Wonder of Science
ABSTRACT
This paper describes numerical simulation of a selected soft missile impact small scale test. The main aim of the testing program is to provide data for the calibration and verification of the numerical simulation models for soft missile impact time-history simulation. The experiments are conducted both with dry and fluid filled missiles. The objective of the tests with fluid filled missiles is to investigate the release speed and the droplet size of the fluid spray release in the impact. The spray release velocity and droplet size are needed as an input data for numerical simulation methods to assess the spread of the liquid in the impact. The second object of the testing program is to develop the numerical methods for predicting the response of reinforced concrete structures to impacts of soft missiles. The pre-test and post-test analyses are used for simulating the impact load time-history and structural behavior of both the missile and the target with the aid non-linear finite element method.
INTRODUCTION
The events of September 11th have emphasized the need to design protective structures for important constructions against external impact loads, caused e.g. by colliding vehicles, and to analyze carefully the possible consequences of such events, taking into account the existing experience and information. In the open literature there are some fairly well documented test results on the subject of deformable missiles to be used as references in developing and calibrating the finite element simulation models and assessing the obtained numerical results. However, test results for fluid filled soft projectiles are not available in the open literature. In order to get any confidence with the simulation results, experimental, recorded data is needed for verification. The main objective of the small scale test program is to develop and calibrate finite element simulation models for reinforced concrete structures impacted by deformable missiles filled
This paper describes numerical simulation of a selected soft missile impact small scale test. The main aim of the testing program is to provide data for the calibration and verification of the numerical simulation models for soft missile impact time-history simulation. The experiments are conducted both with dry and fluid filled missiles. The objective of the tests with fluid filled missiles is to investigate the release speed and the droplet size of the fluid spray release in the impact. The spray release velocity and droplet size are needed as an input data for numerical simulation methods to assess the spread of the liquid in the impact. The second object of the testing program is to develop the numerical methods for predicting the response of reinforced concrete structures to impacts of soft missiles. The pre-test and post-test analyses are used for simulating the impact load time-history and structural behavior of both the missile and the target with the aid non-linear finite element method.
INTRODUCTION
The events of September 11th have emphasized the need to design protective structures for important constructions against external impact loads, caused e.g. by colliding vehicles, and to analyze carefully the possible consequences of such events, taking into account the existing experience and information. In the open literature there are some fairly well documented test results on the subject of deformable missiles to be used as references in developing and calibrating the finite element simulation models and assessing the obtained numerical results. However, test results for fluid filled soft projectiles are not available in the open literature. In order to get any confidence with the simulation results, experimental, recorded data is needed for verification. The main objective of the small scale test program is to develop and calibrate finite element simulation models for reinforced concrete structures impacted by deformable missiles filled
References: Riera, J. On the stress analysis of structures subjected to Aicraft impact forces. Nuclear Engineering and Design, 8, 1968, 41.5-426. Johnson, W., Impact Strength of Materials. Edward Arnold Ltd, London 1972, 361 p. Hakola, Ilkka, Kärnä, Tuomo: IMPACT TESTs Testing Facility. SAFIR Report December 2005. 6 1 Transactions, SMiRT 19, Toronto, August 2007 Transactions, SMiRT 19, Toronto, August 2007 . Paper # ???? Paper # J08/1 ABAQUS/EXPLICIT, User 's manual, Abaqus Inc.,2004. MSC/DYTRAN, User 's manual, MSC Software Corp., 2004. 7 1