scholarly journals Residual Stress Analysis of an Orthotropic Composite Cylinder under Thermal Loading and Unloading

Symmetry ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 320 ◽  
Author(s):  
Somayeh Zarandi ◽  
Hsiang-Wei Lai ◽  
Yun-Che Wang ◽  
Sergey Aizikovich
Keyword(s):  
Residual Stress ◽  
Material Properties ◽  
Thermal Loading ◽  
Outer Boundary ◽  
Elastic Inclusion ◽  
Internal Stresses ◽  
Stress Distributions ◽  
Composite Cylinder ◽  
Temperature Dependent ◽  
Anisotropic Plasticity

Elastoplastic analysis of a composite cylinder, consisting of an isotropic elastic inclusion surrounded by orthotropic matrix, is conducted via numerical parametric studies for examining its residual stress under thermal cycles. The matrix is assumed to be elastically and plastically orthotropic, and all of its material properties are temperature-dependent (TD). The Hill’s anisotropic plasticity material model is adopted. The interface between the inclusion and matrix is perfectly bonded, and the outer boundary of the cylinder is fully constrained. A quasi-static, uniform temperature field is applied to the cylinder, which is analyzed under the plane-strain assumption. The mechanical responses of the composite cylinder are strongly affected by the material symmetry and temperature-dependent material properties. When the temperature-independent material properties are assumed, larger internal stresses at the loading phase are predicted. Furthermore, considering only yield stress being temperature dependent may be insufficient since other TD material parameters may also affect the stress distributions. In addition, plastic orthotropy inducing preferential yielding along certain directions leads to complex residual stress distributions when material properties are temperature-dependent.

FE Predictions of Temperature Distributions in a Multipass Welded Piping Branch Junction

2004 ◽  
Author(s):  
Wei Jiang ◽  
Kadda Yahiaoui ◽  
Chang J. Wang ◽  
Frank R. Hall ◽  
Tahar Laoui
Keyword(s):  
Residual Stress ◽  
Welding Process ◽  
Stress Distributions ◽  
Temperature Dependent ◽  
Material Microstructure ◽  
Temperature Distributions ◽  
Control Schemes ◽  
Complex Temperature ◽  
Walled Cylinder ◽  
Comprehensive Study

This contribution deals with the complex temperature profiles that are generated by the welding process in the intersection region of thick walled, cylinder-cylinder junctions. These affect material microstructure, mechanical properties and residual stresses. Knowledge of the thermal history and temperature distributions are thus critical in developing control schemes for acceptable residual stress distributions to improve in-service component behavior. A comprehensive study of 3D temperature distributions in a stainless steel tee branch junction during a multipass welding process is presented. A newly developed partitioning technique has been used to mesh the complex intersection areas of the welded junction. Various phenomena associated with welding, such as temperature dependent material properties, heat loss by convection and latent heat have been taken into consideration. The temperature distribution at various times after deposition of certain passes and the thermal cycles at various locations are reported. The results obtained in this study will be used for on-going and future analysis of residual stress distributions. The meshing technique and modeling method can also be applied to other curved, multipass welds in complex structures.

Crack Non-Circularity and Finite Erosion Effects on the 3D SIFs of a Bauschinger Modified Pressurized Thick-Walled Cylinder

2015 ◽  
Author(s):  
Qin Ma ◽  
Cesar Levy ◽  
Mordechai Perl
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Fatigue Life ◽  
Numerical Analysis ◽  
Material Properties ◽  
Thermal Loading ◽  
Circular Crack ◽  
Finite Element Package ◽  
Pressurized Cylinder ◽  
Walled Cylinder

Our previous studies have demonstrated that the 3D SIFs of a pressurized cylinder can be greatly affected by many factors. While an autofrettage process may introduce favorable residual stresses at the bore of the cylinder, other factors such as erosions and cracks, once introduced, may greatly reduce the effectiveness of the autofrettage results. In this study, we focus on how the non-circularity of cracks affects the 3D SIFs for a cylinder that contains finite erosions while keeping other conditions and material properties unchanged. Numerical analysis was performed using ANSYS, a standard commercially available finite element package. The residual stress due to any autofrettage process was simulated using the equivalent thermal loading. A closer look was given to problems with different crack configurations and how non-circularity of cracks affects the overall fatigue life of the cylinder when combined with other factors in comparison with circular crack only configurations.

Modelling of a Stud Arc Welding Joint for Temperature Field, Microstructure Evolution and Residual Stress

2016 ◽  
Author(s):  
Hadi Soltanzadeh ◽  
Jörg Hildebrand ◽  
Matthias Kraus ◽  
Mahyar Asadi
Keyword(s):  
Residual Stress ◽  
Material Properties ◽  
Main Concern ◽  
Temperature Dependent ◽  
Thermomechanical Model ◽  
Stress Calculation ◽  
Stud Welding ◽  
Microstructure Model ◽  
Transient Thermal ◽  
Welding Processes

This paper presents a modelling study and analysis performed on a stud welding including thermal, microstructure and stress calculation. The main concern of this work is toward controlling undesirable residual stresses and the evolution of material properties, as well as the chance of estimating cracks especially with regard to future services of structures. Historically, prediction of welding features is being pursued by welding engineers to enable them for optimal design and mitigation of adverse effects. Stud welding is among the welding processes that are not often addressed by means of modelling and associated activities to develop a comprehensive valid prediction. The aim of this research is to present a modelling practice for a stud weld joint to capture the transient thermal profile, consequent evolution of microstructural phase fractions, and stress calculation using a thermomechanical model based on FE methods (SYSWELD package). The material properties are fed into the model as temperature dependent. The microstructure model is based on t8/5 cooling trajectory on CCT diagram that captures transformation from Austenite phase, and the residual stress calculation is compared to experimental measurement for the sake of validation.

The Temperature and Residual Stress Distributions of Butt Weld Pass on Nickel Alloy 690 Plate

2013 ◽  
Vol 690-693 ◽  
pp. 2651-2654
Author(s):  
Chun Ho Yin ◽  
Chao Ming Hsu ◽  
Jao Hwa Kuang
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Nickel Alloy ◽  
Welding Parameters ◽  
Stress Distributions ◽  
Temperature Dependent ◽  
Element Analysis ◽  
Butt Weld ◽  
Alloy 690 ◽  
Solidification Processes

The variations of temperature profile and residual stress distribution in the single V butt welds were studied in this work. The thermal elastic-plastic model of ANSYS finite element analysis software is employed in this study to simulate the melting and solidification processes of two clamped nickel alloy 690 plates with different welding parameters; i.e. the welding speed and the number of weld passes. The temperature dependent material properties are used. The effects of these welding parameters on the residual stresses around the weld are investigated. Numerical results reveal that these welding parameters may affect the distribution of residual stresses significantly.

Thermoelastoplastic and Residual Stresses in a Hollow Cylinder With Temperature-Dependent Properties

1990 ◽  
Vol 112 (1) ◽  
pp. 85-91 ◽  
Author(s):  
S. Jahanian ◽  
M. Sabbaghian
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Numerical Procedure ◽  
Stress Distributions ◽  
Temperature Dependent ◽  
Exterior Surface ◽  
Negative Effect ◽  
Temperature Dependent Properties ◽  
Incremental Theory Of Plasticity

Determination of residual stresses and the positive or negative effect that they may have on the component is an important consideration in design. Unexpected failure of components, latter determined to be attributable to residual stress, is not uncommon. In this paper, a theoretical study of the stresses in a long hollow circular cylinder subjected to rapid cooling of the exterior surface is presented. A quasi-static uncoupled thermoelastoplastic analysis, based on incremental theory of plasticity, is developed and a numerical procedure for successive approximation is formulated. For this analysis, it is assumed that the material has temperature-dependent properties and is characterized by linear strain hardening. The thermoelastoplastic and residual stress distributions are discussed in detail. The results are compared with related published work where a reasonable agreement is observed.

Analytical Evaluation of Weld Residual Stress Distribution for BWR Pipings

2008 ◽  
Author(s):  
M. Ando ◽  
K. Nakata ◽  
R. Sumiya ◽  
M. Itow ◽  
N. Tanaka
Keyword(s):  
Heat Transfer ◽  
Residual Stress ◽  
Stainless Steel ◽  
Material Properties ◽  
Fem Analysis ◽  
Residual Stress Distribution ◽  
Temperature History ◽  
Stress Distributions ◽  
Weld Residual Stress ◽  
Stress Analyses

SCC (stress corrosion cracking) of low-carbon stainless steel piping has been found in Japanese BWR plants since 2002. According to JSME Fitness-for-Service Code, flaw evaluations are required to verify the life-time of piping if SCC is detected. In order to evaluate the SCC propagation behavior, it is necessary to obtain the residual stress distribution through the thickness of piping. In this study, the mock-up PLR (Primary Loop Recirculation system) piping weld joints made of L-grade Type 316 stainless steel with 300 mm and 600 mm diameter were fabricated and residual stress analyses were performed in order to obtain stress distributions. Material properties (specific heat, thermal conductivity, Young’s modulus, stress-strain curve, etc.) were obtained and temperature history during welding and weld residual stress were measured using these mock-ups. Material properties were used in the heat transfer and stress analyses. Measured temperature history and residual stress were compared with the results of heat transfer and stress analyses, respectively. Residual stress analysis of the pipe weld joint is commonly performed using axisymmetric element. In some cases of the combination of pipe diameter and thickness, residual stress obtained by the conventional method might differ from the experimental result owing to the difference of heating and constraint conditions between the axisymmetric model and the actual condition. In order to obtain more precise results, heat transfer and stress analyses were performed, taking into account the adjustment of the boundary condition in the weld passes of the last layer and the constraint condition using a spring element, respectively. On the outer and inner surfaces, almost the same residual stress distributions were obtained for the FEM analysis and the measurement. The residual stress distributions for PLR piping with different diameters, thicknesses, welding processes and groove angles were obtained by FEM analysis. Based on the results of the analyses, the influences of these parameters on residual stress were evaluated.

scholarly journals Thermoelastic problems of multilayered spherical pressure vessels subjected to axisymmetric loading

2020 ◽  
Vol 5 (3) ◽  
pp. 106-115
Author(s):  
Dávid Gönczi
Keyword(s):  
Material Properties ◽  
Thermal Loading ◽  
Spherical Body ◽  
Pressure Vessels ◽  
Functionally Graded ◽  
Radial Coordinate ◽  
Temperature Dependent ◽  
Graded Materials ◽  
Thermoelastic Problems ◽  
Spherical Pressure

This paper deals with the linear thermoelastic analysis of functionally graded multilayered spherical bodies subjected to constant mechanical and thermal loading. The temperature field is arbitrary function of the radial coordinate, the material properties and the radial body force vary according to power law functions along the radius of the sphere. An analytical method is presented to calculate the displacements and stresses within the multilayered spherical body. The method is expanded to tackle the problem of spherical bodies made from radially graded materials with temperature dependent material properties. The results are compared to finite element simulations and other methods.

Thermoelastoplastic Analysis of a Stainless Steel Plate Considering Phase Transformations

1993 ◽  
Vol 46 (11S) ◽  
pp. S12-S20 ◽  
Author(s):  
T. R. Tauchert ◽  
G. A. Webster ◽  
R. C. Reed
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Approximate Solution ◽  
Phase Transformations ◽  
Material Properties ◽  
Steel Plate ◽  
Phase Changes ◽  
Iterative Approach ◽  
Stress Distributions ◽  
Stainless Steel Plate

A quasistatic thermoelastoplastic analysis is given for the response of a traction-free plate subject to surface heating. The formulation incorporates temperature-induced phase changes which model experimentally obtained data for X22 CrMoV 12 1 stainless steel. The plate is discretized into layers, with material properties considered homogeneous within each layer. An incremental, iterative approach based upon Kirchhoff bending theory is employed to obtain an approximate solution to the problem. Numerical results illustrate the effects of phase transformations and temperature sensitivity of the material properties upon the transient and residual stress distributions.

Thermal Stresses in a ZrO2/FGM/Ti-6Al-4V Composite ECBC Plate with Temperature-Dependent Material Properties

2010 ◽  
Vol 150-151 ◽  
pp. 873-876
Author(s):  
Dai Hui Tu ◽  
Yang Jian Xu ◽  
Jian Hui Jia
Keyword(s):  
Thermal Stress ◽  
Compressive Stress ◽  
Material Properties ◽  
Composite Plate ◽  
Thermal Stresses ◽  
Ceramic Surface ◽  
Stress Distributions ◽  
Temperature Dependent ◽  
Maximum Compressive Stress ◽  
Gradient Layer

The steady thermal stress distributions and effect factors in a ZrO2/FGM/Ti-6Al-4V composite ECBC plate with temperature-dependent material properties under convective heat transfer boundary were investigated by the NFEM and the Sinpson method. From numerical calculation, when , T0=300K, Ta=350K and Tb=1 750K, the thermal stress distributions in the composite FGM plate were obtained. The results are as follows. With the increase of the FGM gradient layer thickness and when M=1, the temperature distributions in the composite plate are more reasonable. With the increase of the FGM gradient layer M, the thermal stresses on the ceramic surface tend toward reduction, and compared with the thermal stress of M=0.2, the thermal stress of M =5 reduces by 17.8%. When we take into account the effect of temperature-dependent material properties, compared with the results of constant material properties, the maximum compressive stress on the surface of metal reduces by 74.2%, and the maximum compressive stress on the surface of ceramics reduces by 45.3%. With the increase of FGM layer porosity P, the change of stress at the bonding interface of the three-layered plate increases, and the stress curves appear peak values. Compared with A=0, when A=3.99, the compressive thermal stress on the metal surface reduces by 42.0%, and the compressive thermal stress on the ceramic surface increases by 154.7%. Compared with the nongraded two-layered ceramic/metal composite plate, the thermal stress of the ZrO2/FGM/ Ti-6Al-4V composite plate is very gentle. Compared with , when , the maximum compressive stress on the surface of metal reduces by 49.98%, and the maximum compressive stress on the surface of ceramics increases by 182.3%. The results provide the foundations of theoretical calculation for the design and application of the composite plate.

Compressive Thermal Yielding Leading to Hydrogen Cracking in a Fired Cannon

1999 ◽  
Vol 121 (1) ◽  
pp. 116-120 ◽  
Author(s):  
J. H. Underwood ◽  
A. P. Parker ◽  
P. J. Cote ◽  
S. Sopok
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Thermal Loading ◽  
Convective Heat Transfer Coefficient ◽  
Protective Layer ◽  
Maximum Temperature ◽  
Firing Cycle ◽  
Stress Distributions ◽  
Hydrogen Cracking ◽  
Combustion Gas

Investigation of environmental cracking of a 1100-MPa yield strength A723 steel cannon tube subjected to prototype firings is described. Metallographic results show cracking of the steel beneath a 0.12-mm protective layer of chromium. Cracks undermine and remove sections of chromium and lead to localized erosion that ruins the cannon. Key features of the firing thermal damage and cracking are: (i) recrystalization of the chromium to a depth of up to 0.08 mm; (ii) steel transformation to 0.19 mm below the chrome surface; (iii) two different periodic arrays of cracks normal to the hoop and axial directions, with mean depths of 0.23 and 0.46 mm, respectively. Time-temperature-depth profiles for the firing cycle were derived via bi-material finite difference analysis of a semi-infinite solid which incorporated cannon combustion gas temperatures and material properties that vary as a function of temperature. The temperature and depth associated with the steel transformation were used to solve iteratively for the convective heat transfer coefficient. This value was further confirmed by the depths of chromium recrystalization and of the crack arrays in the two orientations. A profile of maximum temperature versus depth is used to determine the near-bore applied and residual stress distributions within the tube. The measured volume change of steel transformation is used to determine an upper limit on applied and residual stresses. These stresses are used to determine crack-tip stress intensity factors for the observed crack arrays, and hence provide some explanation for the differential depths of cracking. The near-bore temperature and residual stress distributions are used to help determine the cause of hydrogen cracking and measures to prevent cracking. Compressive yielding due to thermal loading produces near-bore tensile residual stresses, and thereby causes hydrogen cracking. Prevention of cracking is discussed in relationship to hydrogen crack growth rate tests of alternative alloys and coatings.

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