Response surface methodological evaluation of drilling for the optimization of residual compressive strength of bio-based RPUF composite

• Published in: Materials research express 2019-12, Vol.6 (12), p.125372
• Main Authors: Agrawal, Anuja, Kaur, Raminder, Walia, R S
• Format: Article
• Language: English
• Subjects: castor oil; central composite design; drilling; residual compressive strength; rigid polyurethane foam
• ISSN: 2053-1591; 2053-1591
• DOI: 10.1088/2053-1591/ab5ea4

Present study investigates the impact of process parameters on the residual compressive strength of bio-based rigid polyurethane foam (RPUF) composites incorporated with copper powder. Formulation of the samples was optimized by performing compressive strength, thermo-gravimetric analysis (TGA) and flammability experiments. It was concluded that incorporation of 8% metallic filler showed up to 116% increase in the compressive strength and T5% was also found to increase from 192 °C to 257 °C. Furthermore, peak heat-release rate (PHRR) was found to decreased from 118 kW m−2 to 93 kW m−2 and total heat release (THR), smoke production rate (SPR) as well as total smoke release (TSR) also demonstrate a significant decrease on the incorporation of 8% copper powder in the RPUF. Polynomial mathematical model reliant on the Response surface method (RSM) employing Central composite design has been developed. It was concluded that density is the most influential factor for maximizing the residual compressive strength. The optimized process parameters for maximizing residual compressive strength were attained as high spindle speed and low feed rate. Furthermore, equations designated as the coded factors are also presented to identify the relative impact of factors.