terms of strength and failure pattern. Models involving the coatings were used to partially retrieve the behaviour and to highlight the issues of a continuum approach.

Influence of Angle Thickness towards Stiffness and Strength Prediction for Cold-Formed Steel Top-Seat Flange Cleat Connection

2013 ◽  
Vol 479-480 ◽  
pp. 1144-1148 ◽  
Author(s):  
Yeong Huei Lee ◽  
Cher Siang Tan ◽  
M.Md. Tahir ◽  
Shahrin Mohammad ◽  
Poi Ngian Shek ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Modelling ◽  
Structural Integrity ◽  
Structural Performance ◽  
Design Stage ◽  
Strength Prediction ◽  
Finite Element Models ◽  
Steel Framing ◽  
Cold Formed Steel ◽  
Thin Walled

For the connection stiffness and strength prediction, Eurocode has showed an inadequacy as it will be affected by the thin-walled behaviour of cold-formed steel in actual structural performance. This paper performs a study on the connection stiffness prediction for cold-formed steel top-seat flange cleat connection with various angle thickness. Validated finite element modelling technique is applied for further advanced investigation. From the developed finite element models, it was realized that Eurocode has overestimated by the analytical stiffness prediction using component method for the studied connection which reduces the structural integrity in the design stage. A new proposal on connection stiffness prediction with influence of angle thickness for cold-formed steel top-seat flange cleat connection is presented to assist practicing engineers to design the cold-formed connection in light steel framing.

Static and dynamic axial collapse of fibreglass composite thin-walled tubes: finite element modelling of the crush zone

2003 ◽  
Vol 8 (3) ◽  
pp. 247-254 ◽  
Author(s):  
A G Mamalis ◽  
D E Manolakos ◽  
M B Ioannidis ◽  
P K Kostazos ◽  
E C Chirwa
Keyword(s):  
Finite Element ◽  
Finite Element Modelling ◽  
Element Modelling ◽  
Thin Walled ◽  
Crush Zone

Initial imperfections and the initiation of wrinkling in finite element modelling of deep drawing

2000 ◽  
Vol 214 (1) ◽  
pp. 63-73 ◽  
Author(s):  
J Hematian ◽  
P M Wild
Keyword(s):  
Finite Element ◽  
Deep Drawing ◽  
Finite Element Modelling ◽  
Annular Plate ◽  
Finite Element Models ◽  
Essential Requirement ◽  
Element Modelling ◽  
Initial Imperfections ◽  
Different Types ◽  
Out Of Plane

The effect of initial imperfections on the initiation of wrinkling in finite element models of deep drawing operations is assessed. Models of an annular plate are subjected to radial in-plane loading and the effects of different types, magnitudes and distributions of imperfections are investigated. A model of a circular plate subjected to out-of-plane loading from a punch and die is similarly investigated and the results are compared with experimental data. It is confirmed that initial imperfections are an essential requirement for the initiation of wrinkling for the case of in-plane loading. Initial imperfections are shown to be unimportant in the initiation of wrinkling for the case of out-of-plane loading.

New Computer Aided Design, Finite Element Modelling and Three-Dimensional Measuring of Rear Screen Creep Forming

1995 ◽  
Vol 209 (2) ◽  
pp. 137-143 ◽  
Author(s):  
D Lochegnies ◽  
E François ◽  
J Oudin
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Computer Aided Design ◽  
Finite Element Modelling ◽  
Three Dimensional ◽  
Finite Element Models ◽  
Element Modelling ◽  
Computer Aided ◽  
Analysis Strategy ◽  
Aided Design

A new analysis strategy for creep forming by coupling computer aided design (CAD), finite element models (FEM) and three-dimensional measuring (3D M) with two new CAD/FEM and CAD/3D M interfaces. From the design product via Bézier curves, the manufacturer is now able to predict and adjust creep forming database (initial form of the sheet, geometry of the skeleton, temperature map in the sheet at the furnace exit and forming time) through CAD and FE modules. A reference rear screen manufacture is optimized using the previous strategy and validated with the experimental data through CAD and 3D M modules.

Lagrangian Methods of Finite Element Simulations in Sheet Metal Forming Process

2014 ◽  
Vol 563 ◽  
pp. 3-6
Author(s):  
Lei Chen ◽  
Hui Qin Chen ◽  
Zhi Hua Li ◽  
Qiao Yi Wang
Keyword(s):  
Finite Element ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Finite Element Simulations ◽  
Lagrangian Formulation ◽  
Large Displacement ◽  
Small Displacement ◽  
Finite Element Models ◽  
Lagrangian Methods

Simulation method has become an increasing important problem to establish the trustworthiness of models in the finite element simulations. Finite element models in sheet metal forming, which involves large deformations, large displacement and friction, are uncertainly with different methods. Finite element models based on different Lagrangian methods have been used to analyze the deep drawing process. The tools are modeled as rigid surfaces. The blank is modeled as a deformable body. The interaction of sliding surfaces is modeled with a modified Coulomb friction law. The Finite element results of strain and thickness distributions are validated by comparison with the experiment. It is shown that the main difference of Total Lagrangian formulation (T.L.) and Updated Lagrangian formulation (U.L.) lies in the large displacement and deformation, whilst agree well with small displacement and deformation.

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