TY  - CONF
AU  - Rakin, Marko
AU  - Međo, Bojan
AU  - Musrati, Walid
AU  - Gubeljak, Nenad
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6179
AB  - In recent years, several attempts have been made by research groups worldwide to propose and verify new laboratory specimens
for measurement of pipeline materials fracture resistance. The main reason for these efforts is the requirement of standard
fracture mechanics procedures for relatively large specimen thickness, i.e. plane strain conditions. It is almost impossible,
and also too conservative, to apply such an approach to the thin-walled pipes, which form the majority of industrial pipelines.
Failure resistance of pipeline steel is examined by testing the recently proposed Pipe Ring Notched Bend (PRNB) specimens
with different dimensions. The seam, i.e. longitudinal weld, is analysed as a source of material heterogeneity;
however, seamless pipes are also examined. The results are repeatable, and the dependence on the specimen geometry is
not significant (it is even lower than it could be expected from standard thick fracture mechanics specimens). The seam
materials (weld metals) have shown different fracture behaviour for different batches/sizes of the pipes; they have either
lower or similar fracture resistance in comparison with the base material. Briefly, it can be said that fracture testing of a
relatively small amount of specimens revealed a lot of important data about the resistance of the pipes to ductile failure.
Fracture is modelled by application of the micromechanical approach in software package Abaqus, in particular the
Complete Gurson model. Additionally, the model is used for prediction of fracture resistance in plane strain conditions.
This can be useful for comparison of the examined pipe materials and others with known plane strain fracture properties.
Currently, the authors are working on a new geometry: pipe rings with a sharp notch exposed to tensile loading. This
will form a comprehensive approach to pipeline testing, where two geometries and two loading regimes (bending and
tension) will be available in the framework of a unified testing procedure.
C3  - 3rd Global Webinar on Materials Science and Engineering
T1  - Failure assessment of steel pipes using non-standard ring specimens.
SP  - 11
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6179
ER  - 

@conference{
author = "Rakin, Marko and Međo, Bojan and Musrati, Walid and Gubeljak, Nenad",
year = "2022",
abstract = "In recent years, several attempts have been made by research groups worldwide to propose and verify new laboratory specimens
for measurement of pipeline materials fracture resistance. The main reason for these efforts is the requirement of standard
fracture mechanics procedures for relatively large specimen thickness, i.e. plane strain conditions. It is almost impossible,
and also too conservative, to apply such an approach to the thin-walled pipes, which form the majority of industrial pipelines.
Failure resistance of pipeline steel is examined by testing the recently proposed Pipe Ring Notched Bend (PRNB) specimens
with different dimensions. The seam, i.e. longitudinal weld, is analysed as a source of material heterogeneity;
however, seamless pipes are also examined. The results are repeatable, and the dependence on the specimen geometry is
not significant (it is even lower than it could be expected from standard thick fracture mechanics specimens). The seam
materials (weld metals) have shown different fracture behaviour for different batches/sizes of the pipes; they have either
lower or similar fracture resistance in comparison with the base material. Briefly, it can be said that fracture testing of a
relatively small amount of specimens revealed a lot of important data about the resistance of the pipes to ductile failure.
Fracture is modelled by application of the micromechanical approach in software package Abaqus, in particular the
Complete Gurson model. Additionally, the model is used for prediction of fracture resistance in plane strain conditions.
This can be useful for comparison of the examined pipe materials and others with known plane strain fracture properties.
Currently, the authors are working on a new geometry: pipe rings with a sharp notch exposed to tensile loading. This
will form a comprehensive approach to pipeline testing, where two geometries and two loading regimes (bending and
tension) will be available in the framework of a unified testing procedure.",
journal = "3rd Global Webinar on Materials Science and Engineering",
title = "Failure assessment of steel pipes using non-standard ring specimens.",
pages = "11",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6179"
}

Rakin, M., Međo, B., Musrati, W.,& Gubeljak, N.. (2022). Failure assessment of steel pipes using non-standard ring specimens.. in 3rd Global Webinar on Materials Science and Engineering, 11.
https://hdl.handle.net/21.15107/rcub_technorep_6179

Rakin M, Međo B, Musrati W, Gubeljak N. Failure assessment of steel pipes using non-standard ring specimens.. in 3rd Global Webinar on Materials Science and Engineering. 2022;:11.
https://hdl.handle.net/21.15107/rcub_technorep_6179 .

Rakin, Marko, Međo, Bojan, Musrati, Walid, Gubeljak, Nenad, "Failure assessment of steel pipes using non-standard ring specimens." in 3rd Global Webinar on Materials Science and Engineering (2022):11,
https://hdl.handle.net/21.15107/rcub_technorep_6179 .