An inverse approach for the identification of the time-dependent localized interaction pressure between a structure and an explosive has been proposed and developed. In this approach, surface measurements of structural response (displacement and velocity) are integrated with numerical simulations to identify the spatial and time-dependent interaction pressure (i.e. the normal traction) on a structure surface. For verification and validation purposes, numerical simulations are used to (a) generate the time-dependent displacement and velocity fields on the free surface of the specimen at specified time intervals, (b) form a blast wave and compute the resulting interaction traction field between the structure and blast wave on the interaction interface for comparison to inverse predictions. In particular, validation of the proposed approach was performed using numerical simulation results for an underwater explosion, with excellent agreement between the identified interaction traction and the simulation generated interaction traction up to and including the maximum traction condition. To demonstrate the potential of the method, the proposed inverse procedure was employed to estimate the interaction traction field on a thin aluminum specimen subjected to transient pressure loading through detonation of explosive buried in sand.
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All experiments were performed in the Dynamic Effects Laboratory of Prof. William L. Fourney at the University of Maryland, College Park, MD with the support of Dr. Uli Leiste and his staff.
Central difference is used to convert displacement measurements into velocity estimates at time t + Δt/2.
Heat generation is not considered in this study.
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The authors would like to thank ARO and Dr. Bruce LaMattina for the support of this work through ARO Grant # W911NF-06-1-0216
An erratum to this article can be found at http://dx.doi.org/10.1007/s11340-011-9474-3
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Xu, S., Tiwari, V., Deng, X. et al. Identification of Interaction Pressure Between Structure and Explosive with Inverse Approach. Exp Mech 51, 815–830 (2011). https://doi.org/10.1007/s11340-010-9390-y
- Structure-explosive interaction
- Inverse analysis
- Pressure identification
- Iterated extended Kalman filter
- Numerical modeling