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Title: Evaluation of empirical and analytical procedures used for predicting the rigid body motion of an earth penetrator
Authors: United States. Defense Nuclear Agency.
Hadala, Paul F.
Keywords: Earth penetrators
Impact shock
Aerial projectiles
Rigid body motion
Soil penetration
Soil mechanics
Mathematical models
Numerical models
Publisher: Soils and Pavements Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Miscellaneous Paper (U.S. Army Engineer Waterways Experiment Station) ; S-75-15
Description: Miscellaneous Paper
Abstract: This report presents a comparison of five pretest predictions with the measured rigid body motion of a large penetrator normally impacting the Watching Hill Blast Range at the Defence Research Establishment, Suffield, Ralston, Alberta, Canada, at an impact velocity of about 500 ft/sec. The prediction methods used were evaluated in detail. They included the Sandia empirical penetration formulas, the spherical and cylindrical cavity expansion theories, a viscoplastic force "law," and the AVCO differential area force "law." The capability of predicting peak rigid body deceleration and maximum penetration within a factor of two of measured test data was demonstrated by several of the methods. However, none of the five prediction methods proved to be completely satisfactory or to be so superior to the others that it could be recommended for exclusive use in predicting earth penetrating weapon (EPW) response. In the report, the pros and cons of each method are discussed. The results of the study are used as a basis for recommendations for future research on EPW rigid body loadings and trajectories.
Gov't Doc #: Miscellaneous Paper S-75-15
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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