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.

Three-Dimensional Analyses of Single Rivet-Row Lap Joints — Part II: Elastic-Plastic Response

1999 ◽  
Author(s):  
K. Iyer ◽  
C. A. Rubin ◽  
G. T. Hahn
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Lap Joints ◽  
Finite Element Analyses ◽  
Lap Joint ◽  
Stress Concentrations ◽  
Elastic Plastic ◽  
Linear Elastic ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Abstract Three-dimensional finite element analyses of an elastic-plastic, single rivet-row, aluminum lap joint are presented and compared with previous results for linear elastic models. The calculations treat non-countersunk aluminum and steel rivets, 3 different configurations of countersunk rivets as well as two values of the friction coefficient. The compliance of the connection, rivet tilt, the stresses in the panels, peak plastic strains and the contact pressures and slip amplitudes at the rivet-panel and panel-panel interfaces are evaluated. The transverse, axial, and shear stress distributions and the stress concentrations generated in four different rivets are derived from the linear elastic models and related to the rivet geometry. Laboratory measurements of the lap joint compliance and local out-of-plane displacements that support the reliability of the finite element analyses are presented.

REINFORCEMENT OF AGEING SHIP STRUCTURES

2021 ◽  
Vol 160 (A3) ◽  
Author(s):  
D Chichì ◽  
Y Garbatov
Keyword(s):  
Monte Carlo Simulation ◽  
Finite Element ◽  
Ultimate Strength ◽  
Steel Plate ◽  
Plate Thickness ◽  
Compressive Load ◽  
Finite Element Models ◽  
Uniform Corrosion ◽  
Finite Element Analyses ◽  
Longitudinal Stiffeners

The objective of the present study is to investigate the possibility to recover the ultimate strength of a rectangular steel plate with a manhole shape opening subjected to a uniaxial compressive load and non-uniform corrosion degradation reinforced by additional stiffeners. Finite element analyses have been carried out to verify the possible design solutions. A total of four finite element models are generated, including 63 sub-structured models. The non-uniform corrosion has been generated by the Monte Carlo simulation. The reinforcement process covers three scenarios that include mounting of two longitudinal stiffeners, two longitudinal and two transverse stiffeners and the flange on the opening. The positioning of the stiffeners has also been studied. A total of 10 cases has been selected and tested for the numerical experiment. Three different assessments have been performed to evaluate the ultimate strength, weight and cost. Two additional studies on the effect of the plate thickness and slenderness have been also carried out.

Probabilistic Models to Approximate Highly Repetitive Linear and Nonlinear Finite Element Analyses of Nuclear Components

2009 ◽  
Author(s):  
Dan Vlaicu ◽  
Mike Stojakovic
Keyword(s):  
Finite Element ◽  
Material Properties ◽  
Probabilistic Models ◽  
Nonlinear Material ◽  
Superposition Method ◽  
Loading Conditions ◽  
Finite Element Analyses ◽  
Axisymmetric Nozzle ◽  
Nonlinear Superposition ◽  
Pipe Bend

In the development and technical support of nuclear plants, Engineers have to deal with highly repetitive finite element analyses that involve modeling of local variations of the initial design, local flaws due to corrosion-erosion effects, material properties degradation, and modifications of the loading conditions. This paper presents the development of generic models that emulate the behavior of a complex finite element model in a simplified form, with the statistical representation based on a sampling of base-model data for a variety of test cases. An improved Latin Hypercube algorithm is employed to generate the sampling points based on the number and the range of the variables that are considered in the design space. Four filling methods of the approximation models are discussed in this study: response surface, nonlinear, neural networks, and piecewise polynomial model. Furthermore, a bootstrapping procedure is employed to improve the confidence intervals of the original coefficients, and the single-factor or double-factor analysis of variance is applied to determine whether a significant influence exists between the investigated factors. Two numerical examples highlight the accuracy and efficiency of the methods. The first example is the linear elastic analysis of a pipe bend under pressure loading. The objective of the probabilistic assessment is to determine the relation between the loading conditions as well as the geometrical aspects of this elbow (pipe wall thickness, outside diameter, elbow radius, and maximum ovality tolerance) and the maximum stress in the elbow. The second example is an axisymmetric nozzle under primary and secondary cycling loads. Variations of the geometrical dimensions, nonlinear material properties, and cycling loading are taken as the input parameters, whereas the response variable is defined in terms of Melan’s theorem translated into the Nonlinear Superposition Method.

B205 Finite Element Stress Analyses of the Intervertebral Disc of the Rheumatoid Cervical Spine

2006 ◽  
Vol 2006.17 (0) ◽  
pp. 121-122
Author(s):  
Hiromi SUZUKI ◽  
Nozomu INOUE ◽  
Ryota TAKATORI ◽  
Daisaku TOKUNAGA ◽  
Hitoshi HASE ◽  
...  
Keyword(s):  
Finite Element ◽  
Cervical Spine ◽  
Intervertebral Disc ◽  
Finite Element Stress ◽  
Stress Analyses

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.

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