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Superior Energy Dissipation by Ultrathin Semicrystalline Polymer Films Under Supersonic Microprojectile Impacts

Submitted by Ramathasan The… on
research
impact
polymer
thinfilms
Energy absorption
dynamic behavior
ballistics

Distinct deformation mechanisms that emerge in nanoscale enable the nanostructured materials to exhibit outstanding specific mechanical properties. Here, we present superior microstructure- and strain-rate-dependent specific penetration energy (up to ∼3.8 MJ/kg) in semicrystalline poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) thin films subjected to high-velocity (100 m/s to 1 km/s) microprojectile (diameter: 9.2 μm) impacts.

When to use equation of state models for modeling hydrodynamic response in metals?

Submitted by rctron on
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Ask iMechanica
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ballistics
equation of state
3D dynamic simulation
hypervelocity impact

Equation of state models (Mie-Gruneisen equation of state etc) have been widely used to study hydrodynamic response of material during explosive deformation, ballistic impacts for a long time. As far as I understand, a hydrodynamic response is required to be incorporated in a model if the pressure of impact leads to an increase volumetric strength. That is the stress wave speed in the material exceeds the speed of sound in the material (v = sqrt(elastic modulus/density)).  Ballistic impacts occur at strain rates close to 10^9 to 10^12/s.

call for abstracts - Composite Armor and Ballistic Impact/Failure Dynamics

Submitted by drgaurav on
conference
impact
failure
damage
Composites
FEA
terminal ballistics
armor
ballistics

Dear colleagues,



I am organizing sessions related to “Composite Armor” and “Impact Dynamics” at the following conferences in 2014. I would like to personally invite you and your research group to submit an abstract.



The Composites and Advanced Materials Expo (CAMX) (ACMA/SAMPE)

Abstract submission deadline: Feb 7, 2014

Session Title: Composite Armor



American Society for Composites (ASC) 29th Technical Conference

Abstract submission deadline: Feb 1, 2014

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