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Dynamic tensile necking: influence of specimen geometry and boundary conditions
This paper examines the effects of sample size and boundary conditions on the necking inception and development in dynamically stretched steel specimens. For that task, a coordinated systematic experimental&-numerical work on the dynamic tensile test has been conducted. Experiments were performed using a tensile Kolsky apparatus for impact velocities ranging from 10 to 40 m/s. Three different sample-gauge lengths &- 7, 30 and 50 mm &- were considered for which the cross section diameter is 3.4 mm. The experiments revealed that the specimens' ductility to fracture depends on strain rate and sample length. Furthermore it was observed that, for those specimens having gauge lengths of 30 and 50 mm, the necking location varies with impact velocity. Numerical simulations of the dynamic tensile tests were carried out in order to characterize the dynamics of neck inception and development. For each specimen calculated, three types of boundary conditions were used, all of which match the experimentally measured strain-rate. It was pointed out that, while boundary conditions hardly affect the calculated stress&-strain characteristics, they strongly affect the wave propagation dynamics in the specimen thus dictating the necking location. ; The researchers of the University Carlos III of Madridare indebted to the Comunidad Autónoma de Madrid (Project CCG10 UC3M/DPI 5596) and to the Ministerio de Ciencia e Innovación de España (Project DPI/2011 24068) for the financial support received which allowed conducting part of this work. D. Rittel acknowledges the support of Carlos III Univer sity with a Catedra de Excelencia funded by Banco Santan der during academic year 2011 2012.
Dynamic tensile necking: influence of specimen geometry and boundary conditions
This paper examines the effects of sample size and boundary conditions on the necking inception and development in dynamically stretched steel specimens. For that task, a coordinated systematic experimental&-numerical work on the dynamic tensile test has been conducted. Experiments were performed using a tensile Kolsky apparatus for impact velocities ranging from 10 to 40 m/s. Three different sample-gauge lengths &- 7, 30 and 50 mm &- were considered for which the cross section diameter is 3.4 mm. The experiments revealed that the specimens' ductility to fracture depends on strain rate and sample length. Furthermore it was observed that, for those specimens having gauge lengths of 30 and 50 mm, the necking location varies with impact velocity. Numerical simulations of the dynamic tensile tests were carried out in order to characterize the dynamics of neck inception and development. For each specimen calculated, three types of boundary conditions were used, all of which match the experimentally measured strain-rate. It was pointed out that, while boundary conditions hardly affect the calculated stress&-strain characteristics, they strongly affect the wave propagation dynamics in the specimen thus dictating the necking location. ; The researchers of the University Carlos III of Madridare indebted to the Comunidad Autónoma de Madrid (Project CCG10 UC3M/DPI 5596) and to the Ministerio de Ciencia e Innovación de España (Project DPI/2011 24068) for the financial support received which allowed conducting part of this work. D. Rittel acknowledges the support of Carlos III Univer sity with a Catedra de Excelencia funded by Banco Santan der during academic year 2011 2012.
Dynamic tensile necking: influence of specimen geometry and boundary conditions
Osovski, S. (author) / Rittel, D. (author) / Rodríguez-Martínez, José A. (author) / Zaera, Ramón (author)
2013-08-01
AR/0000013044
Article (Journal)
Electronic Resource
English
DDC:
690
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