PSI - Issue 47

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ScienceDirect

Procedia Structural Integrity 47 (2023) 268–273 Structural Integrity Procedia 00 (2023) 000–000 Structural Integrity Procedia 00 (2023) 000–000

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© 2023 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 IGF27 chairpersons Abstract In this paper, a commercial tungsten alloy is investigated in dynamic tensile tests with high strain rates and elevated temperatures on smooth and notched specimens. A Split Hopkinson Tensile Bar device, equipped with a water-cooled induction heating system, was used to perform the tests at high strain rates and elevated temperatures on round specimens measuring 2 mm in diameter and 5 mm in gauge. A series of tensile tests were conducted on specimens with three di ff erent notches at high strain rates and elevated temperatures to evaluate tensile behaviour in di ff erent triaxiality conditions. It has been found that the tensile properties of the tungsten alloy significantly depended on the test temperature and decreased with increasing temperature as well as stress triaxiality significantly a ff ects failure strain. Stress triaxiality, strain-rate sensitivity, and temperature were combined to study this alloy’s failure surfaces. © 2023 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 IGF27 chairpersons. Keywords: Tungsten alloy, Tensile test, Split Hopkinson Tensile Bar, Strain rate, Temperature, Triaxility. 27th International Conference on Fracture and Structural Integrity (IGF27) Combined e ff ects of high strain rate, elevated temperature, and triaxiality on a commercial tungsten alloy Ezio Cadoni a, ∗ , Matteo Dotta a , Daniele Forni a , Gianmario Riganti a a University of Applied Sciences and Arts of Southern Switzerland - DynaMat SUPSI Laboratory, Mendrisio 6850, Switzerland Abstract In this paper, a commercial tungsten alloy is investigated in dynamic tensile tests with high strain rates and elevated temperatures on smooth and notched specimens. A Split Hopkinson Tensile Bar device, equipped with a water-cooled induction heating system, was used to perform the tests at high strain rates and elevated temperatures on round specimens measuring 2 mm in diameter and 5 mm in gauge. A series of tensile tests were conducted on specimens with three di ff erent notches at high strain rates and elevated temperatures to evaluate tensile behaviour in di ff erent triaxiality conditions. It has been found that the tensile properties of the tungsten alloy significantly depended on the test temperature and decreased with increasing temperature as well as stress triaxiality significantly a ff ects failure strain. Stress triaxiality, strain-rate sensitivity, and temperature were combined to study this alloy’s failure surfaces. © 2023 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 IGF27 chairpersons. Keywords: Tungsten alloy, Tensile test, Split Hopkinson Tensile Bar, Strain rate, Temperature, Triaxility. 27th International Conference on Fracture and Structural Integrity (IGF27) Combined e ff ects of high strain rate, elevated temperature, and triaxiality on a commercial tungsten alloy Ezio Cadoni a, ∗ , Matteo Dotta a , Daniele Forni a , Gianmario Riganti a a University of Applied Sciences and Arts of Southern Switzerland - DynaMat SUPSI Laboratory, Mendrisio 6850, Switzerland Tungsten alloys are two-phase composite materials that combine tungsten and matrix properties. These materials feature outstanding physical properties, including high density, strength, hardness, corrosion resistance, thermal con ductivity, and wear resistance. There are many engineering applications for them, including aerospace and machining. The tensile properties of tungsten alloys are one of their most valuable properties. The aim of this preliminary study was to investigate the dynamic tensile behaviour of a commercial tungsten alloy when combined with high strain rates and elevated temperatures. This was done at di ff erent triaxialities. The tests were carried-out at high strain-rate (from 850 to 2200 1 / s) at room and elevated temperature (up to 1100 °C) by means of a Split Hopkinson Tensile Bar device, equipped with a water-cooled induction heating system, on round specimens having diameter and gauge length of 2mm and 5mm, respectively. In order to evaluate the tensile behaviour in di ff erent triaxiality conditions a series of tests at high strain rate and elevated temperature were carried out on specimens having three di ff erent notches. Tungsten alloys are two-phase composite materials that combine tungsten and matrix properties. These materials feature outstanding physical properties, including high density, strength, hardness, corrosion resistance, thermal con ductivity, and wear resistance. There are many engineering applications for them, including aerospace and machining. The tensile properties of tungsten alloys are one of their most valuable properties. The aim of this preliminary study was to investigate the dynamic tensile behaviour of a commercial tungsten alloy when combined with high strain rates and elevated temperatures. This was done at di ff erent triaxialities. The tests were carried-out at high strain-rate (from 850 to 2200 1 / s) at room and elevated temperature (up to 1100 °C) by means of a Split Hopkinson Tensile Bar device, equipped with a water-cooled induction heating system, on round specimens having diameter and gauge length of 2mm and 5mm, respectively. In order to evaluate the tensile behaviour in di ff erent triaxiality conditions a series of tests at high strain rate and elevated temperature were carried out on specimens having three di ff erent notches. 1. Introduction 1. Introduction

∗ Corresponding author. Tel.: + 41-58-666-6377. E-mail address: ezio.cadoni@supsi.ch ∗ Corresponding author. Tel.: + 41-58-666-6377. E-mail address: ezio.cadoni@supsi.ch

2452-3216 © 2023 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 IGF27 chairpersons 10.1016/j.prostr.2023.07.099 2210-7843 © 2023 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 IGF27 chairpersons. 2210-7843 © 2023 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 IGF27 chairpersons.