Investigation and Mechanical Modelling of Pure Molybdenum at High Strain-Rate and Temperature

被引：2

作者：

Scapin M. ^{[1
]}

Peroni L. ^{[1
]}

Carra F. ^{[1
,2
]}

机构：

[1] Department of Mechanical and Aerospace Engineering, Politecnico di Torino, Corso Duca degli Abruzzi, 24, Turin

[2] Engineering Department, Mechanical and Materials Engineering Group (EN-MME), Geneva 23

来源：

Journal of Dynamic Behavior of Materials | 2016年 / 2卷 / 04期

关键词：

FE-based numerical inverse approach; High strain-rate; High temperature; Hopkinson bar; Instability; Nuclear applications; Refractory metal; Tensile and compression;

D O I：

10.1007/s40870-016-0081-3

中图分类号：

学科分类号：

摘要：

This work shows the results obtained from the investigation of the mechanical behavior of two batches of pure molybdenum specimens (≥99.97 % Mo, Mo1 supplied by Plansee and Mo2 supplied by AT&M) under static and dynamic loading conditions at different temperatures, both under tensile and compressive loading conditions. Due to its properties molybdenum has applications in several fields including nuclear. At this moment, it is a good candidate for structural material application for Beam Intercepting Devices of the Large Hadron Collider at CERN, Geneva. The experimental tests in tensile loading condition were performed on small dog-bone specimens. A series of tests at room temperature and a range of strain-rates was performed in order to obtain information about the strain-rate sensitivity of the material. A series of tests at different temperatures in both static and high dynamic loading conditions was performed in order to obtain information about the thermal softening of the material. The dynamic tests were performed using the Hopkinson Bar technique, and the heating of the specimen was performed using an induction coil system. The experimental tests in compression were carried out on cylindrical specimens at room temperature and a range of strain-rates. The experimental data were analyzed via a numerical inverse method based on Finite Element numerical simulations. This approach allows to obtain the effective stress versus strain curves, which cannot be derived by using standard relations since instability and necking were present. Moreover, it also allows the non-uniform distribution of strain-rate and temperature inside the specimen to be accounted for. The results obtained from compression tests confirm the data obtained in tension in terms of strain-hardening and strain-rate sensitivity, even if the material exhibits a tension–compression asymmetry of the behavior. The analysis of the hardening, temperature and strain-rate sensitivities reveals that a unique standard visco-plastic model could not be defined to reproduce the material strength behavior under different loading conditions, especially over wide range of variation of the variables of interest. © 2016, Society for Experimental Mechanics, Inc.

引用

页码：460 / 475

页数：15

共 26 条

[1]

Bertarelli A., Et al., An experiment to test advanced materials impacted by intense proton pulses at CERN HiRadMat facility, Nucl Instrum Meth B, 308, pp. 88-99, (2013)

[2]

Dallocchio A., Bertarelli A., Arnau Izquierdo G., Artoos K., Advanced materials for future phase II LHC collimators, Proceedings of PAC09, Vancouver, (2009)

[3]

Nemat-Nasser S., Guo W., Liu M., Experimentally-based micromechanical modeling of dynamic response of molybdenum, Scripta Mater, 40, 7, pp. 859-872, (1999)

[4]

Chen C., Yin H., Humail I.S., Wang Y., Xuanhui Q., A comparative study of a back propagation artificial neural network and a Zerilli–Armstrong model for pure molybdenum during hot deformation, Int J Refract Metal Hard Mater, 25, pp. 411-416, (2007)

[5]

Xiao M., Li F., Xie H., Wang Y., Characterization of strengthening mechanism and hot deformation behavior of powder metallurgy molybdenum, Mater Des, 34, pp. 112-119, (2012)

[6]

Hollang L., Brunner D., Seeger A., Work hardening and flow stress of ultrapure molybdenum single crystals, Mater Sci Eng A, 319-321, pp. 233-236, (2001)

[7]

Meng B., Wan M., Xiangdong W., Zhou Y., Chang C., Constitutive modeling for high-temperature tensile deformation behavior of pure molybdenum considering strain effects, Int J Refract Metals Hard Mater, 45, pp. 41-47, (2014)

[8]

Li M., Eldrup M., Byun T.S., Hashimoto N., Snead L.L., Zinkle S.J., Low temperature neutron irradiation effects on microstructure and tensile properties of molybdenum, J Nucl Mater, 376, pp. 11-28, (2008)

[9]

Krishna S., De S., A temperature and rate-dependent micromechanical model of molybdenum under neutron irradiation, Mech Mater, 43, pp. 99-110, (2011)

[10]

Kleiser G.J., Revil-Baudard B., Cazacu O., Pasiliao C.L., Plastic deformation of polycrystalline molybdenum: experimental data and macroscopic model accounting for its anisotropy and tension–compression asymmetry, Int J Solids Struct, 75-76, pp. 287-298, (2015)

← 1 2 3 →