Simulation of Particle Size Effect on Dynamic Properties and Fracture of PTFE-W-Al Composites

Abstract

Recent investigations of the dynamic compressive strength of cold isostatically pressed composites of polytetrafluoroethylene (PTFE), tungsten (W) and aluminum (Al) powders show significant differences depending on the size of metallic particles. The addition of W increases the density and overall strength of the sample. To investigate relatively large deformations multi-material Eulerian and arbitrary Lagrangian-Eulerian methods, which have the ability to efficiently handle the formation of free surfaces, were used. The calculations indicate that the increased strength of the sample with fine metallic particles is due to the formation of force chains under dynamic loading. This phenomenon occurs even at larger porosity of the PTFE matrix in comparison with samples with larger particle size of W and higher density of the PTFE matrix.

arXiv comment5 pages, 6 figures

Cited by in corpus (3)

• Particle size effect on strength, failure and shock behavior in Polytetrafluoroethylene-Al-W granular composites
• The influence of metallic particle size on the mechanical properties of PTFE-Al-W powder composites
• Role of material properties and mesostructure on dynamic deformation and shear instability in Al-W granular composites