Shear stress concentrations in tramway rails: Results from beam theory-based cross-sectional 2D Finite Element analyses

2019 ◽  
Vol 195 ◽  
pp. 579-590 ◽  
Author(s):  
Patricia Hasslinger ◽  
Aleš Kurfürst ◽  
Thomas Hammer ◽  
Edgar Fischmeister ◽  
Christian Hellmich ◽  
...  
Keyword(s):  
Finite Element ◽  
Shear Stress ◽  
Beam Theory ◽  
Finite Element Analyses ◽  
Stress Concentrations ◽  
Cross Sectional

Steel Sheet Shear Walls with Burring Holes for Low- to Mid-Rise Housings

2019 ◽  
Author(s):  
Yoshimichi Kawai ◽  
Shigeaki Tohnai ◽  
Shinichiro Hashimoto ◽  
Atsushi Sato ◽  
Tetsuro Ono
Keyword(s):  
Finite Element ◽  
Shear Stress ◽  
Large Deformation ◽  
Deformation Behavior ◽  
Steel Sheet ◽  
Shear Walls ◽  
Shear Load ◽  
Finite Element Analyses ◽  
Plane Shear ◽  
Out Of Plane

<p>Steel sheet shear walls with cold formed edge stiffened burring holes are applied to low- to mid-rise housings in seismically active and typhoon- or hurricane-prone regions. A configuration with burrs on the inside and smooth on the outside enables the construction of omitting the machining of holes for equipments and thinner walls with simplified attachments of finishings. In-plane shear experiments and finite element analyses revealed that the walls allowed shear stress to concentrate in intervals between the burring holes. The walls maintained stable shear load and large deformation behavior, and the deformation areas were limited in the intervals and a large out-of-plane waveform in a sheet was effectively prevented owing to edge stiffened burring ribs. The design methods are developed for evaluating the shear load of the walls at story angle from zero to 1/100, using the idea of decreasing the band width of the inclined tension fields on the intervals with the effects of the thickness.</p>

Modelling of Rotating Twisted Blades as 1D Continuum

2016 ◽  
Vol 821 ◽  
pp. 183-190
Author(s):  
Jan Brůha ◽  
Drahomír Rychecký
Keyword(s):  
Finite Element ◽  
Finite Elements ◽  
Beam Theory ◽  
Parameter Tuning ◽  
Finite Element Models ◽  
Cross Sectional ◽  
One Dimensional ◽  
Rayleigh Beam ◽  
Twisted Blade ◽  
Sectional Parameters

Presented paper deals with modelling of a twisted blade with rhombic shroud as one-dimensional continuum by means of Rayleigh beam finite elements with varying cross-sectional parameters along the finite elements. The blade is clamped into a rotating rigid disk and the shroud is considered to be a rigid body. Since the finite element models based on the Rayleigh beam theory tend to slightly overestimate natural frequencies and underestimate deflections in comparison with finite element models including shear deformation effects, parameter tuning of the blade is performed.

Some finite-element stress analyses of simulated diffusion-bonded lap joints

1977 ◽  
Vol 12 (4) ◽  
pp. 331-338 ◽  
Author(s):  
T R Gurney
Keyword(s):  
Finite Element ◽  
Plate Thickness ◽  
Lap Joints ◽  
Loading Conditions ◽  
Finite Element Analyses ◽  
Stress Concentrations ◽  
Young’S Moduli ◽  
Similar Materials ◽  
Finite Element Stress ◽  
Stress Analyses

A series of finite-element analyses have been carried out on lap joints between similar materials and between two materials with Young's moduli in the ratio 3:1. The main objectives of the work were to determine the influence of the ratio between the overlap distance and the plate thickness on the stress concentrations at the ends of the plates, and to examine the influence of tapering the ends of the plates. In the course of the work, comparisons were made between various loading conditions.

Finite Element Analysis in Orthopaedics

1987 ◽  
Vol 110 ◽  
Author(s):  
James B. Koeneman
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Beam Theory ◽  
Stress Distributions ◽  
Finite Element Analyses ◽  
Element Analysis ◽  
Bone Changes ◽  
Joint Implants ◽  
Bone Structures

AbstractPredicting the stress state in bones is important to the understanding of bone remodeling and the long-term reliability of total joint implants. Beam theory, 2-D and 3-D finite element analysis have been used to calculate stress distributions. These finite element analyses of bone structures are progressing from crude models for which the clinical relevance has been questioned to an important tool which is necessary to understand stress related bone changes.

Analysis of Global Load Effects in Catamarans

2002 ◽  
Vol 46 (02) ◽  
pp. 81-91
Author(s):  
Svein Erling Heggelund ◽  
Torgeir Moan
Keyword(s):  
Finite Element ◽  
Shear Stress ◽  
Beam Theory ◽  
Element Model ◽  
Design Stage ◽  
Reasonable Accuracy ◽  
Torsional Loading ◽  
Prismatic Beam ◽  
Load Effects ◽  
Longitudinal Bending

Relevant stresses and deformations resulting from longitudinal bending and torsion are calculated for a 60 m catamaran by a global finite-element model. The results are compared with results from prismatic beam theory modified to account for the effect of wide flanges and significant window openings typical for a catamaran hull. It is found that the global stresses are predicted with a reasonable accuracy for the initial design stage. In the present case, the effect of warping on shear stress due to torsional loading is moderate and can be neglected. However, this effect is strongly dependent on the vessel design and can be important for a vessel with narrower hulls and a superstructure that is lower relative to the total height.

scholarly journals Behaviour of Bi-Adhesive in Double-Strap Joint with Embedded Patch Subjected to Bending

2015 ◽  
Vol 45 (3) ◽  
pp. 83-96 ◽  
Author(s):  
Şemsettin Temiz ◽  
Hamit Adin ◽  
Ismail Yasin Sülü
Keyword(s):  
Finite Element ◽  
Joint Strength ◽  
Load Capacity ◽  
Finite Element Analyses ◽  
The Finite Element Method ◽  
Middle Portion ◽  
Stress Concentrations ◽  
Linear Finite Element ◽  
Failure Loads ◽  
Study Behaviour

Abstract In this study, behaviour of bi-adhesive used in the repair of damaged parts was analyzed, using the finite element method. In a double-strap joint with an embedded patch, patch is embedded into the adherents for structural requirements. In addition, to increase the strength of the joint, two adhesives are used to bond the adherents. This approach reduces stress concentration at the overlap ends, increases the load capacity and delays the failure. These effects give rise to higher joint strength. For this purpose, a stiff adhesive, FM73 produced by Cytec Fiberite, was applied in the middle portion of the overlap, while a softer adhesive, SBT9244 from 3M, was applied towards the edges, prone to stress concentrations. Non-linear finite element analyses were carried out to predict the failure loads, to assist with the geometric design and to identify effective ratios of sizes to maximize joint strength.

A Finite Element Analysis of Collapse of Perforated Casing

1983 ◽  
Vol 105 (3) ◽  
pp. 234-240 ◽  
Author(s):  
M. B. Smith ◽  
P. D. Pattillo
Keyword(s):  
Finite Element ◽  
Large Scale ◽  
Strength Reduction ◽  
Control Technique ◽  
Finite Element Analyses ◽  
Element Analysis ◽  
Cross Sectional ◽  
Loading Pattern ◽  
Nonuniform Loading ◽  
Definition Of

The purpose of this paper is to report the results of finite element analyses of the collapse of perforated casing. In the study, both inline (0-deg phasing) and staggered (90-deg phasing) patterns are considered. The primary intent of the study is to illustrate the severe loss of casing cross-sectional integrity accompanying extrusion of a ductile formation into the wellbore. It is shown that, for reasonable perforation densities, the primary effect of the perforation pattern is not strength reduction of the cross section, but definition of a nonuniform loading pattern resulting from formation production. In this regard, in the presence of large-scale formation failure in the near wellbore region, it is crucial to the integrity of the casing that a solids control technique be employed.

Solder Joint Reliability — Design Implications From Finite Element Modeling and Experimental Testing

1990 ◽  
Vol 112 (2) ◽  
pp. 135-146 ◽  
Author(s):  
H. K. Charles ◽  
G. V. Clatterbaugh
Keyword(s):  
Fracture Toughness ◽  
Finite Element ◽  
Fatigue Life ◽  
Solder Joint ◽  
Solder Joints ◽  
Experimental Testing ◽  
Sectional Area ◽  
Stress Concentrations ◽  
Cross Sectional ◽  
Power Cycling

An extensive finite element modeling and experimental testing program has been carried out to determine the most optimum design parameters for solder joints in surface mount applications. Although the analysis and testing (power cycling and thermal cycling) has been carried out for a variety of package styles, particular attention will be paid to the result for leadless ceramic chip carriers. This package is particularly useful in certain high performance military and commercial applications. Analysis and experimentation indicate that increased fatigue life under power cycling can be attained by fabricating solder joints with large fillets and low standoff heights. The large fillet geometry significantly reduces harmful stress concentrations while increasing the net cross-sectional area within the joint. Both factors tend to improve the fracture toughness of the joint. The temperature and frequency dependencies of solder joint fatigue life under power cycling testing is discussed. The observed frequency dependence can be minimized by eliminating harmful tensile strain components thus reducing harmful stress relaxation and tensile induced oxygen embrittlement of grain boundaries. Temperature cycling studies indicate joints with slightly higher standoffs and low fillet angles are more resistant to cyclic fatigue than pillar type joints which tend to focus shear strains at the interfaces. Solder joints can be tapered to improve overall reliability but, in most cases, tapering will provide only a small increase in fracture toughness of the joint through the elimination of stress concentrations. Additional fatigue life increases can be obtained only through an enlargement of the joint cross-sectional area. Aspects of the above results will be presented in detail along with design guidelines for creating high reliability solder joints for various application scenarios.

scholarly journals Patterns of stress and strain in complete-arch prostheses supported by four or six implants: A literature review of finite element analyses

2019 ◽  
Vol 10 (2) ◽  
pp. 77-84
Author(s):  
Nasrin Keshavarz Valian ◽  
Mohammad Reza Talebi Ardakani ◽  
Alireza Aziz Ahari ◽  
Mohammad Taghi Baghani ◽  
Shireen Shidfar
Keyword(s):  
Finite Element ◽  
Literature Review ◽  
Bone Graft ◽  
Literature Search ◽  
Angular Position ◽  
Stress And Strain ◽  
Finite Element Analyses ◽  
Stress Concentrations ◽  
Online Databases ◽  
The Subject

Background. Tilted implants have been recommended as an alternative to the bone graft procedures in implant sites although with possibly higher stress concentrations. This study reviews finite element studies to evaluate patterns of stress and strain in complete-arch prostheses supported by 4‒6 implants. Methods. A literature search was performed using the online databases. Articles published in English from 2003 to 2015 were reviewed. A total of 100 articles were found related to the subject and after evaluating the titles and abstracts, 18 studies were selected. Results. By increasing the number of implants, a reduction was detected in the amount of stress in the bone and implants, while in others, the stress level did not change with the increase in the number of implants. Conclusion. According to finite element analyses, placing a distal implant in an angular position results in better distribution of forces and stresses. Using less cantilever lengths would reduce the stress.

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