scholarly journals Analysis of stress-strain states of casting crane traverse

2019 ◽  
Vol 110 ◽  
pp. 01049 ◽  
Author(s):  
Yurii Sahirov ◽  
Viktor Artiukh ◽  
Vladlen Mazur ◽  
Natalia Vaynshtok ◽  
Irina Reshetnikova
Keyword(s):  
Stress Distribution ◽  
Thermal Effects ◽  
Calculation Scheme ◽  
Equivalent Model ◽  
Stress Strain ◽  
Allowable Stresses ◽  
Cae System ◽  
Actual Stress

The purpose of this paper is to analyze actual stress-strain states of casting crane traverse taking into account weight of lifted load, thermal effects and additional inertial loads. The object of the study is a pattern of stress distribution inside the traverse elements. Methodology is proposed for modeling and analyzing stress-strain states of the casting crane traverse based on strength calculations considering allowable stresses and FEM. Calculation scheme and equivalent model were developed, and FEM calculation was performed in CAD/CAE system. Regularity of stress distribution in the traverse is obtained, and possible ways to further research are identified.

Reconstruction of Stress and Composition Profiles from X-Ray Diffraction Experiments — How to Avoid Ghost Stresses?

2004 ◽  
Vol 443-444 ◽  
pp. 91-94 ◽  
Author(s):  
Thomas L. Christiansen ◽  
Marcel A.J. Somers
Keyword(s):  
Depth Profile ◽  
Lattice Spacing ◽  
Lattice Strain ◽  
Strain Analysis ◽  
Weighted Average ◽  
X Ray Diffraction ◽  
Stress Strain ◽  
X Ray ◽  
Composition Profiles ◽  
Actual Stress

On evaluating lattice strain-depth or stress-depth profiles with X-ray diffraction, the variation of the information depth while combining various tilt angles, in combination with lattice spacing gradients leads to artefacts, so-called ghost or fictitious stresses. X-ray diffraction lattice-strain analysis was simulated for a model stress-depth profile combined with a composition-depth profile. Two principally different methods were investigated for the reconstruction of the actual stress and composition profiles from the simulated data: - considering the stress/strain determined at a specific depth as a weighted average over the actual stress/strain depth profile - considering the lattice spacing determined at a specific depth, for a specific value for as a weighted average over the actual lattice spacing profile for this direction. On the basis of the results it is possible to propose a preferred method for the evaluation of stress/strain and composition profiles, while minimising the risk for ghost stresses.

Modelling Recovery and Recrystallisation Kinetics after Intercritical Deformation in 0.19 wt% C 1.5 wt% Mn Steel

2004 ◽  
Vol 467-470 ◽  
pp. 329-334 ◽  
Author(s):  
A. Smith ◽  
A. Miroux ◽  
Haiwen Luo ◽  
Jilt Sietsma ◽  
Sybrand van der Zwaag
Keyword(s):  
Stress Relaxation ◽  
Stress Distribution ◽  
Strain Distribution ◽  
Local Stress ◽  
Stress Strain ◽  
Simple Modification ◽  
Single Grain ◽  
Grain Model ◽  
Mn Steel ◽  
Kinetics Of

The softening kinetics of a 0.19 wt% C 1.5 wt% Mn steel deformed at two intercritical temperatures have been characterised using the stress relaxation technique. Recrystallisation of intercritical austenite has been modelled using a single grain model (Chen et al., 2002 [1]), whilst recovery of both intercritical austenite and ferrite has been modelled using a model in the literature [Verdier et al., 1999 [2]). The models are combined to predict the overall softening kinetics with a rule of mixtures formulation. Comparison of the model with experiment shows significant deviations. The reasons are discussed with reference to the mixture rule and to the local stress-strain distribution which exists in the deformed samples. A simple modification to the model is proposed which takes into account the effect of a local stress distribution in deformed austenite.

Optimization of Orthotropic Laminates

1967 ◽  
Vol 89 (3) ◽  
pp. 399-402 ◽  
Author(s):  
L. Fischer
Keyword(s):  
Stress Distribution ◽  
Structural Design ◽  
Single Layer ◽  
Design Criteria ◽  
Shear Stresses ◽  
Stress Strain ◽  
Mathematical Procedure ◽  
Optimum Structural Design ◽  
Interaction Equation

Stress-strain relationships for a single layer are used to obtain the stress distribution in a laminate composed of any number of orthotropic layers subjected to axial and shear stresses. The mathematical procedure is simplified for an isotropic laminate. An interaction equation is presented to predict failure of a laminate. Optimum structural design criteria are obtained by considering different combinations of layer orientations.

Non-linear stress-strain behaviour of carbon fibre reinforced plastic laminates

1981 ◽  
Vol 16 (1) ◽  
pp. 43-51 ◽  
Author(s):  
A K Ditcher ◽  
F E Rhodes ◽  
J P H Webber
Keyword(s):  
Thermal Effects ◽  
Curing Temperature ◽  
Stress Strain ◽  
Plane Shear ◽  
Reinforced Plastic ◽  
Strain Behaviour ◽  
Non Linear ◽  
Theoretical Predictions ◽  
Linear Behaviour ◽  
Carbon Fibre Reinforced Plastic

An analytical method is proposed which predicts the non-linear stress-strain response of a CFRP laminate. The method uses a secant modulus iterative method and includes thermal effects due to the temperature difference of a laminate from its curing temperature. Details of the basic CFRP non-linear behaviour in transverse and in-plane shear loadings are given. Experimental data on 0°/±45°/0° balanced laminates are presented and compared with theoretical predictions.

scholarly journals Determination of the Actual Stress–Strain Diagram for Undermatching Welded Joint Using DIC and FEM

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4691
Author(s):  
Nenad Zoran Milošević ◽  
Aleksandar Stojan Sedmak ◽  
Gordana Miodrag Bakić ◽  
Vukić Lazić ◽  
Miloš Milošević ◽  
...  
Keyword(s):  
Stress Concentration ◽  
Welded Joint ◽  
Rectangular Cross Section ◽  
Image Correlation ◽  
Strain Diagram ◽  
Numerical Verification ◽  
Martensitic Steels ◽  
Stress Strain ◽  
3D Digital Image Correlation ◽  
Actual Stress

This paper presents new methodology for determining the actual stress–strain diagram based on analytical equations, in combination with numerical and experimental data. The first step was to use the 3D digital image correlation (DIC) to estimate true stress–strain diagram by replacing common analytical expression for contraction with measured values. Next step was to estimate the stress concentration by using a new methodology, based on recently introduced analytical expressions and numerical verification by the finite element method (FEM), to obtain actual stress–strain diagrams, as named in this paper. The essence of new methodology is to introduce stress concentration factor into the procedure of actual stress evaluation. New methodology is then applied to determine actual stress–strain diagrams for two undermatched welded joints with different rectangular cross-section and groove shapes, made of martensitic steels X10 CrMoVNb 9-1 and Armox 500T. Results indicated that new methodology is a general one, since it is not dependent on welded joint material and geometry.

scholarly journals Self-Excited Acoustical Measurement System for Rock Mass Stress Mapping

Sensors ◽  
2021 ◽  
Vol 21 (20) ◽  
pp. 6749
Author(s):  
Krzysztof Lalik ◽  
Ireneusz Dominik ◽  
Krzysztof Skrzypkowski ◽  
Waldemar Korzeniowski ◽  
Krzysztof Zagórski
Keyword(s):  
Rock Mass ◽  
Measurement System ◽  
The Self ◽  
Equivalent Model ◽  
Excited System ◽  
Mine Excavation ◽  
Stress Mapping ◽  
Preliminary Study ◽  
Two Degree Of Freedom ◽  
Actual Stress

This paper presents the results of a preliminary study of a self-excited acoustical system (SAS) for nondestructive testing (NDT). The SAS system was used for mine excavation stresses examination. The principle of operation of the SAS system based on the elastoacoustical effect is presented. A numerical analysis of the excavation was carried out considering the stress factor. An equivalent model based on a two-degree-of-freedom system with a delay has been developed. This model allowed to determine the relation which relates the frequency of the self-excited system to the stress level in the studied ceiling section. This relationship is defined by the elastoacoustic coefficient. The test details for anchorages in laboratory conditions and Wieliczka Salt Mine were presented. This research details of a method for creating actual stress maps in the ceiling of a mine excavation. The results confirmed the possibility of using the new measurement system to monitor the state of stresses in the rock mass.

scholarly journals Formation of the stress-strain state of rail bars during welding with preliminary vertical bending

2018 ◽  
Vol 230 ◽  
pp. 01015
Author(s):  
Volodymyr Shramenko ◽  
Nataliia Bielikova ◽  
Olexandr Ovchinnikov ◽  
Dmytro Onopreichuk ◽  
Stanislav Horielyshev
Keyword(s):  
Stress State ◽  
Temperature Stress ◽  
Working Conditions ◽  
Strain State ◽  
Weld Zone ◽  
Calculation Scheme ◽  
The Self ◽  
Stress Strain ◽  
Compressive Stresses ◽  
Residual Curvature

The article defines the parameters and working conditions for the final restoration of the integrity of the rail beams of a continuous gauge rail by electrocontact welding, as well as when welding rails with each other when they are elongated in the field by the method of preliminary bending. This involves the process of welding rails at temperatures above the temperature of their fixation. In this connection, an appropriate calculation scheme has been considered in relation to which the necessary parameters have been determined to ensure the conditions for straightening the residual curvature and, as a consequence, the formations of the corresponding stress state. To ensure the self-straightening conditions, the resulting formula for determining the residual bending arrow, the elimination of which under the influence of its own weight leads to the appearance of compressive stresses in the weld zone. In addition, a formula has been derived for determining the compressive stresses in the weld zone arising in the rail after the elimination of residual curvature. This means that when performing welding operations without forced straightening of the rails, you can restore not only their integrity, or weld them together. Thereby form a corresponding temperature-stress state.

ANALYSIS OF THE STRESS-STRAIN STATE OF A RIVET JOINT USING THE ABAQUS CAE SYSTEM

2020 ◽  
Vol 6 ◽  
pp. 51-57
Author(s):  
V.V. LEONTYEV
Keyword(s):  
Finite Element ◽  
Strain State ◽  
Three Dimensional ◽  
Element Model ◽  
Stress Strain ◽  
Stress Strain State ◽  
Riveted Joints ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Cae System

The method for analyzing of stress-strain state characteristics of unloaded riveted joints performed with OST 1 11781-74 rivets has been developed using Coupled Euler-Lagrange finite element approach implemented in the CAD / CAE system Abaqus. A comparative analysis of the stress-strain state characteristics of the examined riveted joint’s finite element models using the Lagrangian and the Coupled Lagrangian-Eulerian finite element approaches has been conducted. A three- dimensional finite element model based on the CLE method has been proposed for further study of fatigue strength and durability of the loaded riveted joints.

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