Stress-strain assessment of dents in wall of high pressure gas pipeline

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F25797000%3A_____%2F17%3AN0000038" target="_blank" >RIV/25797000:_____/17:N0000038 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1016/j.prostr.2017.07.180" target="_blank" >http://dx.doi.org/10.1016/j.prostr.2017.07.180</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.prostr.2017.07.180" target="_blank" >10.1016/j.prostr.2017.07.180</a>

Result language

angličtina

Original language name

Stress-strain assessment of dents in wall of high pressure gas pipeline

Original language description

The aim of this work was experimental study of the dents effect on structural integrity of a high-pressure gas pipeline with nominal diameter 300 mm after long-terme operation. Stress-strain behaviour of two dents was evaluated by strain gauge chains oriented in hoop direction. Dent profiles were measured by digital slide caliper in circumferential and longitudinal direction in points distant 10 mm from each other. Residual deformations were detected after internal pressure loading by water to the operating level. Negative and positive values of residual deformation were found wuth the help of strain gauges. Fatigue resistance was tested by 10 000 pressures cycles with load asymmetry R = 0 and maximum internal pressure p(max) = 6,3 MPa (nominal operating level). Internal pressure cyclic loading caused an increase of residual deformation values. By means of subsequent pressure burst test, the limit state of this type defect was found. Two dwells were realized in 66% and 100% yield stress. Negative values of strain were observed at strain gauges placed on edge of dents. Positive values of strain were found at strain gauges placed inside the dents. The increase of internal pressure led to the changes of dent shape. Dent depth decreased and the original circular tube profile was reached again. The pipe fracture occurred at the internal pressure of 19 MPa. Tensile properties and Charpy absorbed energy were measured on standartized specimens of the pipe material. (C) 2017 The Authors. Published by Elsevier B.V.

Czech name

—

Czech description

—

Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

20501 - Materials engineering

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Procedia Structural Integrity

ISBN

—

ISSN

2452-3216

e-ISSN

—

Number of pages

7

Pages from-to

340-346

Publisher name

ELSEVIER SCIENCE BV

Place of publication

Amsterdam

Event location

Funchal, Portugalsko

Event date

Jul 4, 2017

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

—