Abstract
This paper presents a combined shear-compression impact test for soft cellular materials designed in order to investigate their behavior under impact multiaxial loadings. A large-diameter Nylon Split Hopkinson Pressure Bar system (SHPB) with beveled ends of different angles is used to apply the desired shear-compression combinations. The data processing methods are studied and validated by virtual testing data generated with FEM simulations. A series of experiments on an aluminum honeycomb were performed at the impact velocity of about 15 m/s with the loading angles ranging from 0° (corresponding to the pure compression) to 60°. It shows a strong effect of the additional shear loading because both the initial peak and the crush strength decrease with increasing loading angles. The quasi-static shear-compression experiments were also performed using the same beveled ends on a universal INSTRON machine and a notable strength enhancement under impact loading is observed. Images captured during quasi-static and impact tests permit for the determination of the two co-existing deforming patterns under combined shear-compression and reveal the influence of the loading rate on the occurrence of these two patterns.
| Original language | English |
|---|---|
| Pages (from-to) | 698-705 |
| Number of pages | 8 |
| Journal | International Journal of Solids and Structures |
| Volume | 48 |
| Issue number | 5 |
| DOIs | |
| State | Published - 1 Mar 2011 |
Keywords
- Combined shear-compression
- Dynamic strength enhancement
- Honeycombs
- Hopkinson bars