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Effect of Strain Rates and Heat Exposure on Polyamide (PA12) Processed via Selective Laser Sintering.

Chiara Morano¹, Marco Alfano², Leonardo Pagnotta¹

¹Department of Mechanical, Energy and Management Engineering, University of Calabria, 87036 Rende, Italy.

Materials (Basel, Switzerland)

|July 14, 2023

Summary

This study investigated how displacement rate and heat affect 3D-printed polyamide (PA12) mechanical properties. Selective laser sintering (SLS) produced parts, revealing rate dependency and partial influence of post-processing heat treatment on performance.

Keywords:

3D printing mechanical properties nylon polyamides strength thermal properties

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Area of Science:

Materials Science
Polymer Engineering
Additive Manufacturing

Background:

Polymers offer lightweight solutions for the transportation industry, reducing emissions.
Additive manufacturing (AM) enables complex geometries not possible with traditional methods.
Understanding 3D-printed polymer mechanical properties is vital for product performance and durability.

Purpose of the Study:

To investigate the influence of displacement rate and heat exposure on the mechanical characteristics of 3D-printed polyamide 12 (PA12).
To evaluate the thermal properties of PA12 powders and sintered materials.
To compare the properties of 3D-printed PA12 with its bulk counterpart.

Main Methods:

Selective Laser Sintering (SLS) was used to fabricate PA12 specimens.
Mechanical testing was performed at various displacement rates.
Differential Scanning Calorimetry (DSC) was employed to analyze thermal properties.
Post-processing heat treatment was applied to some specimens.

Main Results:

Mechanical properties of 3D-printed PA12 exhibited expected rate dependency.
Post-processing heat treatment demonstrated a partial influence on the mechanical behavior.
DSC analysis provided insights into the thermal characteristics of the material.

Conclusions:

The study confirms the rate-dependent nature of mechanical properties in 3D-printed PA12.
Post-processing heat treatment can modify, but does not fully alter, the mechanical performance.
Further research is needed to fully understand the microstructural changes affecting mechanical properties.