Abstract
A model was developed for the Head Injury Criterion (HIC) as a function of two operational testing variables and five trim manufacturing variables utilizing an incomplete block design. An analysis of variance and residual were conducted. Minitab? was utilized to evaluate the main effects on HIC. The significant variables were the dummy head drop calibration (HC), and the dummy head approach angle (Oa). However, packing pressure and injection speed had slight effects on HIC. Since the variables interaction effects were not significant on the analysis of the estimated coefficients, a new mathematical model was developed to include only the significant variables (HIC = 8.48614x107 Hc ?2.2577 Oa 0.35173). An optimization of HIC was conducted. The Hybrid III dummy head provides a more robust tool with respect to HIC measurements, and it is suitable for approach angles 5 to 20 degrees.