PSI - Issue 28

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ScienceDirect

Procedia Structural Integrity 28 (2020) 1802–1807 Structural Integrity Procedia 00 (2020) 000–000 Structural Integrity Procedia 0 (2020) 000– 00

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

© 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 Abstract The paper presents the results of a study of the dynamic properties of 3M titanium alloy under tension, carried out using the Kolsky method, as well as the results of determining the spall strength obtained using a VISAR laser interferometer. The experiments using the split Hopkinson pressure bar were carried out in the range of strain rates of 700 - 1500 s − 1 . In this experiments, dynamic strain diagrams were obtained, according to which the yield strength σ 0 . 2 and the tensile strength were determined. The yield strength of the studied material increases with increasing strain rate from 700 MPa to 800 MPa. Since the 3M alloy does not experience hardening with increasing strain, fracture begins at stress close to yield strength. The tensile strength of this alloy under uniaxial tension (temporary tensile strength) also grows slightly from 700 MPa to 800 MPa with increasing strain rate. The ultimate plastic fracture characteristics of a titanium alloy (elongation and relative narrowing after rupture) are practically independent of the strain rate. In plane-wave experiments, spall strength was studied in the range of strain rates of 2 · 10 4 − 5 · 10 4 s − 1 . The obtained values of spall strength lie in the range of 1.6 - 4 GPa, which significantly exceeds the values obtained under static loading and the values obtained in experiments using the Kolsky method, which is apparently associated with both the influence of the strain rate and the influence volumetric stress state in a plane-wave experiment. 2020 The Authors. Published by Elsevier B.V. is is an open access article under the CC BY-NC-ND license (http: // creativec mmons.org / licenses / by-nc-nd / 4.0 / ) r-review unde responsibility of the European St uctural Integr ty Society (ESIS) ExCo. Keywords: strain rate; strength; titanium alloy; tension; experiment; dynamics; spall strength; plane-wave; fracture characteristics 1st Virtual European Conference on Fracture High-speed Deformation and Failure of Titan Alloy V.V. Balandin a , Vl.Vl. Balandin a , A.M. Bragov a, ∗ , A.Yu. Konstantinov a , A.V. Kuznetsov b , G.G. Savenkov c a Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, 603950, Russia b ”Armalit” Machine Building Plant, St. Petersburg, 198097, Russia c St. Petersburg State Technological Institute (Technical University), St. Petersburg, 190013, Russia Abstract The paper presents the results of a study of the dynamic properties of 3M titanium alloy under tension, carried out using the Kolsky method, as well as the results of determining the spall strength obtained using a VISAR laser interferometer. The experiments using the split Hopkinson pressure bar were carried out in the range of strain rates of 700 - 1500 s − 1 . In this experiments, dynamic strain diagrams were obtained, according to which the yield strength σ 0 . 2 and the tensile strength were determined. The yield strength of the studied material increases with increasing strain rate from 700 MPa to 800 MPa. Since the 3M alloy does not experience hardening with increasing strain, fracture begins at stress close to yield strength. The tensile strength of this alloy under uniaxial tension (temporary tensile strength) also grows slightly from 700 MPa to 800 MPa with increasing strain rate. The ultimate plastic fracture characteristics of a titanium alloy (elongation and relative narrowing after rupture) are practically independent of the strain rate. In plane-wave experiments, spall strength was studied in the range of strain rates of 2 · 10 4 − 5 · 10 4 s − 1 . The obtained values of spall strength lie in the range of 1.6 - 4 GPa, which significantly exceeds the values obtained under static loading and the values obtained in experiments using the Kolsky method, which is apparently associated with both the influence of the strain rate and the influence volumetric stress state in a plane-wave experiment. © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo. Keywords: strain rate; strength; titanium alloy; tension; experiment; dynamics; spall strength; plane-wave; fracture characteristics 1st Virtual European Conference on Fracture High-speed Deformation and Failure of Titan Alloy V.V. Balandin a , Vl.Vl. Balandin a , A.M. Bragov a, ∗ , A.Yu. Konstantinov a , A.V. Kuznetsov b , G.G. Savenkov c a Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, 603950, Russia b ”Armalit” Machine Building Plant, St. Petersburg, 198097, Russia c St. Petersburg State Technological Institute (Technical University), St. Petersburg, 190013, Russia

1. Introduction 1. Introduction

To calculate the strength of structures undergoing intense dynamic e ff ects, knowledge of the physical and mechan ical properties of structural materials in a wide range of strain rates is required. Currently, titanium alloys are one of the main structural materials used in various industries: aerospace, chemical, shipbuilding, etc. Their widespread use is associated with the complex of properties inherent in titanium and its alloys To calculate the strength of structures undergoing intense dynamic e ff ects, knowledge of the physical and mechan ical properties of structural materials in a wide range of strain rates is required. Currently, titanium alloys are one of the main structural materials used in various industries: aerospace, chemical, shipbuilding, etc. Their widespread use is associated with the complex of properties inherent in titanium and its alloys

∗ A.M. Bragov. Tel.: + 7-465-16-22. E-mail address: bragov@mech.unn.ru ∗ A.M. Bragov. Tel.: + 7-465-16-22. E-mail address: bragov@mech.unn.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 10.1016/j.prostr.2020.11.002 2210-7843 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo. 2210-7843 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo.