theoretical analysis of local indentation on pressured pipes

$ering ARCHIVES Departmental Graduate Committee

develop the background theory for this project. "Stresses Fom Local Loadings in Cylindrical Pressure Vessels" presents the basic theory for analyzing stresses at attachment-shell intersections through Fourier analysis. By starting with the partial differential equations of thin-shell theory, which

(PDF) Lateral indentation of filament wound GRP tubes

The wall thickness used in the theoretical analysis was 1.016 mm, based upon a mean value provided by the tube supplier. However, measurements taken at numerous positions on the surface of any one of these thin-walled tubes show variations in local wall thickness of the order of 5-10%. A Review of Water Hammer Theory and PracticeTheory and Practice Hydraulic transients in closed conduits have been a subject of both theoretical study and intense practical interest for more than one hundred years. While straightforward in terms of the one-dimensional nature of pipe networks, the full description of transient uid ows pose interesting problems in uid dynamics.

A Theoretical Approach to Predict the Fatigue Life of

2.4. Local Analysis. It is common practice in the analysis of flexible pipes to split the total stresses in the wires into two components:stresses associated with axisymmetric loads and stresses induced by the imposed bending moments or curvatures . The same approach is employed in this work, and in what follows the computation of these stresses is outlined. ASME B31.3 Process Piping GuideLANL Engineering Standards Manual STD-342-100 Chapter 17-Pressure Safety Section REF References Rev. 0, 09/17/2014 REF-3 ASME B31.3 Process Piping Guide 1 of 171 . ASME B31.3 Process Piping Guide

An optical coherence tomography (OCT)-based air jet

Nov 20, 2008 · In the current study, the air jet indentation was assumed to be similar to the indentation with a rigid contact by hypothesizing that the air pressure measured in the pipe was linearly proportional to the force induced on the specimen. Choosing a beam element3 is the section shear stiffness in the -direction; f p f p is a dimensionless factor used to prevent the shear stiffness from becoming too large in slender beam elements; K3 K . . 3 is the actual shear stiffness of the section; and =1,2 = 1, 2 are the local directions of the cross-section. The K3 K .

Comparison of Ductile Fracture Models on Load Bearing

Aug 24, 2014 · The target dent depth is considered as an indication of the load bearing capacity of the aluminum pipe with internal pressure under indentation process. Different combination of parameters that play important role in predicting the fracture initiation is considered by each of Effect of Internal Pressure and Dent Depth on Strain Abstract:A dent in a pipeline is a permanent plastic deformation of the circular cross section of the pipe. This paper discusses numerical results obtained from finite element (FE) simulation of pressurized pipe subjected to radial denting by a rigid indenter. Dent produced by rectangular shape indenter is assessed and the strain distribution of the pipe is investigated.

Experimental validation of finite element approaches to

Sep 12, 2008 · The elasticplastic response of pressurized and unpressurized pipes, subjected to localized indentations, has been investigated using finite element (FE) analyses and experimental testing. A visual Flexible Riser Annulus Condition Assessmentassociated with local time domain cross section analysis allow for an accurate evaluation of accumulated fatigue damage and estimation of remaining service life. The ability to define appropriate armour wire annulus conditions at various locations along the riser supports a more precise fatigue appraisal during local cross section analysis, without

Glass Standards and Ceramic Standards - ASTM

Glass Standards and Ceramic Standards. ASTM's glass and ceramic standards are instrumental in specifying, testing, and evaluating the chemical, physical, and mechanical properties of various materials and products made of glass, ceramic, or clay. These materials are fabricated for a variety of purposes including arts and aesthetics, foodware LOCAL LOSSES IN PIPE FLOWS Principle Introduction9 Upstream vel. head (ft H 2 O) Downstream vel. head (ft H 2 O) Energy Drop (ft H 2 O) Pipe-loss corr. (ft H 2 O) K Data Analysis Determination of the coefficient K consists of plotting the experimental local loss coefficients versus the corresponding Reynolds numbers (Re = VD/n, where D is thepipe diameter and n is the kinematic viscosity) for known discharges through the device.

On The Stiffness Prediction of GFRP Pipes Subjected to

Jul 07, 2018 · The main objective of this study is to predict the stiffness of GFRP pipes subjected to compressive transverse loading. An experimental study is performed to measure the stiffness of a composite pipe with a core layer of sand/resin composites. Then, a simple analytical modeling constructed on the basis of solid mechanics is used to estimate the stiffness of the investigated pipe PAPER OPEN ACCESS Remaining strength assessment of Dent is one of the defects in the pipe material due to applied load, whether static or impact load, resulting in emergence of a local curve or dent, generally inward of the main axis of the pipe. In piping systems, external applied load may be caused by many things, such as due to rock pressure around the

PIPE STRESS:MYSTERY & MAGIC Technical Brief

The photo below depicts a pipe restraint failure, because expansion forces were not considered in the design of the support. Thermal stress analysis is a static analysis, and compares weight and pressure (sustained load case) with weight, pressure and temperature (operating load case). The difference is Process Piping Fundamentals, Codes and StandardsCalculate allowable internal pressure P for Schedule 40 mild steel pipe having ultimate tensile strength (S value) of 65,300 psi. Rearrange the schedule equation:P = SCH x S/1,000 . Therefore, P = 40 x 65,300/1,000 = 2,612 psi. This is reasonable, based on a current

Stress Analysis of Thin-Walled Pressure Vessels

Stress Analysis Thin-Walled Pressure Vessel, 1. Introduction Pressure vessels are compressed gas storage tanks designed to hold gases or liquids at a pressure substantially different from the ambient pressure. They have a variety of applications in industry, including in oil refineries, Theoretical Design of a Thermosyphon for Efficient temperature range in which the heat pipe will be used. Heat is applied to one end of the heat pipe (evaporator), the local temperature is raised leading to evaporation of the working fluid. Because of the saturation conditions this temperature difference results in a difference in vapor pressure which in turn causes vapor to flow from the

Towards standardized mechanical characterization of

Aug 20, 2018 · The heterogeneity of its mechanical properties is directly related to the local microstructure of the biofilm. There is a correlation between microscale morphology, macroscale configuration and Tutorial - Hertz Contact StressThe summary of this is that pressure distribution proposed by Hertz p= p 0(1 (r=a)2)1=2 (4) where ris the radius of the measure pressure and p 0 is the maximum pressure of contact between two solids. This relation with the geometry determined for contact of two spheres results in the radius of the area of contact as a= p 0R e 2E (5)

10.1016/j.ijpvp.2004.05.007 DeepDyve

Jun 11, 2020 · (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