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(PDF) A closed-form solution for lateral indentation of theoretical analysis of local indentation on pressured pipes

The work described in this paper forms part of a closed analytical solution for the quasi-static response of flexibly supported pressurized pipes against lateral impacts. The results can be used, for example, in an analytical study of offshore (PDF) Effect of Internal Pressure and Dent Depth on Strain theoretical analysis of local indentation on pressured pipes[10] Liu, J.H., Francis, A. (2004) Theoretical ana lysis of local indentation on pressured pipes . International Journal of Pressure Vessels and Piping 81 (12) ,

(PDF) Lateral indentation of filament wound GRP tubes theoretical analysis of local indentation on pressured pipes

The analysis made allowance for the large displacements. The tube wall material was modelled as a monolithic, orthotropic continuum. The theoretical results are compared with experimental data from tube indentation tests. Final failure is shown to be due to local axial shell buckling. 1. (PDF) Strain based evaluation of dents in pressurized pipesTheoretical analysis of local indentation on pressured pipes . Article. Dec 2004; theoretical analysis of local indentation on pressured pipes For the same dent depth, a higher external denting force is required for 10.1016/j.ijpvp.2004.05.007 10.1016/j.ijpvp theoretical analysis of local indentation on pressured pipes - DeepDyve(16b) and (16c) , respectively h pipe shell thickness l the length of the indent deformation zone and the length of the indenter p internal pressure for land pipelines and p = p in p out for subsea pipelines p in internal pressure p out external pressure p pR 2 / y h 2 t time u , w horizontal and vertical displacements for the point at theoretical analysis of local indentation on pressured pipes

1235. Peak cycle stress analysis of plain dent on pipeline theoretical analysis of local indentation on pressured pipes

Poiss ratio is 0.3. The theoretical elasticity modulus is 206000 MPa. The maximum yield strength is 464 MPa. The minimum ultimate strength is 508 MPa. According to the real stress state and geometry shape of the pipe in the presence of internal pressure , half pipe including dent defects was selected by axisymmetric principle. A numerical study on the high-velocity impact behavior of theoretical analysis of local indentation on pressured pipesPressure pipes are widely used in modern industry with some in potentially dangerous situations of explosion and impact. The security problems of these pipes when subjected to impact have attracted a lot of attention. A non-linear numerical model has therefore been developed to investigate the dynamic behavior of pressure pipes subjected to high A theoretical analysis on the failure of unpressurized and theoretical analysis of local indentation on pressured pipesA theoretical quasi-static analysis is proposed to predict the response and the onset of failure for pipelines. The maximum strain criterion, the effect of strain rate and an empirical formula for estimating the length of a plastic hinge are employed in the analysis .

Advances in Mechanical Engineering 2017, Vol. 9(5) 18 theoretical analysis of local indentation on pressured pipes

Theoretical analysis of pipeline with type I dent under the external force Ying Wu, Pengwei Jin and Peng Zhang theoretical analysis of local indentation on pressured pipes of the pressure pipe to the external force, and provides a theoretical guidance for maintaining pipeline in service. theoretical analysis of local indentation on pressured pipes the indentation , the second term on the right-hand side is the crushing energy of the central dented zone, and theoretical analysis of local indentation on pressured pipes An Equivalent Creep Crack Growth Model for Probabilistic theoretical analysis of local indentation on pressured pipesAn asymptotic solution for the SIF is adopted from Liu and Mahadevan to consider the damages in pipes as local stress risers. Next, the model was calibrated and validated using experimental creep data on Aldyl-A pipe . The experiments were done on a total of five groups of pipes with different surface conditions. An optical coherence tomography (OCT)-based air jet theoretical analysis of local indentation on pressured pipesA larger value of k aj was consistently observed from the air jet indentation system than k std, which might be attributed to the fact that a larger pressure was measured inside the air pipe than at the surface of the specimen where the air jet induced the deformation. The compression test showed that the stiffness of the phantoms was 558 ± theoretical analysis of local indentation on pressured pipes

Buckle Propagation in Steel Pipes of Ultra-high Strength theoretical analysis of local indentation on pressured pipes

In this paper, experimental, theoretical and numerical approaches were employed to scrutinize the buckle propagation events occurring in pipes subjected to external pressure . Two groups of samples with different radius-to-thickness ratios were fabricated using steel pipes of ultra-high strength and were subjected to compression of external pressure in a sealed Calculation of Stress Intensity Factors at Both Ends of theoretical analysis of local indentation on pressured pipesDuring rock breaking by drill, cone rolls on the rock surface and contact between gear teeth and surface is basically positive Mode-I plane indentation and bias Mode-I plane indentation . During bias action, there will be an asymmetrical Mode-I singular stress field at both ends of the indenter. The stress field singularity is of the same order as Mode-I crack tip and with the same function theoretical analysis of local indentation on pressured pipes Characterization of Anisotropy of Strength in API-X80 Line theoretical analysis of local indentation on pressured pipesIn this work, an instrumented indentation technique with a nearly flat tip indenter was used to measure the yield strength of API-X80 line pipe weld. Using this technique, the yield strength can be estimated directly from the indentation loaddisplacement response. The yield strength of the weld metal was measured in the transverse (hoop) and longitudinal (long)

Considerations When Restraining Molecularly Oriented

out, one edge produces significantly more contact pressure , which puts the pipe wall in local bending (compression on the outside, tension on the inside). This, in combination with the indentation marks, is a typical mechanism for fatigue failure. Cyclic indentation of polymers Instantaneous elastic theoretical analysis of local indentation on pressured pipesIntroduction. Nano- and micro-instrumented indentation techniques are now common to characterize the metallic materials. Some of the obvious advantages of these techniques are a small tested volume, which enables characterization of material gradients and heterogeneous materials, and a simple analysis method that provides hardness and elastic modulus Dedicated to AMAL6.4 Deterministic Analysis of the Base Case 167 6.4.1 Strain Fields at End of Indentation Phase 167 6.4.2 Stress Fields at End of Indentation Phase 171 6.4.3 Stress Range at End of Pressure Cycle and Fatigue Analysis 171 6.5 Probabilistic analysis 174 6.5.1 Random Input Variables 174 6.5.2 Probability Analysis Loops 176

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Advanced theory design of trunnion type pipe supports added in compliance with ASME III Section Y-5000 and EPRI TR-107453, giving a far more accurate picture of weld and local stresses in both straight pipe and elbow attachments. Version 3.02 Wind loads on piping to EN-1991-1-4 added. Stiffness of combined piping and refractory lining added. Effect of Internal Pressure and Dent Depth on Strain theoretical analysis of local indentation on pressured pipes[10] Liu, J.H., Francis, A. (2004) Theoretical analysis of local indentation on pressured pipes . International Journal of Pressure Vessels and Piping 81 (12) , pp.931-939. International Journal of Pressure Vessels and Piping 81 (12) , pp.931-939. Effect of Local Plastic Strains on the Physicomechanical theoretical analysis of local indentation on pressured pipesAs the internal pressure increases further, the level of stresses at the central point of the deformed zone increases to 315 P, whereas the level of stresses on the contour of the indent in the pipe increases to 170 P. Under the action of internal pressure in the pipe that rests on the stone rock, the indent partially flattens (Fig. 5).

Estimation of Fracture Toughness of Metallic Materials theoretical analysis of local indentation on pressured pipes

Equation indicates that when the indentation mean pressure reaches 2.88 times the yield strength of the metallic material, yielding occurs at r = a.We define equation as the first critical condition required for crack extension in the critical stress model because at that value, ring cracking is induced in brittle materials, such as glasses and ceramics [].The second Experimental validation of finite element approaches to theoretical analysis of local indentation on pressured pipesThe elasticplastic response of pressurized and unpressurized pipes, subjected to localized indentations , has been investigated using finite element (FE) analyses and experimental testing. A visual theoretical analysis of local indentation on pressured pipes Fatigue Life Analysis of Dented Pipes Subjected to theoretical analysis of local indentation on pressured pipesA parametric study conducted on 150 cases of dented pipes subjected to internal pressure between 0% and 50% MOP (maximum operating pressure ) enabled us to analyze the effect of the various types of dents on the integrity of the structure. theoretical analysis of local indentation on pressured pipes A. A. Becker, Elasticplastic analysis of offset indentations on unpressurised pipes , International theoretical analysis of local indentation on pressured pipes

How is the stress intensity of piping determined?How is the stress intensity of piping determined?The basic stress intensity limits for the stress categories just described are determined by the application of limit design theory together with suitable safety factors. The piping is assumed to be elastic and perfectly plastic with no strain hardening.Piping Failure Theories, Stress Categories, Stress Limits, and Fatigue Indentation and Splitting of Freshwater Ice Floes J theoretical analysis of local indentation on pressured pipes

Small-scale indentation and floe-splitting experiments were conducted on columnar ice floes of various sizes and at different speeds. During low-speed indentation (0.28 mm s 1), the ice floes always split apart, while at higher indentation speeds (> 100 mm s 1) they did not.The rea is attributed to differences in the process of deformation and failure. Influence of AFM Tip Temperature on THF Hydrate Stability theoretical analysis of local indentation on pressured pipesThe local temperature rises when the tip touches the THF hydrate. It is easier for THF hydrate to be melted by the external pressure . For AFM indentation measurement on the cold clathrate hydrates, the thermal melting needs to be considered unless the temperature of the tip is lowered enough. Data Availability. No data were used to support this theoretical analysis of local indentation on pressured pipes

Influence of Internal Pressure on the Impact Behavior of theoretical analysis of local indentation on pressured pipes

This article presents some experimental data recorded from 54 impact tests on pressurized mild steel pipes . The pipes were fully clamped across a span which was ten times the outside pipe diameter of 60 mm. The pipes had a wall thickness of 1.70 mm and were impacted laterally by a rigid wedge indenter at the mid-span and one-quarter-span positions. Lateral Loading of Internally Pressurized Steel Pipes J theoretical analysis of local indentation on pressured pipesThis paper examines the denting response of pipes subjected to lateral (transverse) quasistatic wedge loading, in the presence of internal pressure . Pipes are modeled with nonlinear shell finite elements and a simplified analytical model. The analysis focuses on the significant influence of internal pressure on the denting resistance. Load Bearing Capacity of a Dented Aluminum Pipe dented Aluminum pipe subjected to internal pressure is investiga-ted. The plastic behavior of pipes under indentation is studied using continuum damage mechanics theory and the elastic-plastic finite element analysis . Finite element calculations are carried out using the damage plasticity model proposed by Xue and Wierzbi-cki.

Load Bearing Capacity of a Dented Aluminum Pipe Subjected theoretical analysis of local indentation on pressured pipes

Abstract. In this paper, the effect of ductile damage on the behavior of a dented Aluminum pipe subjected to internal pressure is investigated. The plastic behavior of pipes under indentation is studied using continuum damage mechanics theory New Limit State Functions for Determining the Puncture theoretical analysis of local indentation on pressured pipesIn this paper the influence of pressure on the pipeline indentation is addressed using both theoretical and finite element analyses. A closed-form solution of force-deformation relationship based on a consideration of rigid-plastic deformation theory , that gives a good agreement with results from both FE analyses and experimental tests, is theoretical analysis of local indentation on pressured pipes Numerical simulation with nite element and articial theoretical analysis of local indentation on pressured pipes182 KamalSharmaetal Nomenclature d t is the total indentation diameter. h t is total depth of indentation . d p is the diameter of plastic indentation . h p is depth after unloading. h e is the elastic component of deformation. D is the ball diameter. P is the applied load. Figure 1. Illustration of parameters of ball indentation . 1. Introduction

Peak cycle stress analysis of plain dent on pipeline based theoretical analysis of local indentation on pressured pipes

Poiss ratio is 0.3. The theoretical elasticity modulus is 206000 MPa. The maximum yield strength is 464 MPa. The minimum ultimate strength is 508 MPa. According to the real stress state and geometry shape of the pipe in the presence of internal pressure , half pipe including dent defects was selected by axisymmetric principle. Piping Failure Theories, Stress Categories, Stress Limits theoretical analysis of local indentation on pressured pipesThe failure theories most commonly used in describing the strength of piping systems are the maximum principal stress theory and the maximum shear stress theory (also known as the Tresca criterion). The maximum principal stress theory forms the basis for piping systems governed by ASME B31 and Subsections NC and ND (Classes 2 and 3) of Section III Prediction of three-dimensional residual stresses at theoretical analysis of local indentation on pressured pipesTheoretical analysis of local indentation on pressured pipes Int J Press Vessels Piping , 81 ( 2004 ) , pp. 931 - 939 Article Download

Prediction of three-dimensional residual stresses at theoretical analysis of local indentation on pressured pipes

These show that the pressure p=pinpout has a large influence on the pipe resistance to the indentation , where pin and pout are the internal and external pressure , respectively. Progressive Failure Analysis Scientific.NetFor this rea it is mandatory to find out the ply by ply failure. The first ply failure of basalt filament wound pipes subjected to internal pressure is calculated using Finite element analysis . Then the stress and progressive failure analysis was carried out. Maximum stress failure criterion is used for the finite element analysis . QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETYThrough the theoretical equations, thermal cycles of twin wire SAW with actual welding conditions used in pipe fabrication were predicted and verified by both FEM and experiment. A good agreement among theoretical results, FEM and experimental results was achieved.

THE EFFECT OF DENTS IN PIPELINES GUIDANCE IN THE theoretical analysis of local indentation on pressured pipes

internal pressure changes. constrained dent a dent that is not free to rebound or reround, because the indenter is not removed (a rock dent is an example of a constrained dent). D t H Figure 1 The dimensions of a dent THE SIGNIFICANCE OF DENTS A dent causes a local stress and strain concentration and a local reduction in the pipe diameter. The erosion wear mechanism of liquid-solid two-phase high theoretical analysis of local indentation on pressured pipesThe wall thickness of pressure pipe is often thinned due to the erosion wear, which leads to pipe failure and even safety accidents. In particular, the tee pipe is more prone to be erosive as a key component of transferring fluid with particles. Therefore, the erosion wear mechanism of high pressure manifold tee pipe based on liquid-solid two-phase flow is studied in this paper. Theoretical prediction model for indentation of pipe-in theoretical analysis of local indentation on pressured pipesIn this study, the theoretical prediction model for indentation of PIP structures is developed from the simplified shell model. Based on the difference between single wall pipe structure and PIP structure in the experiment (shown in Fig. 3) and FE model, the mechanism of PIP structure indentation by external load is investigated which is divided into three stages

Uni-Bell - PVC Pipe Association

HYDRAULIC ANALYSIS PUMPING COSTS FOR PVC AND DUCTILE IRON PIPE . Using accepted hydraulic theory and pump design, this technical report examines head loss and pumping costs over 100-years for PVC and ductile iron pipe . When industry-accepted data are used, PVC pipe is shown to be more efficient. CLICK HERE for technical report. What does a dent in a pipeline mean?What does a dent in a pipeline mean?A dent in a pipeline is a permanent plastic deformation of the circular cross section of the pipe. A dent is a gross distortion of the pipe cross-section. Dent depth is defined as the maximum reduction in the diameter of the pipe compared to the original diameter (i.e. the nominal diameter less the minimum diameter) (see Figure 1).THE EFFECT OF DENTS IN PIPELINES GUIDANCE IN THE theoretical analysis of local indentation on pressured pipes What is the allowable secondary stress range for a pipe?What is the allowable secondary stress range for a pipe?Therefore, the allowable secondary stress range can be as high as 2Sy when S1 = 2Sy. When S1 > 2Sy, the pipe yields in compression and all subsequent cycles generate plastic strain EF. For this rea 2Sy is the limiting secondary stress which will shake down to purely elastic action.Piping Failure Theories, Stress Categories, Stress Limits, and Fatigue

When is a pipe under combined bending and tension?When is a pipe under combined bending and tension?When a pipe is under a combination of bending and axial tension, the limit load depends on the ratio between bending and tension. In Fig. B4.1, the limit stress at the outer ber of a rectangular bar under combined bending and tension is plotted against the average tensile stress across the section.Piping Failure Theories, Stress Categories, Stress Limits, and FatigueCited by 1 Publish Year 2013 Author Maziar Ramezani, Thomas Rainer Neitzert PAPER OPEN ACCESS Remaining strength assessment of

analysis . Static indentation was held with using half ball indenter. Variations of applied load are 600 N, 1000 N, 1500 N, 2000 N, and 2500 N. theoretical analysis of local indentation on pressured pipes pressure applied to the pipe . Operation pressure was varied with (P/Py) 0.2, 0.4, 0.6, 0.8, and 1. theoretical analysis of local indentation on pressured pipes of theoretical calculation. The conclusion is that by pressing the larger pipe operation the forceCited by 13 Publish Year 2009 Author T.H. Hyde, R. Luo, A.A. Becker Theoretical analysis of type II dent pipe under external theoretical analysis of local indentation on pressured pipesThe detailed deformation of the dent pipe is shown in Fig. 2.Since the energy released by the dent is absorbed by the pipe shell, the overall deformation is negligible for the pipe in the pipe trench [].Analysis of the actual deformation shows that the local deformation region is composed of three regions the middle dimple region and the triangular regions on

Cited by 19 Publish Year 2004 Author J.H. Liu, A. Francis Theoretical analysis of local indentation on pressured pipes

Download Citation Theoretical analysis of local indentation on pressured pipes A quasi-static analysis is presented in this paper for in-service pressurised pipelines subjected to Cited by 4 Publish Year Author Ying Wu, Linya Li (PDF) Theoretical analysis of pipeline with type I dent theoretical analysis of local indentation on pressured pipesTheoretical analysis of pipeline with type I dent under the external force. May 2017. Advances in Mechanical Engineering 9 (5):168781401770559. DOI Cited by 5 Publish Year Author Chenggong Sun, Miaozi Zheng, Carlos Guedes Soares, Menglan Duan, Yi Wang, Mac Darlington Uche Onuoha Analysis of stresses in pipes indented by long external theoretical analysis of local indentation on pressured pipesTheoretical analysis of local indentation on pressured pipes Int J Press Vessel Piping , 81 ( 2004 ) , pp. 931 - 939 Article Download PDF View Record in Scopus Google Scholar

5 mins Influence Of Internal Pressure To The Pipe Resistance

solutions that can ensure pipeline safety. Since 1973, many analyses have been conducted on pipes and rings to simulate the pipe indentation with combinations of dent depth or gouge. In most of these tests, the pipes and rings were first indented or perforated without any internal or external pressure . Then, they were pressurized to failure.Theoretical analysis of local indentation on pressured pipes2.. Theoretical analysisWhen a pipeline is subjected to a local indentation , the deformation profile shown in Fig. 1 is assumed. The global deformation is neglected for pipelines laid in their foundation (trench), since most of the denting energy is absorbed by the pipe shell as local deformations .The local deformation region consists of three zones the indented zone in

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