2025-04-09 09:00:00
Planetary defense test mission by NASA have used the philosophy of Kinetic impactor in its DART (Double Asteroid Redirection Test) mission. The primary concept in these hypervelocity impact events lies in impacting an asteroid (target) with a spacecraft (projectile) such that ejecta produced from…
Magnesium alloys have received much attention because of their high specific strength as well as recent advances in manufacturing processes. They have been applied in light-weight consumer electronics such as laptops and smartphone, and are being considered for automobile and aerospace applications. However, magnesium…
Split Hopkinson Pressure bar experiments were performed with Modified Shear Compression Specimens (Dorogoy et al. 2015). The samples were 3D manufactured by Selective Laser Melting out of two different porous metallic materials: aluminium alloy AlSi10Mg and stainless steel 316L. Moreover, high-speed high-resolution in-situ radiography,…
The syntactic foam, a porous solid consisting of randomly distributed microballons in the polymeric matrix, is increasingly being conceived for aero engine applications to enhance overall structural reliability under impact loading. Systematic compressive tests without and with lateral confinement are carried out to investigate…
Granular materials are composed of many discrete, disconnected solid particles that come together to form a porous aggregate. These types of materials are ubiquitous in both natural and industrial settings, where they frequently interact with fluids in their local environments. Understanding and modeling these…
Tantalum is a body-centered-cubic (BCC) metal that is widely used in many industrial applications. In some of these applications, the material is subjected to extensive volumetric expansion, leading to ductile damage and failure. Therefore, understanding dynamic ductile damage behavior is particularly important. In order…
Ductile fracture of metals involves nucleation, growth, and coalescence of voids. Starting from the pioneering work of Gurson, there have been constitutive models developed from first principles to characterize the growth and coalescence of voids. A new theory of multisurface plasticity accounts for homogeneous…
This work investigates the effect of porous microstructure on the necking formability of ductile sheets subjected to dynamic in-plane stretching. We have developed an original approach in which finite element calculations which include actual void distributions obtained from additively manufactured materials are compared with…
This experimental campaign presents a new experimental setup to study dynamic fragmentation of metallic rings manufactured by 3D-printing technology. The ring is inserted over a ductile thin-walled tube which is impacted axially by a conical nosed cylindrical projectile fired by a single-stage light-gas gun….
Metallic cellular materials, such as lattices and honeycombs, are of interest in the design of lightweight blast and impact-resistant structures. Additive Manufacturing (AM) has enabled the fabrication of complex metallic cellular materials due to the additional design freedom AM provides. This extends the available…
