Development of 'Dropkinson' Bar for Intermediate Strain-rate Testing
| Autor: | Matthew A. Spletzer, Bo Song, Gary Groves, Brett Sanborn, Randy L. Everett, Marlene E. Knight, Kenney Dennis John, Jack D. Heister, Martinez Thomas L, Evan P. Johnson |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Physics QC1-999 media_common.quotation_subject Drop (liquid) Stress–strain curve 02 engineering and technology Split-Hopkinson pressure bar Strain rate 021001 nanoscience & nanotechnology Inertia Pulse shaping 020303 mechanical engineering & transports 0203 mechanical engineering Ultimate tensile strength Composite material 0210 nano-technology media_common |
| Zdroj: | EPJ Web of Conferences, Vol 183, p 02004 (2018) |
| ISSN: | 2100-014X |
| DOI: | 10.1051/epjconf/201818302004 |
| Popis: | A new apparatus – “Dropkinson Bar” – has been successfully developed for material property characterization at intermediate strain rates. This Dropkinson bar combines a drop table and a Hopkinson bar. The drop table is used to generate a relatively long and stable low-speed impact to the tensile specimen, whereas the Hopkinson bar principle is applied to measure the load history with accounting for inertia effects in the system. In addition, pulse shaping techniques were applied to the Dropkinson bar to facilitate uniform stress and strain as well as constant strain rate in the specimen. The Dropkinson bar was used to characterize 304L stainless steel and 6061-T6 aluminum at a strain rate of ~600 s−1. The experimental data obtained from the Dropkinson bar tests were compared with the data obtained from conventional Kolsky tensile bar tests of the same material at similar strain rates. Both sets of experimental results were consistent, showing the newly developed Dropkinson bar apparatus is reliable and repeatable. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|