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fracture behavior of straight pipe and elbow with local

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Ultra Silent - Huliot advanced flow systems

An alternative possibility is to use two sleeves and plain pipe (the minimum plain pipe length must be more than double that of the external pipe diameter DN,as in Figure 5 To fx punctured or damaged pipe,the same methods can apply with one socket pipe (USEM) instead of the branch and for adding inspection pipe (USRE) or double branch (USDA).Toshiyuki MESHII Professor (Full) PhD University of Necessity of considering internal pressure in evaluating the bending capacity of straight pipes with axially short local wall-thinning Fracture toughness in the transition temperature J_c has The Battelle Integrity ofsuch as pipe system boundary conditions,and weld residual stresses on the behavior of flawed pipes.Many of these analyses involved the use of finite element modeling techniques.One of these analytical tasks was to examine the actual margins that may exist in flawed pipe evaluations as a result of non-linear behavior.While the magnitude of these

Temperature- and time-dependent behavior of Z2CN18.10

Oct 23,2020 fracture behavior of straight pipe and elbow with local#0183;A series of uniaxial monotonic tensile tests were first conducted on the piping specimens of Z2CN18.10 stainless steel within the temperature range from 20 fracture behavior of straight pipe and elbow with local#176;C to 350 fracture behavior of straight pipe and elbow with local#176;C at different strain rates.The results show an interesting characteristic of the material it exhibited obvious rate-dependence at room temperature,whereas at 350 fracture behavior of straight pipe and elbow with local#176;C no such significant dependence was observed.Temperature- and time-dependent behavior of Z2CN18.10 Oct 23,2020 fracture behavior of straight pipe and elbow with local#0183;A series of uniaxial monotonic tensile tests were first conducted on the piping specimens of Z2CN18.10 stainless steel within the temperature range from 20 fracture behavior of straight pipe and elbow with local#176;C to 350 fracture behavior of straight pipe and elbow with local#176;C at different strain rates.The results show an interesting characteristic of the material it exhibited obvious rate-dependence at room temperature,whereas at 350 fracture behavior of straight pipe and elbow with local#176;C no such significant dependence was observed.TEMPERATURE PARAMETER EFFECT ON THE FRACTUREmodeling the fracture behavior of structures in any sector is a great interest,especially in the case of structures on polymer containing a defect.The fracture behavior of structure is analyzed by the analysis of field stress and strain at the near in the geometric discontinuity.For this,we used the finite element code CASTEM developed

Structural behavior of buried pipe bends and their effect

May 15,2017 fracture behavior of straight pipe and elbow with local#0183;Pipe bends,often referred to as elbows,are special pipeline components,widely used in onshore buried steel pipelines.They are sensitive to imposed deformations and their structural behavior is quite flexible and associated with the development of significant stress and strain,which may lead to failure.In the present paper,the mechanical performance of buried steel pipeline bends Structural behavior of buried pipe bends and their effect May 15,2017 fracture behavior of straight pipe and elbow with local#0183;Pipe bends,often referred to as elbows,are special pipeline components,widely used in onshore buried steel pipelines.They are sensitive to imposed deformations and their structural behavior is quite flexible and associated with the development of significant stress and strain,which may lead to failure.In the present paper,the mechanical performance of buried steel pipeline bends Some results are removed in response to a notice of local law requirement.For more information,please see here.Previous123456NextFAILURE BEHAVIOR OF PIPING SYSTEMS WITH LOCALPipe element tests for straight pipes Straight pipes and bend pipes (elbows) were used for the pipe element tests.Straight pipe element tests were the cyclic four-point bending tests on the pipes with degradation.The degradation conditions considered in the tests were either of local wall thinning (modeled by mechanical machining),electric

Some results are removed in response to a notice of local law requirement.For more information,please see here.Predicting the limit pressure capacity of pipe elbows

Oct 01,2015 fracture behavior of straight pipe and elbow with local#0183;In a thin,straight and intact pipe the stress distribution is uniform both in longitudinal and circumferential directions,but in an intact elbow as the bend radius decreases the circumferential stress at the intrados increases and at the extrados decreases.This makes elbow as the weakest part of a piping system.LARGE DEFORMATION BEHAVIOR OF LOW-ANGLEPipe thickness,t (mm) 5.4 6.8 7.4 Elbow Do/t 21 32 43 Straight pipe Wall thickness,t (mm) 4.1 5.2 6.5 Figure 1 illustrates the experimental setup.Straight pipes with lengths of about 2.5 times the diameter for 200-mm and 300-mm-diameter pipes and 5 times the diameter for 100-mm-diameter pipes were welded to each end of the test elbows.

Koji Takahashi - Google Scholar

Fatigue and Fracture of Engineering Materials and Structures 21 (12),1473-1484,1998.83 Low cycle fatigue behaviors of elbow pipe with local wall thinning. Failure behavior of carbon steel pipe with local wall thinning near orifice.K Takahashi,K Ando,M Hisatsune,K Hasegawa International Piping Integrity Research Group (IPIRG Large-scale,quasi-static and dynamic,pipe-system,elbow fracture experiments under combined pressure and bending loads were performed on elbows containing an internal surface crack at the extrados.In conjunction with the elbow experiments,material property data were developed for the more A106-90 carbon steel and WP304L stainless steel Hydroforming Process for an Ultrasmall Bending Radius ElbowBent pipes and elbows are common components found in piping systems for their flexibility compared to straight pipes .Tube NC bending is the major process to manufacture bent pipes,but it is too hard to obtain an elbow with relative bending radius less than 1.0 with this method [ 2 ],even with local

Hydroforming Process for an Ultrasmall Bending Radius Elbow

Bent pipes and elbows are common components found in piping systems for their flexibility compared to straight pipes .Tube NC bending is the major process to manufacture bent pipes,but it is too hard to obtain an elbow with relative bending radius less than 1.0 with this method [ 2 ],even with localFracture behavior of straight pipe and elbow with local Feb 01,2002 fracture behavior of straight pipe and elbow with local#0183;Then we studied the fracture behavior of straight pipe and elbow with local wall thinning.For the straight pipe,failure mode,limit load and allowable wall thinning limit based on plastic deformation ability have been studied systematically.Twenty two straight pipe specimens were tested.Fluid Flow in T-Junction of PipesT-junction of pipes with various inlet velocities,head loss in T-junction of pipes when the angle of the junction is slightly different from 90 degrees and T-junction with different area of cross-section of the main pipe and branch pipe.In this work we have simulated the ow at T-junction of pipe

Fatigue crack propagation behaviour of pressurised elbow

Sep 01,2020 fracture behavior of straight pipe and elbow with local#0183;Fatigue crack propagation behaviors of Z2CND18.12 N pressurised elbow pipes were studied. The aspect ratios of crack increment, (2 c) / a versus the number of cycles at intrados and crown are linear.The relation of crack depth growth rate and J-integral range conforms to Paris law both at intrados and crown.Fatigue crack propagation analysis of surface cracks in Apr 01,2008 fracture behavior of straight pipe and elbow with local#0183;Fig.2 shows the overall elbow model of specimen 1 using shell elements.The stress results from the FEM models indicated that the maximum stress occurs on the outer surface,at 45 fracture behavior of straight pipe and elbow with local#176; along the bend and around 6.8 fracture behavior of straight pipe and elbow with local#176; (specimen 1) and 8 fracture behavior of straight pipe and elbow with local#176; (specimen 2) from the crown (towards the center of the bend in the elbow) along the circumferential direction of the pipe.Fatigue Crack Growth Behavior in Pipes and Elbows of Jan 01,2013 fracture behavior of straight pipe and elbow with local#0183;Full scale pipe,pipe weld and elbow test Fatigue crack growth tests on pipes and pipe welds have been carried out under constant amplitude sinusoidal cyclic loading.The schematic of four point bend test set up for straight pipes and pipe welds has been shown in Fig.1(a).The test set up for elbow has been shown in Fig.1(b).

Experimental Investigation on Corrosion Effect on

Little research has been undertaken on the effect of corrosion on mechanical property change of pipe materials,and almost no research has been conducted on corrosion effect on fracture toughness of pipe materials.As is well known,it is the mechanical properties of the pipe materials that govern the behavior and eventual failure of the pipes.Experiment #4 Energy Loss in Pipes Applied Fluid Experiment #4 Energy Loss in Pipes 1.Introduction.The total energy loss in a pipe system is the sum of the major and minor losses.Major losses are associated with frictional energy loss that is caused by the viscous effects of the fluid and roughness of the pipe wall.Effect of Open Crack on Vibration Behavior of a Fluid The local flexibility of the structure is reduced due to the crack and this concept has been used to model the vibration behavior of the cracked pipe in some studies (Xie 1998,Mahjoob and Shahsavari 2007,Hu et al.2011,Yumin et al.2011,liu et al.2012,Bai et al.2013).Literature review indicates that available studies about the vibration

Effect of Ground Motions on Nonlinear Seismic Behavior of

Recent earthquakes have damaged many lifeline structures.Buried gas pipelines are also no exceptions.Sometimes,theses pipes are subjected to a thinning of the wall thickness due to corrosion.Therefore,it is important to evaluate the strength of the pipes undergoing local wall thinning to maintain the integrity of the piping systems.The main purpose of this study is to understand failure Effect of Ground Motions on Nonlinear Seismic Behavior of Recent earthquakes have damaged many lifeline structures.Buried gas pipelines are also no exceptions.Sometimes,theses pipes are subjected to a thinning of the wall thickness due to corrosion.Therefore,it is important to evaluate the strength of the pipes undergoing local wall thinning to maintain the integrity of the piping systems.The main purpose of this study is to understand failure EFFECT OF LOCAL WALL THINNING ON FRACTURE BEHAVIORLocal wall thinning was machined on the pipes in order to simulate erosion/corrosion metal loss.The configurations of the eroded area included an eroded ratio of d/t = 0.2,0.5,0.6,and 0.8,and an eroded length of l = 10 mm,25 mm,and 120 mm.Fracture type could be classified into ovalization,local buckling,and crack initiation depending

EFFECT OF LOCAL WALL THINNING ON FRACTURE BEHAVIOR

Local wall thinning was machined on the pipes in order to simulate erosion/corrosion metal loss.The configurations of the eroded area included an eroded ratio of d/t = 0.2,0.5,0.6,and 0.8,and an eroded length of l = 10 mm,25 mm,and 120 mm.Fracture type could be classified into ovalization,local buckling,and crack initiation depending Cited by 87Publish Year 2002Author Seok-Hwan Ahn,Ki-Woo Nam,Yeon-Sik Yoo,Kotoji Ando,Su-Hwan Ji,Masayuki Ishiwata,Kunio Hasegawa Fracture behavior of carbon steel pipe with local DOI 10.1016/S0029-5493(99)00141-7 Corpus ID 59067814.Fracture behavior of carbon steel pipe with local wall thinning subjected to bending load @article{Miyazaki1999FractureBO,title={Fracture behavior of carbon steel pipe with local wall thinning subjected to bending load},author={K.Miyazaki and S.Kanno and Masayuki Ishiwata and K.Hasegawa and S.Ahn and K.Ando},journal={Nuclear Cited by 11Publish Year 2017Author Polynikis Vazouras,Spyros A.Karamanos,Spyros A.Karamanos Experimental study of low-cycle fatigue of pipe Low-cycle fatigue tests were conducted using elbow specimens with local wall thinning.Local wall thinning was machined on the inside of the elbow in order to simulate metal loss from erosion corrosion.The local wall thinning was located in three different areas known as the extrados,crown and intrados.The elbow specimens were subjected to cyclic in-plane bending under displacement control

Characteristics of Strength and Deformation of Inner/Outer

Fracture behaviors of pipes with local wall thinning are very important for the integrity of power plant piping system.In this study,monotonic bending tests without internal pressure are Chapter 1 Tension,Compression,and ShearAf final area at fracture section for ductile steel,RA j 50% For material have small fracture strain,it is classified as brittle material,such as concrete,cast iron,rock,glass,etc.B fracture stress,same as ultimate stress Stress-Strain diagram in compression have different shapes from thoseCFD Analysis of Two-Phase Flow Characteristics in a 90 shown in Figure 1.Distance between each location in the straight pipe sections is 50.8mm or four times the pipe diameter.Location 3 and 4 are at the inlet and outlet of the elbow.Three upstream and three downstream locations were used in the analysis of the results.Figure 1.Elbow Geometry with Straight Pipe Sections Used in the Analysis

CFD Analysis of Two-Phase Flow Characteristics in a 90

shown in Figure 1.Distance between each location in the straight pipe sections is 50.8mm or four times the pipe diameter.Location 3 and 4 are at the inlet and outlet of the elbow.Three upstream and three downstream locations were used in the analysis of the results.Figure 1.Elbow Geometry with Straight Pipe Sections Used in the AnalysisASTM International - Journal of Composites,Technology and Fracture Behavior of a Fiber-Reinforced Titanium Matrix Composite with Open and Filled Holes at Room and Elevated Temperatures. Effect on Local Stress Fields. Straight Free-Edge Stresses Determined by Two- to Three-Dimensional Global/Local Finite Element Analysis.ASTM International - Journal of Composites,Technology and Fracture Behavior of a Fiber-Reinforced Titanium Matrix Composite with Open and Filled Holes at Room and Elevated Temperatures. Effect on Local Stress Fields. Straight Free-Edge Stresses Determined by Two- to Three-Dimensional Global/Local Finite Element Analysis.

A Study on Experimental Evaluation for Fracture Behavior

This study was carried out an experimental and finite element analysis on the fracture behavior of straight pipes with local wall thinning under internal pressure.2.1.1 Nonlinear dynamic analysis of a structure with local In pipes with thin walls (20) it is to be expected that the behavior will be affected strongly by internal fluid pressure in the pipe and by the interaction between axial and bending forces.Such thin-walled pipes could be modeled at relatively low cost by using ELBOW elements directly in the dynamic analysis instead of this two-stage approach.12345NextLARGE DEFORMATION BEHAVIOR OF LOW-ANGLEPipe thickness,t (mm) 5.4 6.8 7.4 Elbow Do/t 21 32 43 Straight pipe Wall thickness,t (mm) 4.1 5.2 6.5 Figure 1 illustrates the experimental setup.Straight pipes with lengths of about 2.5 times the diameter for 200-mm and 300-mm-diameter pipes and 5 times the diameter for 100-mm-diameter pipes were welded to each end of the test elbows.

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