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To optimize the mechanical performance of fused deposition modelling (FDM) fabricated parts, it is necessary to evaluate the influence of process parameters on the resulting mechanical performance. The main focus of the study was to characterize the influence of the initial process parameters on the mechanical performance of thermoplastic polyurethane under a quasi-static and high strain rate (~2500 s−1). The effects of infill percentage, layer height, and raster orientation on the mechanical properties of an FDM-fabricated part were evaluated. At a quasi-static rate of loading, layer height was found to be the most significant factor (36.5% enhancement in tensile strength). As the layer height of the sample increased from 0.1 to 0.4 mm, the resulting tensile strength sample was decreased by 36.5%. At a high-strain rate of loading, infill percentage was found to be the most critical factor influencing the mechanical strength of the sample (12.4% enhancement of compressive strength at 100% as compared to 80% infill). Furthermore, statistical analysis revealed the presence of significant interactions between the input parameters. Finally, using an artificial neural networking approach, we evaluated a regression model that related the process parameters (input factors) to the resulting strength of the samples.
Muhammad Salman Chaudhry; Aleksander Czekanski. Evaluating FDM Process Parameter Sensitive Mechanical Performance of Elastomers at Various Strain Rates of Loading. Materials 2020, 13, 3202 .
AMA StyleMuhammad Salman Chaudhry, Aleksander Czekanski. Evaluating FDM Process Parameter Sensitive Mechanical Performance of Elastomers at Various Strain Rates of Loading. Materials. 2020; 13 (14):3202.
Chicago/Turabian StyleMuhammad Salman Chaudhry; Aleksander Czekanski. 2020. "Evaluating FDM Process Parameter Sensitive Mechanical Performance of Elastomers at Various Strain Rates of Loading." Materials 13, no. 14: 3202.
The main aim of this research is to present complete methodological guidelines for dynamic characterization of elastomers when subjected to strain rates of 100/s–10,000/s. We consider the following three aspects: (i) the design of high strain rate testing apparatus, (ii) finite element analysis for the optimization of the experimental setup, and (iii) experimental parameters and validation for the response of an elastomeric specimen. To test low impedance soft materials, design of a modified Kolsky bar is discussed. Based on this design, the testing apparatus was constructed, validated, and optimized numerically using finite element methods. Furthermore, investigations on traditional pulse shaping techniques and a new design for pulse shaper are described. The effect of specimen geometry on the homogeneous deformation has been thoroughly accounted for. Using the optimized specimen geometry and pulse shaping technique, nitrile butadiene rubber was tested at different strain rates, and the experimental findings were compared to numerical predictions.
Muhammad Salman Chaudhry; Aleksander Czekanski. FE Analysis of Critical Testing Parameters in Kolsky Bar Experiments for Elastomers at High Strain Rate. Materials 2019, 12, 3817 .
AMA StyleMuhammad Salman Chaudhry, Aleksander Czekanski. FE Analysis of Critical Testing Parameters in Kolsky Bar Experiments for Elastomers at High Strain Rate. Materials. 2019; 12 (23):3817.
Chicago/Turabian StyleMuhammad Salman Chaudhry; Aleksander Czekanski. 2019. "FE Analysis of Critical Testing Parameters in Kolsky Bar Experiments for Elastomers at High Strain Rate." Materials 12, no. 23: 3817.