Deformation and fracture of nano-sized metal-coated polymer particles: A molecular dynamics study
Journal article, Peer reviewed
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Original versionEngineering Fracture Mechanics. 2015, 150 209-221. 10.1016/j.engfracmech.2015.08.028
The mechanical behavior of Ni-coated polyethylene (PE) nanoparticles subjected to compression loading is systemically investigated by classical molecular dynamics simulation. Results show that the Ni coatings on PE nanoparticles lead to a densification of particle surface and remarkably enhance the compression strength. The particle size-effect and the coating thickness effect on the compression responses in terms of compressive strength and particle burst are observed. Burst of Ni-coated PE nanoparticles initiates at the high stress-concentrated grain-boundaries zone of polycrystalline Ni-shell, and propagates along the compression direction to the flattened contact surface, resulting in release of core PE molecules.