2021-04-07 08:00:00
Kinetic Impactors are one of the most mature technologies available to mitigate a potential asteroid impact with the Earth, but predicting the asteroid’s response to a kinetic impactor requires the use of large-scale numerical simulations. As we learn more about the asteroid population from…
The integrative model “integrates” various mechanisms at the continuum level which can possibly be developed within the target material subjected to projectile impact. The possible mechanisms that can be developed within the material include evolution of the initial cracks which has been modeled based…
We have been conducting hypervelocity impact tests and numerical simulations in order to create Japanese design guidelines that protect satellites against a certain degree of impact by micrometeoroids and orbital debris (hereinafter referred to as M/OD). Certain members of JAXA, university researchers, computer analysts,…
Space debris impacts at hypervelocity of several tens of km/s threaten the survival of space structures. In the case of International Space Station, the concept of Whipple shield is applied to protect the astronauts and the electronic devices from impact of space debris. In…
The experimental investigation of high strain rate fragmentation has generally been limited to one of two cases: analytically powerful but simple one-dimensional loading configurations, or complicated multiaxial experiments more closely approximating use applications. The former, exemplified by Mott style ring fragmentation, promotes simple and…
The validation of computational models for ultra-high strain rate material response and failure is critically important for developing materials and systems that operate in extreme environments. Hypervelocity impact (HVI) experimentation provides the ability to produce the ultra-high strain rate responses of interest. However, in-situ…
Understanding the dynamic behavior of materials under high-velocity impact is very important to design impact-resistant materials. Both target and projectile materials undergo severe loading that can cause large deformations, fragmentation, melting, and vaporization. Many prior studies focus on impact phenomena that can be visualized…
NASA’s Double Asteroid Redirection Test (DART) mission is the first planetary defense mission to directly test asteroid deflection by kinetic impactor. The DART mission will launch in summer 2021, and the impact in the 65803 Didymos binary asteroid system will occur in late September-early…
Impacts of small objects regularly occur on the Moon, and have been observed to produce a characteristic optical flash upon impact. These impacts typically occur at hypervelocity (>10 km/s), and usually involve impactors less than ten meters in diameter. The details of the impact…
Molecular dynamics simulations of plate-impact experiments were conducted to study shock propagation in boron carbide along two crystal orientations corresponding to the highest and lowest elastic moduli. While an elastic precursor wave was observed along both orientations upon shock loading, high intensity shocks also…
