Abstract
The reliability assessment of the projectile-borne components in a high-speed penetrator is an important issue in the penetration field. In this study, a scaling model embedded with a deceleration measurement device was used to investigate the overloading situation due to the high cost of the prototype test. The projectile could be scaled, while the deceleration measurement device needs to maintain full scale. Thus, a nonproportional scaling design is proposed to represent the rigid-body deceleration of the prototype projectile. This study, considering the mass of the deceleration measurement device, lays out the design criteria of the scaling model and carries out rigid-body deceleration similarity verification tests of the prototype and the scaling model. In addition, the rigid-body deceleration similarity was examined through model predictions and numerical simulation. These results show that the rigid-body deceleration of the nonproportional scaling model is generally in agreement with that of the prototype for penetrating the semi-infinite concrete target. The deviations of rigid-body deceleration magnitude and duration are 6.76% and −12.1%, respectively. This makes it reasonable and feasible to investigate the overloading situation of prototype projectile through a nonproportional scaling model.
Highlights
IntroductionTo reduce the high cost from prototype experiments, the scaling model projectile with projectile-borne measurement device has become an important method to investigate and predict the overloading situation of prototype projectile
In the design of the scaling model, the projectile is scaled down, while the measurement device needs to remain full scale. e abovementioned issue does not fit the condition of complete similitude. us, we need to consider the nonproportional scaling method, so that the overloading situation of the model can accurately represent that of the prototype projectile
Guo et al [7] studied the force transmission process based on the revised SHPB (Split Hopkinson pressure bar) and proposed that the structural response of composite structure consisted of three terms, namely, structural vibration, forced vibration, and shock response
Summary
To reduce the high cost from prototype experiments, the scaling model projectile with projectile-borne measurement device has become an important method to investigate and predict the overloading situation of prototype projectile. Us, we need to consider the nonproportional scaling method, so that the overloading situation of the model can accurately represent that of the prototype projectile. It is generally accepted that the penetration overloading consists of rigid-body deceleration, structural response of. The rigid-body deceleration is considered as the input condition to investigate the structural response of the system. Li and Chen [11, 12] defined two dimensionless numbers, the impact function and the projectile geometry function, based on the similitude analysis and concrete penetration model.
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