PSI - Issue 30

Available online at www.sciencedirect.com Available online at www.sciencedirect.com Sci nceD rect Structural Integrity Procedia 00 (2020) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2020) 000–000

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ScienceDirect

Procedia Structural Integrity 30 (2020) 193–200

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the EURASTRENCOLD - 2020 guest editors Abstract To solve urgent problems of ensuring the vehicles parts reliability under alternating loads, it is necessary to study the influence of operational conditions on the accumulation of fatigue damage in the material, leading to the appearance of micro- and macrocracks. The purpose of this work is to study the influence of fatigue damage formed in spring steel under operational impacts typical of the cryolithozone on the level of its resistance to brittle fracture. Methods of mathematical statistics and methods of metal research (metallography, fractography, microindentation, mechanical testing, etc.) were used in the work. Two main types of structural damage are identified, differing in scale level: microdamage, reflected by the microhardness parameter, and mesodamages in the form of pores of various diameters. New data on poorly studied fatigue damage accumulation processes under non-stationary loading and their influence on brittle fracture resistance were obtained. Mechanism of the effect of porosity on brittle fracture resistance is associated with the occurrence of deformation processes in the vicinity of pores, as well as during growth and coalescence of pores. The research results can be used to develop methods for obtaining and information processing on the structural damage of materials and to extend the service life of elastic elements of vehicles operating in the cryolithozone. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the EURASTRENCOLD - 2020 guest editors Keywords: spring steel; structural damage; fatigue failure; impact toughness; fracture micromechanisms. IX Eurasian Symposium on the problems of strength and resource in low climatic temperatures (EURASTRENCOLD-2020) Fatigue damage, impact toughness and micromechanisms of fracture of spring steel after operation at low climatic temperatures Yakovleva S. P. a, *, Buslaeva I. I. b , Makharova S. N. a , Levin A. I. b a Larionov Institute of Physical-Techincal Problems of the North SB RAS, 1 Oktyabrskaya Stre t, Yakutsk, 677980, Russia b Siberian Branch of the Russian Academy of Sciences, Yak t Scientific Centre, 2 Petrovskogo Street, Yakutsk, 677000, Russia Abstract To solve urgent problems of ensuring the vehicles parts reliability under alternating loads, it is necessary to study the influence of operational conditions on the accumulation of fatigue d mage in the material, leading to the ppearance of micro- and mac ocracks. The purpose of this work is to study the influenc of fatigue damage formed in spring steel under ope ational i pacts typical of the cryolithozone on the level of its resistance to brittl fractur . Methods of mathematical statistics a d methods of metal resear h (metall graphy, fractography, microindentation, m ch nical testing, etc.) were used n the work. Two ain types of structur l damage are identified, differing in s ale l vel: microdamage, reflected by the microhardness pa ameter, and mesodamages in the form of pores of various diameters. New data on po rly studied fatigue damage a cumulation p ocess s u er non-stationary loading and their in luence on brittl fracture resistance were obtained. M ch nism of the effect of p ro ity o brittle frac ure resist nce is associated with the occurr nce of deform tion processes i the vi inity of pores, as well as during growth and coal sc nce of pore . The researc r sults can b use t develop method for obta n g and inform tion process on the structur damag materials and to extend the servic lif of elastic ele nts of vehicles oper ting in the cryolith zone. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der r sponsibility of EURASTRE COLD - 2020 guest ed tors K ywords: spring steel; structural damage; fatigue failure; impact toughness; fractur micromechanisms. IX Eurasian Symposium on the problems of strength and resource in low climatic temperatures (EURASTRENCOLD-2020) Fatigue damage, impact toughness and micromechanisms of fracture of spring steel after operation at low climatic temperatures Yakovleva S. P. a, *, Buslaeva I. I. b , Makharova S. N. a , Levin A. I. b a Larionov Institute of Physical-Techincal Problems of the North SB RAS, 1 Oktyabrskaya Street, Yakutsk, 677980, Russia b Siberian Branch of the Russian Academy of Sciences, Yakut Scientific Centre, 2 Petrovskogo Street, Yakutsk, 677000, Russia

* Corresponding author. Tel.: +8-411-239-0577. E-mail address: spyakovleva@yandex.ru * Corresponding author. Tel.: +8-411-239-0577. E-mail address: spyakovleva@yandex.ru

2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open-access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of the EURASTRENCOLD - 2020 guest editors 2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open-access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der the responsibility of the EURASTRENCOLD - 2020 gu st editors

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the EURASTRENCOLD - 2020 guest editors 10.1016/j.prostr.2020.12.030