PSI - Issue 28

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 28 (2020) 1347–1359

© 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 European Structural Integrity Society (ESIS) ExCo Click here and insert your abstract text. © 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 European Structural Integrity Society (ESIS) ExCo Keywords: strain hardening; stress concentration; high speed loading; low temperature; stress triaxiality 1. Introduction The assessment of the local states of stresses and strains in the zones of stress and strain concentration is one of the key problems since fracture of technical system components as a rule, begins precisely in these zones. Moreover such an assessment should be made not only for normal loading conditions, causing elastic and limited elastoplastic strains under static and quasistatic loading but also for the cases of emergency dynamic application of loads when extensive plastic strains can occur at high strain rates. In this case it is necessary to take into account the influence of Ab tr ct Due to the fact that the process s of fracture of machine parts a d tructur l componen s usually ini iate in the zones of stress and strain concentrations, the problems of assessment of stres -stain response lim t states of th material in these zones become the most critical. The c pacity of the structural c mpone ts to sustain load and resist fracture depends on the strain rate and temperat res. O e s ould also take into consideration the increase of s ress triaxiality in the notch zones that caus local lasticity reduction and th increase of the yield stress value. The pproximate analytical approa h was developed to ad ress the problem ef ect of tres nd strain concentratio in a wide range of ap lied strains is described using a modified N ube equation. The influ nces of strain hardening and strain rate are described by power law equations. Temperature is accounted for using exponential relationships Click here and inse t your abstract text. © 2020 The Authors. Published by ELSEVIER B.V. This is an ope acces article under CC BY-NC-ND license (ht ps:// r ativecommons. rg/licenses/by-nc-nd/4.0) P er-review u de r spon ibility of the European Structural Integrity Society (ESIS) E Co Keywords: strain hardening; stress concentration; high speed loading; low temperature; stress triaxiality 1. Introduction The assess ent of the local states of stre ses and strains i the zones of stre s and strain conc ntration is one of the key proble s since fracture of technical system comp nents as a rule, begin precisely in these zones. M reover uch an ass ssment should be made not only for n rmal loading c nditions, causing elastic and limited elastoplastic strai under static d quasistatic loading but also for t e cases of emergenc dynamic application of loads when extensive plastic strains can occur at high strain rates. In this case it is necessary to take into account the influence of 1st Virtual European Conference on Fracture Effects of stress concentration and occurrence of limit states under high speed loading in low temperature operating conditions NikolayA. Makhutov a , Dmitry O.Reznikov a * a Mechanical Engineering Research Institute, 4 Maly Kharitonievsky lane, Moscow, 101990, Russia Abstract Due to the fact that the processes of fracture of machine parts and structural components usually initiate in the zones of stress and strain concentrations, the problems of assessment of stress-stain response and limit states of the material in these zones become the most critical. The capacity of the structural components to sustain load and resist fracture depends on the strain rate and temperatures. One should also take into consideration the increase of stress triaxiality in the notch zones that cause local plasticity reduction and the increase of the yield stress value. The approximate analytical approach was developed to address the problem. The effect of stress and strain concentration in a wide range of applied strains is described using a modified Neuber equation. The influences of strain hardening and strain rate are described by power law equations. Temperature is accounted for using exponential relationships 1st Virtual European Conference on Fracture Effects of stress concentration and occurrence of limit states under high speed loading in low temperature operating conditions NikolayA. Makhutov a , Dmitry O.Reznikov a * a Mechanical Engineering Research Institute, 4 Maly Kharitonievsky lane, Moscow, 101990, Russia

* Corresponding author. Tel.:+7 495 623 5835; fax:+7 495 623 58 35. E-mail address: mibsts@mail.ru * Correspon ing author. Tel.:+7 495 623 5835; fax:+7 495 623 58 35. E-mail address: mibsts@mail.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 responsibility of the European Structural Integrity Society (ESIS) ExCo 2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an ope acces article under CC BY-NC-ND license (ht ps:// r ativecommons. rg/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo

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 European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.10.106