This study undertakes an evaluation of blast impact effect through the analysis of the contribution rate and effect that different artificial joint number, artificial joint spacing, and artificial joint angle have on blast velocity and pressure. Blast velocity and pressure according to the different state of the artificial joint was obtained using AUTODYN, a dynamic analysis program. The result of the numerical analysis was subject to further normalization analysis. For the contribution rate of design factors was analyzed using the robust design method. The orthogonal array used in the analysis was L9(34), and the parameters were artificial joint number, artificial joint spacing and artificial joint angle for each parameter having 3 levels. The result of normalization analysis regarding the numerical analysis was indicated a tendency in which blast velocity decreased and blast pressure increased as joint angle increased. The result of analyzing blast pressure and velocity regarding joint spacing and joint angle was indicated a tendency in which blast velocity decreased as joint spacing increased when the angle was perpendicular and blast pressure was decreased as the more increasing joint spacing at the all joint angle parameters. The result of the contribution rate analysis using robust design was indicated that artificial joint angle had the largest effect on blast velocity, followed by artificial joint numbers and the artificial joint spacing. In the case of blast pressure contribution rates, they were ranked in the descending order of artificial joint angle, artificial joint numbers, and artificial joint spacing.
artificial joint, robust design, AUTODYN, blast velocity, blast pressure