PSI - Issue 20

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 20 (2019) 63–74

1st International Conference on Integrity and Lifetime in Extreme Environment (ILEE-2019) Influence of temperature factor on probabilistic characteristics of main mechanical properties and safety factors N.A. Makhutov, V.V. Zatsarinnyy* Mechanical Engineering Research Institute named by A.A.Blagonravov, Russian Academy of Sciences, Maly Kharitonievsky per. 4, Moscow, 101990, Russia Abstract Effect of temperature factor on probabilistic characteristics of main mechanical properties and safety factors has been investigated; this effect should be taken into account in the approaches when strength and lifetime of the structures working at low climatic temperatures under the conditions of Siberia and Extreme North are calculated. It is shown that in these conditions the main damaging factors for industrial facilities, equipment and main pipelines are low operating temperature, snow and ice loads. According to the data of experiment with using standard specimens and literature data for steel 15H2NMFA and steel 3 conducted by the proposed procedure the probabilistic characteristics of strength and plasticity under the conditions of homogeneous stress state at both normal and negative temperatures have been determined. In determining these characteristics, the initial data obtained during standard tests of laboratory samples under static loading (up to 30 samples) at room temperature were taken as the basis. The special aspects of distributions over some characteristics of general mechanical properties have been noted and a computational methodology for determining these characteristics at low temperatures is presented. The approaches to determination of probabilistic safety factors have also been considered. It is noted that an increase in the strength characteristics and the coefficient of operational loading with a decrease in temperature leads to a decrease in the safety factors with probability values of 1%. 1st International Conference on Integrity and Lifetime in Extreme Environment (ILEE-2019) Influence of temperature factor on probabilistic characteristics of main mechanical properties and safety factors N.A. Makhutov, V.V. Zatsarinnyy* Mechanical Engineering Research Institute named by A.A.Blagonravov, Ru sian Academy of Sciences, Maly Kharitonievsky per. 4, Moscow, 101990, Russia Abstract Eff ct of temperature factor on probabilisti characteristics of main mechanical properties and safety factors has been investigated; this effect should be take int account in the approach s when strength and lifetime f the structures w rking at low climatic temperatures under the conditions of Siberia and Extre e North ar c lculated. It is shown that in these conditions the main damaging factors for industrial facilities, equipment and main pipelines are low operating temperature, snow and ice loads. According to the data of experiment with using standard sp cimens and literature ata for steel 15H2NMFA and steel 3 c nducted by the proposed procedure the probabilistic ch racteristics of str ngth and plasticity u der the conditions of homogeneous stress state at both normal and negative temperatures have been determined. In deter ining these characteristics, th initial d ta obtained during standard tests of laborat ry samples under static loading (up to 30 samples) at room temperature were t ken as the basis. The special aspects of distributions over some characteristics of general mechanical properties have been not d a d a computational methodology for determining these characteristics at low temperatures is pres nted. The approaches to determination of pr babilistic s fety factors have also been considered. It is noted that an increase in the strength c aracteristics and the coefficient of operational loading with a decrease in temperature leads to a decrease in the safety factors with probability values of 1%.

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers

Keywords: Temperature factor; main mechanical properties; probability; distribution functions; negative temperatures; strength; safety factors Keywords: Temperature factor; main mechanical properties; probability; distribution functions; negative temperatures; strength; safety factors

* Corresponding author. Tel.: +7-916-169-75-69. E-mail address: v.zatsar@mail.ru * Correspon ing author. Tel.: +7-916-169-75-69. E-mail address: v.zatsar@mail.ru

2452-3216 © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers 2452 3216 © 2019 Th Author(s). Publis d by lsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers 10.1016/j.prostr.2019.12.117