Enhancement of quasi-static compression strength for aluminum closed cell foam blocks shielded by aluminum tubes

Aluminum closed cell foam blocks are created with a volume of 1 inch³ which consist of aluminum foam parts shielded with part of aluminum tube and in some types reinforced with inner aluminum tubes. Blocks have been made to overcome some existing problems in metallic foam used to protect some applications parts from impacts as a sacrificial part. Metallic foam has three main categories sandwich panels, filled tubes and corrugated sheets. Quasi-static compression tests have been applied on 12 blocks with different shapes and compared with pure aluminum foam blocks as a reference. Results display the enhancement of mechanical properties of blocks like yield strength (S_Y), crushing strength (S_c) and densification strength (S_d), compression at strain 70%, as well as absorbed energy (area of compression under the curve). The highest value for yield strength (5.87 MPa) was registered for Finger phalanxes cube block (FP-0.1 Sq.). While the highest value for densification strength (21.7 MPa) was registered for spine cylinder block (SV8-0.17 C25). The registered results for samples apparent the highest value for energy dissipation density (E_dd) is 40.52 J/in³ (91% enhancement) and crushing strength (8.61 MPa) was registered for Finger phalanx cylinder block (FP-0.17 C25). The lowest value for E_dd is 14.16 J/in³ (less than pure aluminum foam block value by 33%), S_Y = 0.42 MPa, Sc = 3.21 MPa, and S_d = 4.46 MPa, registered for thin wall Ear canal cylinder block (EC8-0.075 C26.5). Best mechanical properties had been achieved for Finger phalanx cylinder block (FP-0.17 C25) and spine cylinder block (SV8-0.17 C25).