THREE-DIMENSIONAL FE ANALYSIS OF HEADED STUD ANCHORS EXPOSED TO FIRE

2007 ◽  
pp. 177-198 ◽  
Author(s):  
J. Ozbolt ◽  
I. Kozar ◽  
G. Periškić
Keyword(s):  
Three Dimensional ◽  
Fe Analysis ◽  
Headed Stud

Three-dimensional FE analysis of headed stud anchors exposed to fire

2005 ◽  
Vol 2 (4) ◽  
pp. 249-266 ◽  
Author(s):  
Josko Ozbolt ◽  
Ivica Koxar ◽  
Rolf Eligehausen ◽  
Goran Periskic
Keyword(s):  
Three Dimensional ◽  
Fe Analysis ◽  
Headed Stud

Pavement Damage Due to Conventional and New Generation of Wide-Base Super Single Tires

2005 ◽  
Vol 33 (4) ◽  
pp. 210-226 ◽  
Author(s):  
I. L. Al-Qadi ◽  
M. A. Elseifi ◽  
P. J. Yoo ◽  
I. Janajreh
Keyword(s):  
Carrying Capacity ◽  
Material Properties ◽  
Three Dimensional ◽  
Fe Analysis ◽  
Load Carrying Capacity ◽  
Inflation Pressure ◽  
3D Finite Element ◽  
Load Carrying ◽  
Pavement Damage ◽  
New Generation

Abstract The objective of this study was to quantify pavement damage due to a conventional (385/65R22.5) and a new generation of wide-base (445/50R22.5) tires using three-dimensional (3D) finite element (FE) analysis. The investigated new generation of wide-base tires has wider treads and greater load-carrying capacity than the conventional wide-base tire. In addition, the contact patch is less sensitive to loading and is especially designed to operate at 690kPa inflation pressure at 121km/hr speed for full load of 151kN tandem axle. The developed FE models simulated the tread sizes and applicable contact pressure for each tread and utilized laboratory-measured pavement material properties. In addition, the models were calibrated and properly validated using field-measured stresses and strains. Comparison was established between the two wide-base tire types and the dual-tire assembly. Results indicated that the 445/50R22.5 wide-base tire would cause more fatigue damage, approximately the same rutting damage and less surface-initiated top-down cracking than the conventional dual-tire assembly. On the other hand, the conventional 385/65R22.5 wide-base tire, which was introduced more than two decades ago, caused the most damage.

An experimental and numerical study of the fracture behaviour of tubular specimens in a pin-loading-tension set-up

2009 ◽  
Vol 224 (1) ◽  
pp. 1-12 ◽  
Author(s):  
M K Samal ◽  
G Sanyal ◽  
J K Chakravartty
Keyword(s):  
Numerical Study ◽  
Three Dimensional ◽  
Analytical Techniques ◽  
Limit Load ◽  
Initial Crack ◽  
Fe Analysis ◽  
Loading Path ◽  
Set Up ◽  
Loading Parameter ◽  
Tubular Specimens

Evaluation of a valid crack tip loading parameter using standard ASTM practice may not be feasible in many situations, e.g. in thin tubular specimens with diametrically opposite axial through-wall cracks (loaded in opening mode) that are obtained from zircaloy fuel pins of nuclear reactors. Recently, a pin-loading-tension (PLT) experimental set-up has evolved for this purpose. However, the required geometry functions (which should be obtained from a three-dimensional (3D) finite-element (FE) analysis procedure) for evaluation of the stress intensity factor (SIF) for such a set-up is not available in the literature. In this work, a detailed 3D FE analysis of the PLT set-up has been carried out where both the pin and the mandrel have been modelled. Analysis has been carried out for the full loading path (i.e. for applied displacements beyond the limit load of the specimen) in order to demonstrate the effectiveness of the model and the results have been compared with those of the experiment. In addition, the SIFs (and geometry functions) of the PLT set-up (with different initial crack lengths) have been evaluated from the FE results using extrapolation techniques and were compared with the results from two different analytical techniques.

scholarly journals Mid-Term Results of Total Hip Arthroplasty Using A Three-Dimensional Porous Titanium Acetabular Cup: An Examination of Micromotion Using Subject-Specific Finite Element Analysis

2021 ◽  
Author(s):  
Takaki Miyagawa ◽  
Kazu Matsumoto ◽  
Shingo Komura ◽  
Haruhiko Akiyama
Keyword(s):  
Finite Element ◽  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Three Dimensional ◽  
Porous Titanium ◽  
Fe Analysis ◽  
Total Hip ◽  
Radiolucent Lines ◽  
Subject Specific

Abstract Background: We investigated the mid-term clinical and radiological results of total hip arthroplasty (THA) using a three-dimensional (3D) porous titanium cup and analysed the micromotion at the interface of the cup using subject-specific finite element (FE) analysis. Methods: We evaluated 73 hips of 65 patients (6 men and 59 women; mean age at the time of surgery 62.2 years, range 45-86 years) who had undergone THA using a 3D porous titanium cup. Clinical evaluation was performed using the Japanese Orthopaedic Association (JOA) hip score system. We assessed the fixation of the acetabular component based on the presence of radiolucent lines and cup migration using anteroposterior radiographs. Subject-specific FE models were constructed from computed tomography data. Results: The JOA score improved from a preoperative mean of 52.2 (range, 23-82) to a mean of 87.8 (range, 71-100) at the final follow-up. None of the patients underwent revisions during the follow-up period. Radiolucent lines were observed in 26 cases (35.6%) and frequently appeared at DeLee and Charnley Zone 3. In the FE analysis, the micromotion at DeLee and Charnley Zone 3 was significantly larger than that at Zones 1 and 2. Furthermore, micromotion was large in the groups in which radiolucent lines appeared at Zone 3. Conclusions: The mid-term clinical outcome of THA using a 3D porous titanium cup was excellent. However, radiolucent lines frequently appeared at DeLee and Charnley Zone 3. FE analysis indicated that micromotion was large at the same site, strongly suggesting that it contributes to the emergence of radiolucent lines. The 3D porous titanium cups are useful in THA, and with improvements focused on micromotion, we anticipate better long-term outcomes.

scholarly journals Numerical Investigation on Steel Square HSS Columns Strengthened with Polymer-mortar

2019 ◽  
pp. 1-25
Author(s):  
Khaled M. El-Sayed ◽  
Ahmed S. Debaiky ◽  
Nader N. Khalil ◽  
Ibrahim M. El-Shenawy
Keyword(s):  
Three Dimensional ◽  
Shell Element ◽  
Fe Analysis ◽  
Experimental Results ◽  
Fe Model ◽  
Cross Sectional ◽  
Axial Strength ◽  
Polymer Mortar ◽  
Slender Columns ◽  
Good Agreement

This paper presents the results of finite element (FE) analysis of axially loaded square hollow structural steel (HSS) columns, strengthened with polymer-mortar materials. Three-dimensional nonlinear FE model of HSS slender columns were developed using thin-shell element, considering geometric and material nonlinearity. The polymer-mortar strengthening layer was incorporated using additional layers of the shell element. The FE model has been performed and then verified against experimental results obtained by the authors [1]. Good agreement was observed between FE analysis and experimental results. The model was then used in an extended parametric study to examine selected AISC square HSS columns with different cross-sectional geometries, slenderness ratios, thicknesses of mortar strengthening layer, overall geometric imperfections, and level of residual stresses. The effectiveness of polymer-mortar in increasing the column’s axial strength is observed. The study also demonstrated that polymer-mortar strengthening materials is more effective for higher slenderness ratios. An equivalent steel thickness is also accounted for the mortar strengthened HSS columns to discuss the effectiveness of polymer-mortar strengthening system. The polymer-mortar strengthening system is more effective for HSS columns with higher levels of out-of-straightness. Level of residual stress has a slight effect on the gain in the column’s axial strength strengthened with polymer-mortar.

scholarly journals DESCRIBING STRESS CONCENTRATION FACTORS OF AN INTERNALLY PRESSURIZED CYLINDER WITH AN IMBEDDED HOLE BY NEW FORMULATION

2020 ◽  
Author(s):  
javad jafari fesharaki
Keyword(s):  
Stress Concentration ◽  
Three Dimensional ◽  
Fe Analysis ◽  
Internal Diameter ◽  
Concentration Factors ◽  
Stress Concentration Factors ◽  
New Formulation ◽  
Von Mises ◽  
Von Mises Stresses ◽  
Pressurized Cylinder

The purpose of this paper is to investigate the stress concentration factor(SCF) for an internallypressurized cylinder with hole and based on detailed three-dimensional elastic FE analysis, a newcomprehensive set of formulas for SCFs are proposed. These stress concentration factors are presentedand discussed as a function of the ratio of cylinder diameter to the thickness of cylinder and hole diameter.The first ratio “D/100t” is equal to 1, 1.25, 1.5, 1.75, 2, 2.5, 2.75, 3, 3.25 and 3.5 and the second ratio“D/10d”, cylinder internal diameter to the hole diameter, varies from 0.6, 0.9, 1.2, 1.5, 1.8, 2, 2.3, 2.7,3.1and 3.5. Results are also presented for SCF of longitudinal, circumferential and Von Mises stresses.

scholarly journals Fatigue Strength Assessment of Trimaran Cross-Deck Structure Based on Spectral and Simplified Fatigue Method

2019 ◽  
Vol 2019 ◽  
pp. 1-13
Author(s):  
Chunbo Zhen ◽  
Tianlin Wang ◽  
Pengyao Yu ◽  
Liang Feng
Keyword(s):  
Transfer Functions ◽  
Three Dimensional ◽  
Stress Transfer ◽  
Direct Calculation ◽  
Fatigue Behaviour ◽  
Fatigue Analysis ◽  
Fe Analysis ◽  
Linear Potential ◽  
Wave Loads ◽  
Strength Assessment

In order to investigate the fatigue behaviour of trimaran cross-deck structural details, the spectral and simplified fatigue analysis approaches are proposed. In spectral fatigue approach, three-dimensional (3D) linear potential flow theory and global FE analysis are used for wave loads and stress transfer functions calculation; the stochastic spectral fatigue analysis is carried out considering the weighted wave headings factors. In simplified fatigue approach, based on the direct calculation procedure of LR rules, the evaluation of simplified fatigue loads and loading conditions are presented, and the stress ranges are obtained by global finite element (FE) analysis. Then the fatigue lives of a few hot spots are computed to demonstrate the application of the proposed method. The result shows that the method given in this paper has a good applicability. This study offers methodology for the fatigue analysis of trimaran cross-deck structure, which may be regarded as helpful references for structural design of these types of ships.

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