Finite element modelling of the shear lag effects in an HSS welded to a gusset plate

1995 ◽  
Vol 22 (4) ◽  
pp. 651-659 ◽  
Author(s):  
C. Girard ◽  
A. Picard ◽  
M. Fafard
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Element Modelling ◽  
Finite Element Analyses ◽  
Shear Lag ◽  
The Finite Element Method ◽  
Gusset Plate ◽  
Element Modelling ◽  
Lag Effects ◽  
Hollow Section

The behavior of a typical connection at the ends of an HSS bracing member was investigated with the finite element method. The connection is effected by means of a gusset plate welded into slots in the HSS member. The paper presents the results of the finite element analyses of 25 connections which differed in the values assigned to the three main parameters that were considered. The finite element results are compared with the provisions of CSA Standard S16.1-M89, and some adjustments to these provisions are recommended. Key words: connections, steel, shear lag, finite element, hollow section, gusset.

scholarly journals Finite element modelling of creep process - steady state stresses and strains

2014 ◽  
Vol 18 (suppl.1) ◽  
pp. 179-188 ◽  
Author(s):  
Aleksandar Sedmak ◽  
Ljubica Milovic ◽  
Mirko Pavisic ◽  
Pejo Konjatic
Keyword(s):  
Finite Element ◽  
Steady State ◽  
Finite Element Modelling ◽  
Residual Life ◽  
Longitudinal Crack ◽  
Real Life ◽  
Creep Process ◽  
The Finite Element Method ◽  
Cylindrical Pipe ◽  
Element Modelling

Finite element modelling of steady state creep process has been described. Using an analogy of visco-plastic problem with a described procedure, the finite element method has been used to calculate steady state stresses and strains in 2D problems. An example of application of such a procedure have been presented, using real life problem - cylindrical pipe with longitudinal crack at high temperature, under internal pressure, and estimating its residual life, based on the C*integral evaluation.

Behavior of Square Hollow Section Steel Tubes Filled with Concrete under Different Loading Conditions

2014 ◽  
Vol 577 ◽  
pp. 1097-1103
Author(s):  
Tian De Jin ◽  
Lan Hui Guo
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Yield Strength ◽  
Bearing Capacity ◽  
Area Ratio ◽  
Loading Conditions ◽  
The Finite Element Method ◽  
Hollow Section ◽  
Core Concrete ◽  
Element Method

In this paper, the behavior of composite stub columns under different loading conditions is studied using the finite element method. The accuracy of the theoretical method is validated by comparing with the experimental results. The behavior of specimen under different loading conditions is analyzed. Then, based on the finite element method, the comparison of mechanical behavior under three typical loading conditions is studied. The results show that the difference on bearing capacity will become larger with the increase of steel area to concrete area ratio. For the core concrete loaded specimen with lower steel area-to-concrete area ratio, whose bearing capacity is the lowest, but its ductility is very good. With the increase of the steel yield strength, the bearing capacity will increase evidently for specimen loaded simultaneously. While for the specimen with only core concrete loaded, the steel yield strength has little influence except increase of ductility.

Single-angle compression members welded by one leg to a gusset plate. II. A parametric study and design equation

1998 ◽  
Vol 25 (3) ◽  
pp. 585-594 ◽  
Author(s):  
Murray C Temple ◽  
Sherief SS Sakla
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Carrying Capacity ◽  
Load Carrying Capacity ◽  
Design Equation ◽  
Rigid Support ◽  
The Finite Element Method ◽  
Gusset Plate ◽  
Compression Members ◽  
Load Carrying

Single-angle compression members are complex members to analyze and design. The two generally accepted design procedures, the simple-column and the beam-column approaches, in general, underestimate the load-carrying capacity of single-angle compression members welded by one leg to a gusset plate fixed to a rigid support. One of the reasons is that these approaches do not properly account for the end constraint provided by the gusset plate. The effective length factor can be adjusted, but this is difficult to do as the end restraint is not easy to evaluate in many practical cases. Another reason is that these approaches are not based on a rational understanding of the failure mechanism of these members. An experimental program confirmed that the finite element method can be used, with a reasonable degree of accuracy, to predict the behavior and load-carrying capacity of single-angle compression members welded by one leg to a gusset plate fixed to a rigid support. The finite element method was used to study some 1800 different combinations of parameters. It was found that out-of-straightness, residual stresses in the angle section, Young's modulus of elasticity, and the unconnected gusset plate length do not have a great effect on the load-carrying capacity. The most significant parameter is the gusset plate thickness with the gusset plate width being the second most important parameter. An empirical design equation is proposed.Key words: angles, buckling, columns (structural), compressive resistance, design equation, gusset plates.

scholarly journals EFFECT OF FLAT AND HEMISPHERICALLY ENDED CYLINDER BIRD MODEL WITH FINITE ELEMENT MODELLING OF BIRD STRIKE

2019 ◽  
Vol 17 (1) ◽  
pp. 41
Author(s):  
Endah Yuniarti
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Element Modelling ◽  
Model Simulation ◽  
Material Model ◽  
Stagnation Pressure ◽  
Bird Strike ◽  
Element Modelling ◽  
Element Simulation ◽  
Simulation Results

This research studies influence of bird model on impact pressures during bird strike, namely Hugoniot and Stagnation pressure through initial modelling by numerical simulations using finite element method. Finite element simulation of bird strike have primarily modelled the bird as either a flat or hemispherically ended cylinder. The geometry is simulated with different L/D ratio, 1.4, 1.6, 1.8 and 2.0. Elastic-plastic hydrodynamic material model is used in simulation. Bird model simulation are using lagrangian method and initial velocities are 100, 200 and 300 m/s. Simulation results of hemispherically ended cylinder bird models show variation of L/D ratio provide Hugoniot pressure 10-19 times higher than stagnation pressure in L/D = 1.4, 8-18 times in L/D = 1.6, 9-17 times in L/D = 1.8 and 4-16 times in L/D = 2. The Hugoniot pressure shows a lower value at an L/D ratio of 1.6 compared to other ratios and the Stagnation pressure is higher at L/D ratio 2. As for cylindrical bird model show variation of L/D ratio provide Hugoniot pressure 35-38 times higher than stagnation pressure in L/D = 1.4, 30-47 times in L/D = 1.6, 31-52 times in L/D = 1.8 and 28-48 times in L/D = 2. The Hugoniot pressure shows a lower value at an L/D ratio of 1.4 and 1.6 compared to other ratios and the Stagnation pressure is higher at L/D ratio 2.

Finite Element Analyses of Circumferential Cracks in Thin-Walled Cylinders: T-Stress Solutions

2006 ◽  
Author(s):  
Timothy Lewis ◽  
Xin Wang ◽  
Robert Bell
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Fracture Mechanics ◽  
Fracture Analysis ◽  
Finite Element Analyses ◽  
The Finite Element Method ◽  
T Stress ◽  
Bending Loads ◽  
Pipe Radius ◽  
Thin Walled

The elastic T-stress is a parameter used to define the level of constraint at a crack tip. It is important to provide T-stress solutions for practical geometries in order to apply the constraint-based fracture mechanics methodology. In the present paper, T-stress solutions are provided for circumferential through-wall cracks in thin-walled cylinders. Cylinders with a circumferential through-wall crack were analyzed using the finite element method. Three cylinder geometries were considered; defined by the pipe radius (R) to wall thickness (t) ratios: R/t = 5, 10, and 20. The T-stress was obtained at eight crack lengths (θ/π = 0.0625, 0.1250, 0.1875, 0.2500, 0.3125, 0.3750, 0.4375, and 0.5000) for remote tension and remote bending loads. These results are suitable for constraint-based fracture analysis for cylinders with circumferential cracks.

Design of a 33-Knot Aluminum Catamaran Ferry

2000 ◽  
Vol 37 (02) ◽  
pp. 88-99
Author(s):  
R. G. Latorre ◽  
P. D. Herrington
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
High Speed ◽  
Frame Structure ◽  
Test Results ◽  
Finite Element Analyses ◽  
The Finite Element Method ◽  
Floating Frame ◽  
Good Agreement ◽  
Panel Design

This paper presents the results of an investigation on the suitability of using hull panels with alternating fixed and floating frames for a 30–40 knot aluminum catamaran ferry. A prototype 4.6 m × 1.8 m bottom hull panel with alternating frames is analyzed numerically and physically tested. The corresponding finite-element analyses and test results are in good agreement. The results show that the floating frame hull panel design is a feasible structure for an aluminum catamaran. The floating frame structure was then used for a 33-knot, 250-passenger aluminum catamaran ferry designed to meet the ABS High Speed Craft rules. A midship section of the catamaran hull was analyzed using the finite-element method. Catamaran weight estimates, heave and pitch motions, and powering estimates are also provided. The results show that the alternating floating frame structure was within the ABS rules stress allowables.

GENERAL BUCKLING ANALYSIS OF STEEL BUILT-UP COLUMNS USING FINITE ELEMENT MODELLING / PLIENINIŲ SPRAGOTŲJŲ KOLONŲ BENDROJO PASTOVUMO SKAIČIAVIMAS, MODELIUOJANT UŽDAVINĮ BAIGTINIAIS ELEMENTAIS

2012 ◽  
Vol 4 (1) ◽  
pp. 1-6
Author(s):  
Vaidotas Šapalas ◽  
Gintas Šaučiuvėnas ◽  
Arūnas Komka
Keyword(s):  
Finite Element ◽  
Finite Element Modelling ◽  
Numerical Experiments ◽  
Fem Analysis ◽  
Correction Factors ◽  
The Finite Element Method ◽  
Buckling Modes ◽  
Element Modelling ◽  
Eurocode 3 ◽  
Loaded Column

The paper investigates the general buckling of an axially loaded column using the finite element method with different slenderness ratios of axes x-x and z-z. The paper deals with three different modes of buckling. The conducted numerical experiments have suggested correction factors and appropriate buckling modes of the built-up columns. The obtained modelling results were compared with data on analytical calculations made according to Lithuanian national codes STR and Eurocode 3. The FEM analysis of the builtup column has showed that both codes (STR and EC3) are giving safe enough results for a considered type of conditions for column support. Santrauka Straipsnyje nagrinėjami plieninių spragotųjų kolonų elgsenos ypatumai, atsižvelgiant į skirtingas STR 2.05.08:2005 ir EC3-1-1 metodikas. Didžiausią susidomėjimą kelia faktas, kad, taikant EC3 metodiką, nėra nagrinėjama spragotosios kolonos kluptis apie didesnio standumo x-x ašį (1 pav.). Naudojantis turima ir kitų autorių patirtimi apžvelgta spragotosios centriškai gniuždomos kolonos elgsena, siekiant nustatyti jos klumpamąją galią, kai kolonos liauniai yra didesnio standumo, o mažesnio standumo plokštumoje yra skirtingi. Nagrinėtos trys skaičiuotinės situacijos: 1) spragotoji kolona idealiai tiesi, o abi kolonos juostos perima vienodas ašines jėgas (STR2.05.08:2005 prielaida); 2) spragotoji kolona tiesi, bet kolonos juostos ašinės jėgos padidintos dėl pradinio kolonos nuokrypio nuo tiesiosios ašies ir papildomo lenkiamojo momento (EC 3-1-1 prielaida); 3) kolona su pradiniu nuokrypiu, o ašinės juostų apkrovos yra vienodos (EC3-1-1 prielaida). Pradiniai modeliavimo duomenys pateikti 1 lentelėje. Kolonos juostos modeliuotos plokštelės tipo baigtinais elementais, o tinklelio strypai – strypiniais. Kolonos įtvirtinimo sąlygos ir skaičiuojamieji ilgiai pateikti 2 pav. Atlikus skaitinį modeliavimą gauti kolonos bendrojo klupumo pataisos koeficientai (2 lentelė) ir kolonos klupumo pavidalai (5 ir 6 pav.). Kaip matyti iš 7 pav., skaitinio modeliavimo rezultatai 2-uoju ir 3-iuoju atvejais yra skirtingi, nors turėtų būti vienodi modeliuojant pagal EC3 prielaidas. Galima teigti, kad antruoju atveju (spragotoji kolona tiesi, bet kolonos juostų ašinės jėgos padidintos dėl pradinio kolonos nuokrypio ir papildomo lenkiamojo momento) gaunami tikslesni rezultatai. Skirtumas tarp 1-ojo (STR) ir 2-ojo atvejo (EC3) nėra didelis; nuo 22% iki 30% (9 pav.). Kai kolonos liaunis λ x=35, pataisos koeficientas yra 2,11, naudojant EC3, ir 1,78, taikant STR metodą. Nedidelio liaunio kolonų bendrojo klupumo atsarga, naudojant EC3 prielaidas, yra 30% didesnė nei taikant STR metodą. Kai liaunis λ x=200, pataisos koeficientas yra 1,16 pagal EC3 ir 1,38 pagal STR metodiką. Liaunų kolonų klupumo atsarga pagal EC3 yra 23% mažesnė nei pagal STR metodą. 1-uoju ir 2-uoju atveju (1 lentelė) kolonų kluptis įvyko iš plokstumos apie z-z ašį (6 pav.), nes šioje plokštumoje kolonų liaunis didesnis. Kolonų klupumo pavidalas atitinka analitinius skaičiavimus tiek STR, tiek EC3 metodu. 3-uoju ir 4-uoju atveju (1 lentelė) kolonos klupo apie x-x ašį (5 pav.), nes šioje plokštumoje kolonos liaunis gerokai didesnis (2 pav.). Klupumo pavidalas atitinka analitinius skaičiavimus pagal STR metodiką. Taikant EC3 metodiką kolona turėjo klupti iš plokštumos, t. y. apie z-z ašį. Šis klupumo pavidalas taip pat buvo pasiektas, tačiau vėliau (žr. pataisos koeficientus 2 lentelėje.). Taip yra todėl, kad pagal EC3 metodiką tiesiog nereikalauja visos kolonos pastovumo tikrinti apie x-x ašį. Atlikus skaitinius modeliavimus galima teigti, kad abu metodai STR ir EC3 yra saugūs (pataisos koeficientai visada didesni už vienetą) duotomis kolonos galų įtvirtinimo sąlygomis. Tik mažo liaunio kolonų λx≤80 didesnė atsarga gauta STR metodu, o liaunų kolonų, kai λx>80 didesnė atsarga gauta taikant EC3 metodą.

scholarly journals Analysis of Contact Deformations in Support Systems Using Roller Prisms

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2644
Author(s):  
Krzysztof Nozdrzykowski ◽  
Zenon Grządziel ◽  
Paweł Dunaj
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Contact Theory ◽  
Finite Element Analyses ◽  
The Finite Element Method ◽  
Hertz Contact ◽  
Contact Points ◽  
Calculation Results ◽  
Reaction Forces ◽  
Shaft Journal

This article presents the results of finite element analyses of the influence of reaction forces on stresses and strains at the contact points of the rollers of prism supports with cylindrical surfaces of the main journals of large-sized crankshafts. The analyses of strains and stresses, as well as the depth of their occurrences, in the case of the shaft journal and support rollers were carried out using Hertz contact theory and the finite element method. These calculation results proved to be highly consistent. Additionally, they provide a basis for stating that, in the case under consideration, permanent deformations do not significantly affect the values of the measured geometrical deviations nor the profile forms of the supported main crankshaft journals.

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