Failure of polymer coated nylon parts produced by additive manufacturing

M. Miguel, M. Leite, A. M. R. Ribeiro, A. M. Deus, Luis Reis, M. F. Vaz

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Fused deposition modelling (FDM) shows a great potential for the production of complex shapes in the case of several materials including nylon, which is a type of polyamide. In such materials, water absorption is an issue that requires attention and there is interest in studying the application of protective products, with the goal of improving the sealing properties of the parts. The objective of this work is to analyze and evaluate the water absorption, mechanical properties and consequent failure surfaces of nylon parts obtained by FDM, with two raster angles, after being coated with a protective material. Two polymeric products were used to coat the parts, polyurethane elastomer and silicone. The performance of the coated parts was evaluated with water absorption tests, as well as compression and tensile tests. The treatment was found to reduce the open porosity and to decrease the mechanical properties of the specimens in different raster angles. Failure occurs at surfaces making angles of zero or forty five degrees from the applied force, depending on the raster angle, both in treated and untreated samples.

Original languageEnglish
Pages (from-to)485-492
Number of pages8
JournalEngineering Failure Analysis
Publication statusPublished - 1 Jul 2019


  • Damage
  • Failure
  • Fused deposition modelling
  • Mechanical properties
  • Polymers


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