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#17597, Temperature Effect on Ductile Damage of AA2024-T351 at High Strain Rates and Pressures using Rod-on-Rod Test

Recently, several authors demonstrated the importance of shear effect on fracture strain for many classes of metals and alloys, such as AA2024-T351. For stress states such as torsion, the fracture strain of this alloy is lower than that of uniaxial tensile condition. For these material classes, ductile damage is dependent on triaxial stress and influenced by the third stress deviator invariant.
In this study, the Rod-on-Rod test was used to assess the role of temperature on the shear sensitivity of AA2024-T351 at high strain rates and pressures. Using a single-stage light-gas gun, the tests were performed in vacuum at different impact velocities and temperatures, starting from room temperature. Selected recovered samples were observed using SEM, showing a reduction of the shear damage mechanisms with increasing temperature. The Plasticity Damage Self Consistent (PDSC) model, proposed by Bonora and Testa, was used to evaluate the weight of triaxiality and the third invariant on the ductile damage of the selected tests.

Gianluca Iannitti   University of Cassino and Southern Lazio
Nicola Bonora   University of Cassino and Southern Lazio
Antonio Maffucci   University of Cassino and Southern Lazio
Alberto Pagano   University of Cassino and Southern Lazio
Andrew Ruggiero   University of Cassino and Southern Lazio
Gabriel Testa   University of Cassino and Southern Lazio
Sara Ricci   University of Cassino and Southern Lazio