Numerical and experimental investigation of the effect of delamination defect at materials of polyethylene terephthalate (PET) produced by additive manufacturing on flexural resistance

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Doğru A., Sözen A., Neşer G., Seydibeyoğlu M. Ö.

International Journal of 3D Printing Technologies and Digital Industry, cilt.6, sa.3, ss.382-391, 2022 (TRDizin)

Özet

Polyethylene terephthalate (PET) material, universally used in the packaging industry due to its thermal and mechanical properties, high chemical resistance, and low gas permeability, is among the most widely used polymer materials worldwide. These properties have made their use in additive manufacturing methods widespread. Determining how some common additive manufacturing defects affect the products produced by these methods will increase the adoption of these technologies in final production. In this study, the effect of layer non-joining defect called delamination on the impact strength of PET material produced by additive manufacturing method at different layer thicknesses was carried out experimentally and numerically. The effects of flexural stress on the artificially created layer adhesion defect on the middle layers of the parts produced and modelled with a layer thickness of 0.1/0.2/0.3 mm were investigated. It has been discovered that the increase in layer thickness decreases flexural strength. In addition, while the flexural strength of the specimens containing delamination decreased, the growth in layer thickness accelerated this decrease.