| Abstract [eng] |
In this research study, a 3D-printed piezoresistive load sensor was developed. Using SolidWorks modelling software, a piezoresistive load sensor consisting of multi-layered polymeric components, conductive (serpentine structure), and biocompatible substrate materials were modelled. The CAD models were converted to STL files, and those files were sliced using PrusaSlicer to generate g-codes for the Prusa i3 MK3 3D printer. The current study is intended to fill the research gap in order to overcome the difficulties associated with measuring mechanical strength, such as shear, tear, etc. After numerous trials and errors, printing failures, and testing hurdles, a novel shear test procedure using UTM was developed to evaluate interlayer bonding between sensor components. As per the shear testing methodology, the most suitable temperature during printing to obtain greater interlayer bonding was around 230 °C. Subsequently, the multi-material load sensors were redesigned, 3D printed, and tested using UTM. The results for parallel load show an exponential increase in internal resistance from 120 k-ohm to 1.8 M-ohm when an external force of 0-70 N is applied. On the basis of the experimental results, a suitable circuit with E-CAD was proposed for signal processing of the load sensor. Finally, a concise explanation and evaluation of the cost required for the economical production of the piezoresistive load sensors using a standard single-extrusion 3D printer were provided. |
