Empirical Model for Energy Required to Puncture Specimens of 7075-T651 Aluminum Bar
- Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Specimens of 7075-T651 aluminum with different thicknesses were punctured by AISI 4340 steel probes of various shapes and sizes in a series of drop-table experiments. The times when a probe contacts a specimen and when it breaks through are indicated by the acceleration of the drop-table carriage. The change in the total energy of the carriage between these times is the energy mitigated by each specimen. Only a few replications were performed with each specimen thickness, probe shape, and probe diameter, so the data sets are not amenable to classical statistical inference. Rather than calculate statistics for each combination of geometric parameters, an empirical model is derived that uniquely fits the data for each probe shape. The model predicts future observations within the range of specimen thicknesses and probe diameters that were tested. Confidence intervals based on the variance in the data account for uncertainty. The lower bounds on the mitigated energy for a few select scenarios are tabulated below.
- Research Organization:
- Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- DOE Contract Number:
- NA0003525
- OSTI ID:
- 2585599
- Report Number(s):
- SAND--2025-08271R; 1775343
- Country of Publication:
- United States
- Language:
- English
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