Structure/Mechanical properties relations of melt processed PA12

Laser sintering allows producing end-use parts directly from CAD files with no tooling required; in order to use these parts in industrial applications, their intrinsic mechanical properties, as well as the long-term failure response must be investigated. The long-term response of thermoplastic is generally characterized by three failure regimes: a) plasticity controlled failure, b) slow crack growth and c) molecular degradation. The performances of regime a) and b) are strongly linked to the material microstructure, as determined processing history. Different processing conditions (heating/cooling rate and pressure) will be employed to vary the morphology (crystal phase, crystallinity, lamellae thickness) and establish how it influences the plasticity controlled, as well as crack-growth controlled failure. The differences between the intrinsic properties of melt-processed material and sintered material will be investigated.

Type of research: experimental