Experimental results and strength model identification of pure iridium

Scapin, Martina; Peroni, Lorenzo; Cabanilles, Constantino Torregrosa; Perillo‐Marcone, Antonio; Calviani, M.; Pereira, Laura Gomez; Léaux, F.; Meyer, M. S.

doi:10.1016/j.ijimpeng.2017.03.019

Cited by 20 publications

(12 citation statements)

References 24 publications

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“…The availability of material strength models at high strain rates (most of them obtained experimentally by Hopkinson bar tests [4]) is limited to regimes of relatively low temperatures, well below the 2000°C reached in the core. A dedicated dynamic characterization of pure iridium at high temperatures by using Hopkinson bar tests was carried out to extract the material models necessary for this project [5]. However, the maximum temperature reached in these tests was only 1250°C.…”

Section: Introductionmentioning

confidence: 99%

Experiment exposing refractory metals to impacts of 440 GeV/c proton beams for the future design of the CERN antiproton production target: Experiment design and online results

Martin

Perillo‐Marcone

Calviani

et al. 2019

Phys. Rev. Accel. Beams

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The HRMT27-RodTarg experiment employed the HiRadMat facility at CERN to impact intense 440 GeV proton beams onto thin rods 8 mm in diameter, 140 mm in length, and made of high-density materials such as Ir, W, Ta, Mo, and alloys. The purpose of the experiment was to reduce uncertainties on the CERN antiproton target material response and assess the material selection for its future redesign. The experiment was designed to recreate the extreme conditions reached in the production target, estimated in an increase of temperature above 2000°C in less than 0.5 μs and a subsequent compressive-to-tensile pressure wave of several gigapascals. The goals of the experiment were (i) to validate the hydrocode calculations used for the prediction of the antiproton target response and (ii) to identify limits and failure mechanisms of the materials of interest. In order to accomplish these objectives, the experiment relied on extensive instrumentation (pointing at the target rod surfaces). This paper presents a detailed description of the experiment as well as the recorded online results which showed that most of the investigated materials suffered internal damage from conditions 5-7 times below the ones present in the AD target. Tantalum, on the other hand, apparently withstood the most extreme conditions without presenting internal cracking.

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Section: Introductionmentioning

confidence: 99%

Experiment exposing refractory metals to impacts of 440 GeV/c proton beams for the future design of the CERN antiproton production target: Experiment design and online results

Martin

Perillo‐Marcone

Calviani

et al. 2019

Phys. Rev. Accel. Beams

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“…These numerical tools allow the implementation of advance material models, which take into account the material response beyond plastic deformation and even fracture. In this context, a dynamic characterization of Ir and W at high strain rates and temperatures was performed by means of Split‐Hopkinson Pressure bar tests . The parameters of the Johnson‐Cook strength model for these materials were extracted from these tests, to be used in the simulations.…”

Section: Previous Studies Leading To the Protad Designmentioning

confidence: 99%

“…In this context, a dynamic characterization of Ir and W at high strain rates and temperatures was performed by means of Split-Hopkinson Pressure bar tests. 6 The parameters of the Johnson-Cook strength model for these materials were extracted from these tests, to be used in the simulations. These numerical studies showed that a high-frequency radial mode is excited in the target core due to the sudden rise of temperature induced by each proton beam impact.…”

Section: Hydrocode Simulations Of the Dynamic Response Of The Targementioning

confidence: 99%

First prototypes of the new design of the CERN's antiproton production target

Torregrosa-Martin

Calviani

Solieri

et al. 2019

Mat Design Process Comm

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For antiproton production at CERN, high‐energy (26 GeV/c), intense, and short proton beams are impacted into a small rod—target core—made of a dense metal. Temperature rises in the order of 2000°C, and subsequent dynamic stresses of several gigapascals are induced in this rod every time it is impacted by the primary proton beam. Several R&D activities have been launched with the goal of proposing and manufacturing a new design of such device (named AD‐Target). A summary of these activities is presented, including the last design stage, which involves the manufacturing and testing of six real‐scale prototypes of the new target design. These prototypes (named PROTAD) consist of air‐cooled Ti‐6Al‐4V assemblies filled by matrices made of isostatic graphite or expanded graphite (EG), containing target cores made of small rods with different diameters (from 2 to 10 mm) of multiple grades of Ta, Ta2.5W, and Ir.

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“…This study, published in ref. [67], included analysis of different modes of fracture of Ir, its dynamic behavior at high temperature and strain rates, and strength model extraction.…”

Section: Iridiummentioning

confidence: 99%

“…A series of tests from room temperature up to 1200 • C and at different strain-rates were performed at DYNLab in order to obtain information about temperature and strain-rate sensitivity of iridium. The strain-rate sensitivity was investigated starting from 10 −3 s −1 up to 10 4 s −1 [67]. The medium-low strain rate tests were performed using an electro-mechanical testing machine.…”

Section: Extraction Of J-c Parameters Of Iridium By Dynamic Testingmentioning

confidence: 99%

Comprehensive Study and Optimized Redesign of the CERN's Antiproton Decelerator Target

Torregrosa-Martin¹,

Leopoldo²

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The Antiproton Decelerator Target (AD-Target) is a unique device responsible for the production of antiprotons at the European Organization for Nuclear Research (CERN). During operation, intense 26 GeV energy proton beams are impacted into its core, made of a 3 mm diameter rod of a high density material such as iridium, creating secondary particles-including antiprotons-from the nuclear reactions induced in its interior. This thesis delves into the characteristics of antiproton production and in particular in the mechanical response of the target core material, which is exposed to a rise of temperature of ∼ 2000 • C in less than 0.5 µs each time is impacted by the primary proton beam. A coupled numericalexperimental approach has been applied for this purpose. Finalmente, agradecer infinitamente a mi familia, primos y tíos. Y más que a nadie a mis padres y hermana, por su cariño y apoyo incondicional, ahora y siempre. Este doctorado es tan suyo como mío.

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Experimental results and strength model identification of pure iridium

Cited by 20 publications

References 24 publications

Experiment exposing refractory metals to impacts of 440 GeV/c proton beams for the future design of the CERN antiproton production target: Experiment design and online results

Experiment exposing refractory metals to impacts of 440 GeV/c proton beams for the future design of the CERN antiproton production target: Experiment design and online results

First prototypes of the new design of the CERN's antiproton production target

Comprehensive Study and Optimized Redesign of the CERN's Antiproton Decelerator Target

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