scholarly journals Distribution of Lateral Forces on Reinforced Masonry Bracing Elements Considering Inelastic Material Behavior - Deformation-Based Matrix Method-

2021 ◽  
Author(s):  
Michel Kenan ◽  
◽  
Keyword(s):  
Matrix Method ◽  
Material Behavior ◽  
Lateral Forces ◽  
Reinforced Masonry ◽  
Inelastic Material

Prediction of Stress Relaxation in Power Plant Components Based on a Constitutive Model

2017 ◽  
Author(s):  
Y. Kostenko ◽  
K. Naumenko
Keyword(s):  
Power Plant ◽  
Stress Relaxation ◽  
Constitutive Model ◽  
Evolution Equations ◽  
Material Behavior ◽  
Assessment Procedure ◽  
Reliable Prediction ◽  
Inelastic Material ◽  
Plant Components

Many power plant components and joint connections are subjected to complex thermo-mechanical loading paths under severe temperature environments over a long period. An important part in the lifetime assessment is the reliable prediction of stress relaxation using improved creep modeling to avoid possible integrity or functionality issues and malfunction in such components. The aim of this work is to analyze the proposed constitutive model for advanced high chromium steels with the goal of predicting stress relaxation over the long term. The evolution equations of the constitutive model for inelastic material behavior are introduced to account for hardening and softening phenomena. The material properties were identified for 9–12%CrMoV steels in the creep range. The model is applied to the stress relaxation analysis of power plant components. The results for long-term assessment, which are encouragingly close to reality, will be presented and discussed. An outlook on further developments of the model and assessment procedure is also provided.

Inelastic material behavior of polymers – Experimental characterization, formulation and implementation of a material model

2012 ◽  
Vol 52 ◽  
pp. 40-57 ◽  
Author(s):  
Markus Kästner ◽  
Martin Obst ◽  
Jörg Brummund ◽  
Karin Thielsch ◽  
Volker Ulbricht
Keyword(s):  
Material Model ◽  
Material Behavior ◽  
Experimental Characterization ◽  
Inelastic Material

Effect of Manufacturing Process on Lined Pipe Bending Response1

2020 ◽  
Vol 142 (5) ◽  
Author(s):  
Ilias Gavriilidis ◽  
Spyros A. Karamanos
Keyword(s):  
Manufacturing Process ◽  
Three Dimensional ◽  
Local Buckling ◽  
Numerical Results ◽  
Material Behavior ◽  
Manufacturing Processes ◽  
Three Dimensional Model ◽  
Imperfection Sensitivity ◽  
Mechanical Process ◽  
Inelastic Material

Abstract The effects of manufacturing process on mechanically lined pipe structural performance are investigated. Alternative manufacturing processes are considered, associated with either purely hydraulic or thermo-hydraulic expansion. The problem is solved numerically, accounting for geometric nonlinearities, local buckling phenomena, inelastic material behavior and contact between the two pipes. A three-dimensional model is developed, which simulates the manufacturing process in the first stage of the analysis and, subsequently, proceeds in the bending analysis of the lined pipe. This integrated two-stage approach constitutes the major contribution of the present research. Thermo-hydraulically expanded lined pipes are examined, with special emphasis on the case of partially heated liners, and reverse plastic loading in the liner pipe wall has been detected during depressurization. Furthermore, the numerical results show that the thermo-mechanical process results in higher mechanical bonding between the two pipes compared with the purely mechanical process and that this bonding is significantly influenced by the level of temperature in the liner pipe. It is also concluded that the value of initial gap between the two pipes before fabrication has a rather small effect on the value of liner buckling curvature. Finally, numerical results on imperfection sensitivity are reported for different manufacturing processes, and the beneficial effect of internal pressure on liner bending response is verified.

Strength and Deformation of Confined Brick Masonry Walls Subjected to Lateral Forces – Review of Existing Test Data in Japan and Peru –

2014 ◽  
Vol 9 (6) ◽  
pp. 984-992 ◽  
Author(s):  
Shunsuke Sugano ◽  
◽  
Taiki Saito ◽  
Carlos Zavala ◽  
Lourdes Cardenas ◽  
...  
Keyword(s):  
Regression Analysis ◽  
Good Accuracy ◽  
Brick Masonry ◽  
Maximum Strength ◽  
Masonry Walls ◽  
Empirical Equations ◽  
Ultimate State ◽  
Lateral Forces ◽  
Reinforced Masonry ◽  
Strength And Deformation

The Japanese and Peruvian experimental databases on confined brick masonry walls are put together as one database, and the strength and deformation of the walls are reviewed. First, the applicability of existing equations for the ultimate strength of reinforced concrete or reinforced masonry walls to the estimation of the maximum strength of confined brick masonry walls which failed in shear, flexural-shear, or flexure when subjected to lateral forces, is discussed. Then, empirical equations for the maximum strength, displacement at maximum strength, and ultimate state of the walls are proposed based on multiple regression analysis, and the accuracy of the proposed equations is discussed. It is concluded that the maximum strength can be estimated using the existing equations or the proposed empirical equations with good accuracy. The deformations at maximum strength and the ultimate state can be estimated using the proposed empirical equations, although there is a large amount of scatter.

Validation of Sound Source Simulation due to Offshore Pile Driving

2015 ◽  
Author(s):  
Katja Reimann ◽  
Juergen Grabe
Keyword(s):  
Wave Propagation ◽  
Sound Source ◽  
Friction Angle ◽  
Sound Level ◽  
Material Behavior ◽  
Wall Friction ◽  
Parameter Study ◽  
Pile Driving ◽  
Linear Elastic ◽  
Inelastic Material

The influence of wave propagation through the soil on hydro sound immission due to offshore pile driving bears a lot of uncertainties. In acoustic analyses of impact pile driving, the sound source description is essential for wave propagation models. The excited open-ended steel pile and the soil interact with each other. In numerical analyses the choice of the used material law for the soil should be well suited, because of the effect on the pile vibration. Prognoses often use the linear elastic approach for non-cohesive granular materials which does not represent the inelastic material behavior of the soil. On the basis of experimental data, a numerical model to simulate one blow of impact pile driving is validated. A parameter study of the wall friction angle between steel and sand is conducted to investigate the influence on the radiated hydro sound level under drained conditions.

The Effect of Stress-State on the Large Strain Inelastic Deformation Behavior of 304L Stainless Steel

1996 ◽  
Vol 118 (1) ◽  
pp. 28-36 ◽  
Author(s):  
M. P. Miller ◽  
D. L. McDowell
Keyword(s):  
Stainless Steel ◽  
Stress State ◽  
Strain Hardening ◽  
Crystallographic Texture ◽  
Inelastic Deformation ◽  
Large Strain ◽  
Relative Effect ◽  
Material Behavior ◽  
304L Stainless Steel ◽  
Inelastic Material

In metals, large strain inelastic deformation processes such as the formation of a preferred crystallographic orientation (crystallographic texture) and strain hardening processes such as the formation and evolution of dislocation substructures depend on stress-state. Much of the current large strain research has focused on texture. Crystallographic texture development and strainhardening processes each contribute to the overall material behavior, and a complete description of large strain inelastic material response should reflect both. An investigation of the large strain behavior of 304L stainless steel (SS 304L) subjected to compression, torsion, and sequences of compression followed by torsion and torsion followed by tension is reported. This paper focuses on the stress-state dependence of strain-hardening processes as well as the relative effect such processes have on the overall material behavior. To characterize these processes, transmission electron microscopy (TEM) as well as magnetization investigations were conducted at different strain levels and under different deformation modes. The γ → α′ martensitic transformation which occurs in this material was found to be related to both the strain level and stress state. Dislocation substructures in the form of Taylor lattices, dense dislocation walls, and microbands were also present. The ramifications of using a thin-walled tubular torsion specimen were also explored.

An Internal Variable Update Procedure for the Treatment of Inelastic Material Behavior within an ALE-Description of Rolling Contact

2007 ◽  
Vol 9 ◽  
pp. 157-171 ◽  
Author(s):  
M. Ziefle ◽  
U. Nackenhorst
Keyword(s):  
Contact Problems ◽  
Internal Variable ◽  
Rolling Contact ◽  
Material Behavior ◽  
Internal Variables ◽  
Arbitrary Lagrangian Eulerian ◽  
Element Analysis ◽  
Integration Schemes ◽  
Inelastic Material ◽  
Ale Methods

Arbitrary Lagrangian Eulerian (ALE) methods provide a well established basis for the numerical analysis of rolling contact problems, the theoretical framework is well developed for elastic constitutive behavior. Special measures are necessary for the treatment of history dependent and explicitly time dependent material behavior within the relative–kinematic ALE– picture. In this presentation a fractional step approach is suggested for the integration of the evolution equation for internal variables. A Time–Discontinuous Galerkin (TDG) method is introduced for the numerical solution of the related advection equations. The advantage of TDG–methods in comparison with more traditional integration schemes is studied in detail. The practicability of the approach is demonstrated by the finite element analysis of rolling tires.

Finite element analysis for time-dependent inelastic material behavior

1976 ◽  
Vol 6 (3) ◽  
pp. 157-162 ◽  
Author(s):  
M. Newman ◽  
Z. Zaphir ◽  
S.R. Bodner
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Material Behavior ◽  
Time Dependent ◽  
Element Analysis ◽  
Inelastic Material

Simple Solutions of the Free-Edge Stresses in Composite Laminates under Thermal and Mechanical Loads

1994 ◽  
Vol 28 (6) ◽  
pp. 573-586 ◽  
Author(s):  
Wan-Lee Yin
Keyword(s):  
Composite Laminates ◽  
Constitutive Relations ◽  
Free Edge ◽  
Normal Derivative ◽  
Boundary Region ◽  
Material Behavior ◽  
Interlaminar Stresses ◽  
Inelastic Material ◽  
Stress Functions ◽  
Temperature Loads

Intense and localized interlaminar stresses generally occur in a narrow boundary region near the free edge of a multilayered anisotropic laminate under mechanical and temperature loads. Quantitative measures of interlaminar action across interfaces may be readily obtained through purely algebraic operations, even if nonlinear and inelastic material behavior becomes significant in the boundary region due to severe strain concentration. These measures are the limiting values of the Lekhnitskii stress functions F and $$ (and of the normal derivative of F) along interfaces and toward the interior region of the laminate. In the present work, they are used as the basis of an exceedingly simple and efficient method of interlaminar stress analysis that is potentially applicable to free-edge problems involving nonlinear thermoelastic constitutive relations. Example solutions are obtained for symmetric, four-layer, cross-ply and angle-ply laminates under a temperature load and two different types of strain loads, and the results are found to be in reasonable agreement with the existing numerical and analytical solutions based on elaborate analysis methods.

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