The vertical impact of a wedge on a fluid

Servo-hydraulic System for Controlled Velocity Water Impact of Marine Sandwich Panels

“…The resulting formula had good agreement with the experimental work on scale models undertaken by Stavovy and Chuang [6,10]. Payne also compared the solution he had developed for maximum pressure [4] with Chuang's experimental results [8], showing good correlation. Both solutions had much better correlation with the experimental data than Wagner's solution for peak pressure [1], especially at lower deadrise angles.…”

“…9 are different by a factor closer to π/2 with an average difference of 37% to the experimental results. Figure 9 also shows that the peak pressures measured experimentally are higher than those predicted by Payne's own formulation [4]. While peak pressures are a commonly used parameter to compare different impact situations, they are actually very difficult to measure experimentally and there is limited agreement between theoretical predictions.…”

“…The higher pressures than Stavovy and Chuang may be related to improved measurement and acquisition devices used in current work, and also because the velocity in Chuang's original experiments was measured at the point of initial impact [7] and is hence likely to have reduced by the time that the pressure pulse reached the transducer. The variation between the experimental data and Wagner's solution [1] can in part be attributed to the simplifications made in the solution, as discussed by Payne [4] who states that Wagner used an incorrect wetted width of πy for a wedge, where 2y is the wetted width assuming no pile-up. He suggests that this gives results which are (π/2) 2 too large.…”

“…A modal transient Finite Element Analysis (FEA) simulation was compared with the experiments. The FEA simulation used a simplified pressure distribution with the maximum pressure calculated from Stavovy and Chuang's semi-empirical peak pressure formula [10], and the residual pressure based on scaled Payne's mean pressure calculations [4]. The rise and fall times were the only variables obtained from the experimental data.…”

“…Wagner [1] and von Karman [2] were two of the early researchers to use this approach. Since their initial developments several more analytical expressions for both peak pressure and pressure distribution have been developed by subsequent researchers [3][4][5]. Payne [4] produced a critical review of many of the modifications made to von Karman's [2] initial derivations.…”