Reverse Taylor Tests on Ultrafine Grained Copper
Abstract
Reverse Taylor impact tests have been carried out on ultrafine grained copper processed by Equal Channel Angular Pressing (ECAP). Tests were conducted on an as-received OFHC Cu rod and specimens that had undergone sequential ECAP passes (2 and 8). The average grain size ranged from 30 μm for the initial sample to less than 0.5 μm for the 8-pass samples. The dynamic deformation states of the samples, captured by high speed digital photography were compared with computer simulations run in AUTODYN-2D using the Johnson-Cook constitutive equation with constants obtained from stress-strain data and by fitting to an experimentally measured free surface velocity trace. The constitutive response of copper of varying grain sizes was obtained through quasistatic and dynamic mechanical tests and incorporation into constitutive models.
- Publication:
-
Shock Compression of Condensed Matter
- Pub Date:
- July 2006
- DOI:
- 10.1063/1.2263433
- Bibcode:
- 2006AIPC..845..757M
- Keywords:
-
- 81.70.Bt;
- 81.05.Bx;
- 62.20.Fe;
- Mechanical testing impact tests static and dynamic loads;
- Metals semimetals and alloys;
- Deformation and plasticity