Determination of Johnson Cook material parameters for ballistic impact simulation
2022-01-0424
03/29/2022
- Event
- Content
- Armour plates made up of high strength steels is used in fabrication of protective covers of armoured vehicles. The analysis of ballistic impact events and the response of armour plates is much useful for design improvements. Ballistic impact is a very complex event as it occurs in a very short period and is influenced by number of parameters. These parameters are difficult to be quantified and considered in FE analysis. Due to this, the physics of the event is not accurately captured in numerical simulation. Considering these parameters require extensive experimentation which incurs huge costs. Due to advances in the explicit finite element codes and material models, it is possible to determine these parameters by reducing the dependence on experiments. In this study, Johnson-Cook material and failure model parameters are determined for the target armour plate by performing a DOE study with minimal test data. Additionally, the effect of each of these material and failure model parameters on depth of penetration, bulge and width of penetration has also been studied. These parameters have also been validated with the test results. This study can be used to determine Johnson-Cook material and failure model parameters of a material with the need of only two data: stress-strain curve data available at nominal strain rate and room temperature and the test results. It thus reduces the need if stress-strain data at various strain rates and temperatures. These material parameters can then be used for further analyses and optimization studies.
- Citation
- Jain, P., and Bandgar, C., "Determination of Johnson Cook material parameters for ballistic impact simulation ," SAE Technical Paper 2022-01-0424, 2022, .