A 3D FEA Model with Plastic Shots for Evaluation of Peening Residual Stress due to Multi-Impacts

2008 ◽  
Vol 32 (8) ◽  
pp. 642-653 ◽  
Author(s):  
Tae-Hyung Kim ◽  
Hyungy-Il Lee
Keyword(s):  
Residual Stress ◽  
Fea Model ◽  
3D Fea

Effect of Residual Stress or Plastic Deformation History on Fatigue Life Simulation of Pipeline Dents

2018 ◽  
Author(s):  
Xian-Kui Zhu ◽  
Rick Wang
Keyword(s):  
Residual Stress ◽  
Plastic Deformation ◽  
Fatigue Life ◽  
Residual Stresses ◽  
Three Dimensional ◽  
Strain History ◽  
Deformation History ◽  
Stress Strain ◽  
Element Analysis ◽  
Fea Model

Mechanical dents often occur in transmission pipelines, and are recognized as one of major threats to pipeline integrity because of the potential fatigue failure due to cyclic pressures. With matured in-line-inspection (ILI) technology, mechanical dents can be identified from the ILI runs. Based on ILI measured dent profiles, finite element analysis (FEA) is commonly used to simulate stresses and strains in a dent, and to predict fatigue life of the dented pipeline. However, the dent profile defined by ILI data is a purely geometric shape without residual stresses nor plastic deformation history, and is different from its actual dent that contains residual stresses/strains due to dent creation and re-rounding. As a result, the FEA results of an ILI dent may not represent those of the actual dent, and may lead to inaccurate or incorrect results. To investigate the effect of residual stress or plastic deformation history on mechanics responses and fatigue life of an actual dent, three dent models are considered in this paper: (a) a true dent with residual stresses and dent formation history, (b) a purely geometric dent having the true dent profile with all stress/strain history removed from it, and (c) a purely geometric dent having an ILI defined dent profile with all stress/strain history removed from it. Using a three-dimensional FEA model, those three dents are simulated in the elastic-plastic conditions. The FEA results showed that the two geometric dents determine significantly different stresses and strains in comparison to those in the true dent, and overpredict the fatigue life or burst pressure of the true dent. On this basis, suggestions are made on how to use the ILI data to predict the dent fatigue life.

Finite Element Analysis Model of Corrosion Fatigue for TIG Welding Workpiece

2016 ◽  
Vol 707 ◽  
pp. 154-158
Author(s):  
Somsak Limwongsakorn ◽  
Wasawat Nakkiew ◽  
Adirek Baisukhan
Keyword(s):  
Residual Stress ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Life ◽  
Corrosion Fatigue ◽  
Welding Process ◽  
Simulation Software ◽  
Tig Welding ◽  
Element Analysis ◽  
Fea Model

The proposed finite element analysis (FEA) model was constructed using FEA simulation software, ANSYS program, for determining effects of corrosion fatigue (CF) from TIG welding process on AISI 304 stainless steel workpiece. The FEA model of TIG welding process was developed from Goldak's double ellipsoid moving heat source. In this paper, the residual stress results obtained from the FEA model were consistent with results from the X-ray diffraction (XRD) method. The residual stress was further used as an input in the next step of corrosion fatigue analysis. The predictive CF life result obtained from the FEA CF model were consistent with the value obtained from stress-life curve (S-N curve) from the reference literaturature. Therefore, the proposed FEA of CF model was then used for predicting the corrosion fatigue life on TIG welding workpiece, the results from the model showed the corrosion fatigue life of 1,794 cycles with testing condition of the frequency ( f ) = 0.1 Hz and the equivalent load of 67.5 kN (equal to 150 MPa) with R = 0.25.

Experimental and Analytical Leak Characterization for Axial Through-Wall Cracks in a Liquids Pipeline

2014 ◽  
Author(s):  
Mohamed R. Chebaro ◽  
Nader Yoosef-Ghodsi ◽  
David M. Norfleet ◽  
Jason H. Bergman ◽  
Aaron C. Sutton
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Internal Pressure ◽  
Crack Opening ◽  
Full Scale ◽  
Leak Rate ◽  
Propagation Mechanism ◽  
Element Analysis ◽  
Fea Model ◽  
Experimental Findings

Three pipeline sections containing defects of interest were non-destructively tested in the field, cut out and shipped to a structural laboratory to undergo full-scale testing. The common objectives of the experiments were to determine (1) the leak initiation pressure and (2) the leak rate at various specified internal pressures. While two spools (Specimens A and B) contained through-wall cracks, the third (Specimen C) had a partial through-wall crack with similar characteristics. The capacity of through-wall defects to withstand a level of internal pressure without leaking is due to the resultant local, compressive hoop residual stresses. Specimen C underwent full-scale pressure cycling to further comprehend the crack propagation mechanism in order to correlate it to field operation and analytical fatigue life predictions. To enhance the understanding of the physical crack behaviour as a function of internal pressure, a comprehensive finite element analysis (FEA) model was built using SIMULIA’s Abaqus software. The model inputs incorporated results from the above-mentioned laboratory tests, in addition to extensive radial, circumferential and axial residual stress measurements using the X-ray diffraction (XRD) technique, obtained on three pipe spools cut out from the same line. The resulting crack opening parameters from FEA were input into a closed-form fluid mechanics (FM) model, which was calibrated against a computational fluid dynamics (CFD) model, to determine the corresponding leak initiation pressures and leak rates. These outcomes were then compared to experimental findings. The FEA and FM models were subsequently employed to carry out a parametric study for plausible combinations of feature geometries, material properties, operational pressures and residual stresses to replicate field conditions. The key outcome from this study is the experimental and analytical demonstration that, for given fluid properties and pressures, the leak threshold and leak rate for through-wall cracks are primarily dependent upon the crack geometry and local residual stress distributions.

Linear Statics Analysis of the Connecting Rod of a Certain Type of Continuous Mill with Mechanics Properties

2012 ◽  
Vol 252 ◽  
pp. 98-101
Author(s):  
Chang Ping Zou ◽  
Xiao Feng Zhang ◽  
De Rong Cheng ◽  
Xu Zhi Lu
Keyword(s):  
Large Scale ◽  
Integrated Design ◽  
Continuous Mill ◽  
Connecting Rod ◽  
Analysis Software ◽  
Element Analysis ◽  
Fea Model ◽  
3D Fea ◽  
Set Up ◽  
3D Solid

The connecting rod of a certain type of continuous mill early produces crackle,cannot work,hindering the production.The authors are entrusted with the 3D Finite Element Analysis (FEA) of the connecting rod.On SUN workstation,utilizing the large scale Integrated-Design Engineering Analysis Software,I-DEAS,the authors have constructed accurate 3D solid model of the connecting rod,set up effective 3D FEA model,found the solution of several kinds of law of stress distribution and deformation,reached valuable conclusions.

The Optimization Design of Dental Implant after the Mandible Tumor Resection and Reconstruction

2013 ◽  
Vol 702 ◽  
pp. 318-322
Author(s):  
Wen Zheng Wu ◽  
Ji Zhao ◽  
Lei Zhang ◽  
Xing Tian Qu ◽  
Di Zhao ◽  
...  
Keyword(s):  
Optimization Design ◽  
Tumor Resection ◽  
Biomechanical Analysis ◽  
Secondary Surgery ◽  
Element Analysis ◽  
Fea Model ◽  
3D Fea ◽  
Mandible Defect ◽  
Operation Cost

Mandible defect and the lack of dentition may result in facial deformity and chewing organ defects. It happens after the surgery of oral and maxillofacial tumors. This study aims at this problem. In this study, Finite Element Analysis (FEA) was employed to reconstruct the implanted mandible for customized patient. The 3D FEA model has great importance for biomechanical analysis. Though the analysis of the biomechanical situation with different numbers of dental implants, we can optimize the location and quantity of the implants. In this way, we can improve the quality of the implants, reduce the pain of patients, reduce the operation cost and avoid secondary surgery.

Residual Stress Predictive Model of TIG Welding Process Using Finite Element Analysis

2015 ◽  
Vol 799-800 ◽  
pp. 428-433 ◽  
Author(s):  
Somsak Limwongsakorn ◽  
Wasawat Nakkiew ◽  
Adirek Baisukhan
Keyword(s):  
Residual Stress ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Welding Speed ◽  
Compressive Residual Stress ◽  
Welding Process ◽  
Element Analysis ◽  
Arc Voltage ◽  
Fea Model ◽  
Arc Current

Residual stress occured in welding process generally causes reduction in the strength of welded joints, shortens the fatigue life, and brings about the distortion of the workpiece. In this research, finite element analysis (FEA) model of the butt-joint tungsten inert gas (TIG) welding process with the application of birth-death technique was presented. The material used in this research was AISI 304 stainless steel. The FEA model was constructed on a simulation software, ANSYS. The predictive residual stress from a welding condition obtained from the FEA model was verified by the value measured from X-ray diffraction (XRD) machine. Effects of four welding process parameters: efficiency, welding speed, arc current, and arc voltage on residual stress at the center of the welded joint and at the heated affected zone (HAZ) were investigated. The welding conditions were generated by varying these four main effects according to the Taguchi design of experiment technique (L8 orthogonal array). In general, compressive residual stress is beneficial to the strength and fatigue life of welded joints. For the Taguchi method the larger is better constraint was used; larger means higher magnitude of compressive residual stress. The predictive residual stress results obtained from the FEA model were consistent with the values obtained from the XRD measurement. The result suggested that the most significant effect was the arc current, followed by the arc voltage, welding speed, and the efficiency. The response optimizer in MINITAB software showed the optimal magnitude of compressive residual stress values of about 52 MPa obtained at the arc current of 126 Ampere, arc voltage of 17 Volts, welding speed of 110 mm/min, and the efficiency of 80%.

scholarly journals Finite Elements Analysis of the Temporomandibular Joint Disc in Patients with Intra-articular Disorders

2020 ◽  
Author(s):  
Linfeng Lai ◽  
Guofeng Xiong ◽  
Chenyao Huang ◽  
Fan Zhou ◽  
Fujian Xia
Keyword(s):  
Friction Coefficient ◽  
Finite Elements ◽  
Stress Distribution ◽  
Temporomandibular Joint ◽  
Finite Elements Analysis ◽  
Temporomandibular Joint Disc ◽  
Fea Model ◽  
Tmj Disc ◽  
Joint Disorder ◽  
3D Fea

Abstract Background： Anterior and/or medial displacement of the temporomandibular joint disorder(TMJ) disc or intra-articular disorders( ID) is the most common form of TMJ dysfunction(TMD).TMD cause change of friction coefficient during TMJ movement. In the present study, We provided a 3D finite elements models(FEM) including the maxilla, disc and mandible and evaluated the stress distribution with different friction coefficient. Methods: 14 volunteers without TMD and 20 TMD patients,who were diagnosed by MRI, were selected.CT and MRI data were collected to build 3D FEA model of mandibular and TMJ disc.Stress distribution with different friction coefficient was measured. Result: In the normal model, stress distribution on TMJ disc was 2.07±0.17,1.49±0.14,1.41±0.14MPa with 0.001 0.3 and 0.4 friction coefficient.In TMD model,stress distribution is 3.87±0.15,7.23±0.22,7.77±0.19MPa respectively. Conclusion: When the friction coefficient of the side with anterior displacement increased, stress on the disc, condyle and mandible of the opposite side increased. Simultaneously, stress values of the disc, condyle and mandible were higher than those of the normal lateral joint.

scholarly journals Finite Elements Analysis of the Temporomandibular Joint Disc in Patients with Intra-articular Disorders

2020 ◽  
Author(s):  
Linfeng Lai ◽  
Guofeng Xiong ◽  
Chenyao Huang ◽  
Fan Zhou ◽  
Fujian Xia
Keyword(s):  
Friction Coefficient ◽  
Finite Elements ◽  
Stress Distribution ◽  
Temporomandibular Joint ◽  
Finite Elements Analysis ◽  
Temporomandibular Joint Disc ◽  
Fea Model ◽  
Tmj Disc ◽  
Joint Disorder ◽  
3D Fea

Abstract Background：Anterior and/or medial displacement of the temporomandibular joint disorder(TMJ) disc or intra-articular disorders( ID) is the most common form of TMJ dysfunction(TMD).TMD cause change of friction coefficient during TMJ movement. In the present study, We provided a 3D finite elements models(FEM) including the maxilla, disc and mandible and evaluated the stress distribution with different friction coefficient.Methods: 14 volunteers without TMD and 20 TMD patients,who were diagnosed by MRI, were selected.CT and MRI data were collected to build 3D FEA model of mandibular and TMJ disc.Stress distribution with different friction coefficient was measured.Result: In the normal model, stress distribution on TMJ disc was 2.07±0.17,1.49±0.14,1.41±0.14MPa with 0.001 0.3 and 0.4 friction coefficient.In TMD model,stress distribution is 3.87±0.15,7.23±0.22,7.77±0.19MPa respectively. Conclusion:When the friction coefficient of the side with anterior displacement increased, stress on the disc, condyle and mandible of the opposite side increased. Simultaneously, stress values of the disc, condyle and mandible were higher than those of the normal lateral joint.

scholarly journals 3-D digital modeling and bio-mechanics research of the anterior disk displacement without reduction temporomandibular joint system

2019 ◽  
Author(s):  
Linfeng Lai ◽  
Guofeng Xiong ◽  
Chenyao Huang ◽  
Fan Zhou ◽  
Fujian Xia
Keyword(s):  
Maximum Stress ◽  
Lateral Part ◽  
Articular Disc ◽  
Finite Elements Analysis ◽  
Joint System ◽  
Data Registration ◽  
Fea Model ◽  
3D Data ◽  
Digital Modeling ◽  
3D Fea

Abstract Background： Anterior and/or medial displacement of the articular disc or intra-articular disorders( ID) is the most common form of TMJ dysfunction.In the present study,3D finite elements analysis (FEA) models including the maxilla, disc and mandible were established using 3D data registration technology. Materials and Methods： Six healthy volunteers and 20 TMD patients were selected.CT and MRI data were collected to build 3D FEA model of mandibular and TMJ disc. Result: Results showed that maximum stress of the normal lateral articular disc in the normal and pathological models appeared in the lateral part of the middle band. In the normal model, stress distribution was more uniform and the joint disc and the condyle were also subjected to higher load at the junction of the articular disc and the condyle. Conclusion: When the friction coefficient of the side with anterior displacement increased, stress on the disc, condyle and mandible of the opposite side increased. Simultaneously, stress values of the disc, condyle and mandible were cd32fvhigher than those of the normal lateral joint.

Sign in / Sign up

Export Citation Format

Share Document