Local collapse of the pipeline wall under combined loading

UDK: 622.692.4-192
DOI: 10.24887/0028-2448-2019-4-107-109
Key words: main pipeline, operating conditions, internal pressure, temperature differential, bearing capacity, local collapse, finite element calculation
Authors: Ya.M. Fridland (The Pipeline Transport Institute LLC, RF, Moscow), D.A. Neganov (The Pipeline Transport Institute LLC, RF, Moscow), V.M. Varshitskii (The Pipeline Transport Institute LLC, RF, Moscow), A.A. Bogatch (The Pipeline Transport Institute LLC, RF, Moscow)

The article presents the results of computer simulation of the conditions for the formation of a local collapse of the pipeline wall, depending on the ratio of internal forces, which are implemented in the cross section of the pipeline under various operating conditions. The values of the maximum bending moment of the pipeline with the loss of local stability of the wall depending on the internal pressure and axial force associated for the underground pipeline with the internal pressure and temperature differential are obtained. The pipeline bending was simulated using the LS-DYNA software for engineering calculations in a three-dimensional shell formulation using finite elements of the first order of accuracy. The plastic properties of the material of the pipe wall were set by a power-stress-strain diagram. The axial force was set in a wide range of values, overlapping tension and compression. Moment loading was set by turning the pipe ends at a constant speed for fixed values of the internal pressure and axial force. The limiting bending moment was determined at the maximum of the moment dependence on the angle of rotation of the ends. According to the results of a series of calculations, the dependences of the limiting bending moment on the axial force for two values of internal pressure 0 and 3.8 MPa are obtained. Fr om the dependencies obtained, it was concluded that the internal pressure with tensile axial loads increases the resistance of the pipe wall to local collapse, while with compressive pressure it decreases. The resulting effect of internal pressure with compressive axial forces differs fr om the results of P. Schaumann, Ch. Keindorf, H. Brьggemann (2005), wh ere a conclusion was made about the supporting effect of internal pressure on the local collapse of the wall with both tensile and compressive axial forces.

References

1. Lisin YU.V., Ermish S.V., Makhutov N.A. et al., Impact of stress-strain state of the pipeline on the lim it state of the pipeline (In Russ.), Nauka i tehnologiya truboprovodnogo transporta nefti i nefteproduktov = Science & Technologies: Oil and Oil Products Pipeline Transportation, 2017, V. 7, no. 4, pp. 12-16.

2. Varshitskiy V.M., Zhulidov S.N., Engineering evaluation of the performance of defect-free girth welds of underground pipelines in areas with nonnormative axis curvature (In Russ.), Nauka i tehnologiya truboprovodnogo transporta nefti i nefteproduktov = Science & Technologies: Oil and Oil Products Pipeline Transportation, 2018, V. 8, no. 5, pp. 490-495.

3. Schaumann P., Keindorf Ch., Brьggemann H., Еlasto-plastic behavior and buckling analysis of steel pipelines exposed to internal pressure and additional loads, Proceedings of OMAE2005, 2005, June 12-17, Halkidiki, Greece.

4. Nobuhisa S., Joe K., Junji S., Strain capacity of high-strength line pipes, JFE GIHO, 2007, no. 17, Aug., pp. 31–36.

5. Hauch S., Bai Y., Bending moment capacity of pipes, Proceedings of the 18th International Conference on Offshore, Mechanics and Arctic Engineering, OMAE, 1999, Paper no. PL-99-5033.

6. Tsuru E., Agata J., Nagata Y., Analytical approach for buckling resistance of UOE Linepipe with orthogonal anisotropy under combined loading, Proceedings of the 8th International Pipeline Conference IPC2010 September 27 - October 1, 2010, Calgary, Alberta.

7. Nobuhisa S., Tajika H., Igi S., Local buckling behavior of 48” x80 high-strain line pipes, Proceedings of the 8th International Pipeline Conference IPC2010 September 27-October 1, 2010, Calgary, Alberta, 2010.

8. LS-DYNA keyword user's manual, LSTC, Version R7.0, February 2013.

The article presents the results of computer simulation of the conditions for the formation of a local collapse of the pipeline wall, depending on the ratio of internal forces, which are implemented in the cross section of the pipeline under various operating conditions. The values of the maximum bending moment of the pipeline with the loss of local stability of the wall depending on the internal pressure and axial force associated for the underground pipeline with the internal pressure and temperature differential are obtained. The pipeline bending was simulated using the LS-DYNA software for engineering calculations in a three-dimensional shell formulation using finite elements of the first order of accuracy. The plastic properties of the material of the pipe wall were set by a power-stress-strain diagram. The axial force was set in a wide range of values, overlapping tension and compression. Moment loading was set by turning the pipe ends at a constant speed for fixed values of the internal pressure and axial force. The limiting bending moment was determined at the maximum of the moment dependence on the angle of rotation of the ends. According to the results of a series of calculations, the dependences of the limiting bending moment on the axial force for two values of internal pressure 0 and 3.8 MPa are obtained. Fr om the dependencies obtained, it was concluded that the internal pressure with tensile axial loads increases the resistance of the pipe wall to local collapse, while with compressive pressure it decreases. The resulting effect of internal pressure with compressive axial forces differs fr om the results of P. Schaumann, Ch. Keindorf, H. Brьggemann (2005), wh ere a conclusion was made about the supporting effect of internal pressure on the local collapse of the wall with both tensile and compressive axial forces.

References

1. Lisin YU.V., Ermish S.V., Makhutov N.A. et al., Impact of stress-strain state of the pipeline on the lim it state of the pipeline (In Russ.), Nauka i tehnologiya truboprovodnogo transporta nefti i nefteproduktov = Science & Technologies: Oil and Oil Products Pipeline Transportation, 2017, V. 7, no. 4, pp. 12-16.

2. Varshitskiy V.M., Zhulidov S.N., Engineering evaluation of the performance of defect-free girth welds of underground pipelines in areas with nonnormative axis curvature (In Russ.), Nauka i tehnologiya truboprovodnogo transporta nefti i nefteproduktov = Science & Technologies: Oil and Oil Products Pipeline Transportation, 2018, V. 8, no. 5, pp. 490-495.

3. Schaumann P., Keindorf Ch., Brьggemann H., Еlasto-plastic behavior and buckling analysis of steel pipelines exposed to internal pressure and additional loads, Proceedings of OMAE2005, 2005, June 12-17, Halkidiki, Greece.

4. Nobuhisa S., Joe K., Junji S., Strain capacity of high-strength line pipes, JFE GIHO, 2007, no. 17, Aug., pp. 31–36.

5. Hauch S., Bai Y., Bending moment capacity of pipes, Proceedings of the 18th International Conference on Offshore, Mechanics and Arctic Engineering, OMAE, 1999, Paper no. PL-99-5033.

6. Tsuru E., Agata J., Nagata Y., Analytical approach for buckling resistance of UOE Linepipe with orthogonal anisotropy under combined loading, Proceedings of the 8th International Pipeline Conference IPC2010 September 27 - October 1, 2010, Calgary, Alberta.

7. Nobuhisa S., Tajika H., Igi S., Local buckling behavior of 48” x80 high-strain line pipes, Proceedings of the 8th International Pipeline Conference IPC2010 September 27-October 1, 2010, Calgary, Alberta, 2010.

8. LS-DYNA keyword user's manual, LSTC, Version R7.0, February 2013.


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