A Simple Method to Estimate Numerically the Residual Stresses in Bodies Subjected to Cyclic Loads

2018 ◽  
Vol 7 (4) ◽  
pp. 20170102
Author(s):  
Michał Pazdanowski
Keyword(s):  
Residual Stresses ◽  
Cyclic Loads ◽  
Simple Method

Residual Stress Redistribution Caused by Notches and Cracks in a Partially Autofrettaged Tube

1981 ◽  
Vol 103 (4) ◽  
pp. 302-306 ◽  
Author(s):  
S. L. Pu ◽  
M. A. Hussain
Keyword(s):  
Residual Stress ◽  
Stress Intensity ◽  
Residual Stresses ◽  
Stress Intensity Factors ◽  
Classical Method ◽  
Thermal Simulation ◽  
Intensity Factors ◽  
Crack Face ◽  
Simple Method ◽  
Crack Configuration

A simple method is provided for the computation of the redistribution of residual stresses and the stress intensity factors due to the introduction of notches and cracks in a partially autofrettaged tube. Numerical results of several crack and notch problems are obtained by the method of thermal simulation. These results are shown to be in excellent agreement with those obtained from the classical method of superposition. The new method based on thermal simulation is easier to apply and it avoids the alternate method of superposition requiring cumbersome distributed crack face loadings for each crack configuration.

Estimation of Stress Intensity Factors due To Welding Residual Stresses for Circumferentially Cracked Pipes

2012 ◽  
Author(s):  
Chang-Young Oh ◽  
Ji-Soo Kim ◽  
Yun-Jae Kim ◽  
Young-Jin Oh ◽  
Kyoungsoo Lee ◽  
...  
Keyword(s):  
Finite Element ◽  
Stress Intensity ◽  
Residual Stresses ◽  
Stress Intensity Factors ◽  
Finite Element Analyses ◽  
Intensity Factors ◽  
Crack Face ◽  
Simple Method ◽  
Weld Geometry ◽  
Nonlinear Stress

This paper proposes a simple method to estimate stress intensity factors due to welding residual stresses. In this study, finite element analyses for circumferentially cracked pipe are performed to calculate stress intensity factors. Four cracked geometries and two types of weld geometry are considered. KI-solutions for the nonlinear stress distribution on the crack face were determined in accordance with codes and standards. The results are compared with KI-solutions from finite element results. It is found that proposed simple method agrees well with FE results.

A Finite Element Method Study of Combined Hydraulic and Thermal Autofrettage Process

2017 ◽  
Vol 139 (4) ◽  
Author(s):  
Rajkumar Shufen ◽  
Uday S. Dixit
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Residual Stresses ◽  
Surface Temperature ◽  
Hydraulic Pressure ◽  
Simple Method ◽  
Inner Surface ◽  
Set Up ◽  
Element Method ◽  
Autofrettage Pressure

Autofrettage is a metal working process of inducing compressive residual stresses in the vicinity of the inner surface of a thick-walled cylindrical or spherical pressure vessel for increasing its pressure capacity, fatigue life, and stress-corrosion resistance. The hydraulic autofrettage is a class of autofrettage processes, in which the vessel is pressurized using high hydraulic pressure to cause the partial plastic deformation followed by unloading. Despite its popularity, the requirement of high pressure makes this process costly. On the other hand, the thermal autofrettage is a simple method, in which the residual stresses are set up by first maintaining a temperature difference across the thickness of the vessel and then cooling it to uniform temperature. However, the increase in the pressure carrying capacity in thermal autofrettage process is lesser than that in the hydraulic autofrettage. In the present work, a combined hydraulic and thermal autofrettage process of a thick-walled cylinder is studied using finite element method package ABAQUS® for aluminum and SS304 steel. The strain-hardening and Bauschinger effects are considered and found to play significant roles. The results show that the combined autofrettage can achieve desired increase in the pressure capacity of thick-walled cylinders with relatively small autofrettage pressure. For example, in a SS304 cylinder of wall-thickness ratio of 3, an autofrettage pressure of 150 MPa enhances the pressure capacity by 41%, but the same pressure with a 36 °C higher inner surface temperature than outer surface temperature can enhance the pressure capacity by 60%.

Relaxation of residual stresses caused by external cyclic loads on the basis of a kinetic approach

1985 ◽  
Vol 21 (1) ◽  
pp. 53-57
Author(s):  
A. P. Babichev ◽  
V. V. Sibirskii ◽  
S. N. Shevtsov
Keyword(s):  
Residual Stresses ◽  
Kinetic Approach ◽  
Cyclic Loads

Analytical evaluation of thermally induced residual stresses in ground components

2003 ◽  
Vol 217 (5) ◽  
pp. 471-482 ◽  
Author(s):  
D G Walsh ◽  
A A Torrance ◽  
J Tiberg
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Critical Temperature ◽  
Yield Strength ◽  
Residual Stresses ◽  
Material Properties ◽  
Analytical Evaluation ◽  
Simple Method ◽  
Thermally Induced

Although thermally induced tensile residual stresses have been known to occur in ground components, it has not been possible to predict the critical temperature at which these stresses begin to manifest themselves in the workpiece. In this paper, a model of the formation of thermally induced tensile residual stresses is proposed and a simple method of calculating the critical temperature above which tensile residual stresses occur is developed. The analysis makes use of dimensional methods to characterize the critical temperature. In addition, a formula characterizing the yield strength as a function of temperature was developed. The model was then validated using finite element techniques and some experimental data. The analysis reveals that it is possible to determine the critical temperature above which tensile residual stresses will be manifested based on readily available material properties. A case study illustrates the application of the technique.

Residual stresses in samples with a hole under the action of static and cyclic loads

1978 ◽  
Vol 10 (12) ◽  
pp. 1478-1480
Author(s):  
N. A. Vishnyakov ◽  
G. D. Gringauz ◽  
G. F. Rudzei
Keyword(s):  
Residual Stresses ◽  
Cyclic Loads ◽  
Static And Cyclic Loads

A method for the measurement of residual stresses using a fracture mechanics approach

1989 ◽  
Vol 24 (1) ◽  
pp. 23-30 ◽  
Author(s):  
K J Kang ◽  
J H Song ◽  
Y Y Earmme
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Stress Distribution ◽  
Fracture Mechanics ◽  
Residual Stresses ◽  
Residual Stress Distribution ◽  
The State ◽  
Two Dimensional ◽  
Finite Element Analyses ◽  
Simple Method

A simple method for measuring residual stresses in a plate is described. In this method residual stresses are evaluated using a fracture mechanics approach, that is, the strains or displacements measured at a point on the edge of a plate as a crack is introduced and extended from the edge are used to deduce the state of stresses that existed in the uncracked plate. Through finite element analyses and experiments this method is shown to be valid and effective for measuring the two-dimensional residual stress distribution of a welded plate.

Residual Stress Estimation and Shakedown Evaluation Using GLOSS Analysis

1994 ◽  
Vol 116 (3) ◽  
pp. 290-294 ◽  
Author(s):  
R. Seshadri
Keyword(s):  
Residual Stress ◽  
Stress Intensity ◽  
Residual Stresses ◽  
Internal Pressure ◽  
Assessment Method ◽  
Simple Method ◽  
Stress Estimation ◽  
Walled Cylinder

A simple method for estimating residual stresses using the GLOSS analysis is presented, and a shakedown assessment method is proposed. Practical pressure components exhibit some local elastic follow-up, and thereby induce smaller residual stresses than implied by uniaxial models. In this context, the effectiveness of “autofrettaging” is examined by studying a thick-walled cylinder subjected to an internal pressure. Modifications to the P + Q stress-intensity limit are suggested, and compared with Roche’s criterion. The method presented here is useful for configurations experiencing small to medium amounts of follow-up, which covers many practical situations.

A Simple Method for Estimation of Residual Stresses by Depth-Sensing Indentation

Strain ◽  
2011 ◽  
Vol 48 (1) ◽  
pp. 75-87 ◽  
Author(s):  
N. A. Sakharova ◽  
P. A. Prates ◽  
M. C. Oliveira ◽  
J. V. Fernandes ◽  
J. M. Antunes
Keyword(s):  
Residual Stresses ◽  
Depth Sensing ◽  
Simple Method

scholarly journals Modèle numérique pour l’étude des structures fissurées soumises à des contraintes résiduelles

2007 ◽  
pp. 627-642
Author(s):  
Zohra Gaiech ◽  
Hocine Kebir ◽  
Laurent Chambon ◽  
Jean-Marc Roelandt
Keyword(s):  
Residual Stress ◽  
Boundary Element Method ◽  
Stress Field ◽  
Residual Stresses ◽  
Specific Treatment ◽  
Cyclic Loads ◽  
Residual Stress Field ◽  
Principle Of Superposition ◽  
Compressive Stresses ◽  
Improve Fatigue

During their operational use the aeronautic structures can be submitted to relatively moderate cyclic loads and more rarely to stern loads. These last can generate residual stress field, which will influence the in-service behaviour. Otherwise, residual stress field can be created in a voluntary way by a specific treatment (compressive stresses). They permit to improve fatigue tolerance behaviour. This illustrates the importance of the study of the structure behavior under residual stresses, and the need to consider them in numerical simulations. The objective of this work is to develop a numerical method, based on the boundary element method and the principle of superposition, to assess the influence of residual stresses on fracture mechanics parameters.

Sign in / Sign up

Export Citation Format

Share Document