AWJM Performance of jute/polyester composite using MOORA and analytical models

This work addresses the machinability performance of jute/polyester composites with variable laminate thickness using Abrasive water jet machining (AWJM) process. A hybrid objective function was developed using surface roughness (R-a) and kerf taper angle (T-a) and studied using a cost-effective Multi Objective Optimization by Ratio Analysis named as MOORA. The influence of machining parameters such as hydraulic pressure (P), feed rate (V-f) and standoff distance (S-d) on quality characteristics were considered for this analysis. Among all, V-f was found to be a strong influencing factor on T-a and R-a. The deviation in the magnitude of T-a and R-a was observed in the case of varying laminate thicknesses without affecting the optimum condition. Besides, a mathematical regression model was developed for both T-a and R-a based on the correlation between the dependent variables. Furthermore, two other models of R-a available in the literature were considered for comparison with experimental results. The results revealed the suitability of these models for the polymer-based fiber-reinforced composite materials, but limited to the maximum thickness of 3 mm. The good agreement of the models with two different sets of experimental values was also found.