RESEARCH ON COMPRESSIVE BEHAVIOR OF A WILLOW STRUCTURE MANUFACTURED USING FDM TECHNOLOGY

Alexandru-Eugen DIACONESCU, Sebastian-Marian ZAHARIA, Mihai Alin POP, Gheorghe OANCEA

Abstract


In the context of industrial product remanufacturing, internal structures can be optimized beyond those automatically generated by slicing software, through innovative geometries. This study investigates the compressive behavior of a Willow structure proposed by Snapp et al, which demonstrated a mechanical energy absorption efficiency coefficient of KS=75.2%. To rigorously evaluate the potential of this geometry as an infill in applications requiring high energy absorption capacity and low weight, it is necessary to assess the influence of the material on the performance of the Willow structure. The structure was manufactured using the FFF/FDM technology with a 0.6 mm nozzle and three different materials: PLA, PETG, and carbon fiber-reinforced PET (PET CF15). The aim of the paper is to offer to the readers a comparative study on comprehensive behavior of Willow structure manufactured using FDM technology and the selected materials. Standardized tests on cylindrical specimens, according to ASTM D695, revealed the superior material performance of PET CF15. However, in the case of Willow structure with thin walls, material performance rankings changed due to the tendency of PET CF15 layers to slide and delaminate under load, caused by the random orientation of carbon fibers. Specimens were microscopically analyzed both before and after compression testing to identify material defects and failure modes. This study highlights the influence of carbon fibers on the performance of Willow structures and proposes future research directions. 


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References


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