Impact Dynamics of the M557 Fuze
Abstract
This report outlines the results of a combined experimental and computational study that investigates the transient structural response of the M557 point detonating fuze subjected to low speed (200 m/s) oblique impact by a hardened steel projectile. The problem is of interest to the explosive ordnance disposal (EOD) community as it is a method that is currently used to render safe ordnance and other explosive devices found in the field. An inert M557 fuze is instrumented with a low mass (1.5 gram) 60 kilo g uniaxial accelerometer and subjected to oblique impact by launching a 300 gram projectile from a 4 in airgun. The transient structural response of the fuze is compared to the predicted response using the Lagrangian finite element code DYNA3D. Peak accelerations measured in two tests average 35 kilo g, whereas DYNA3D predicts a 40 to 50 kilo g peak acceleration depending upon the amount of prescribed damping. Both measured and computed acceleration histories are Fourier transformed, and the estimated spectral response at the base of the fuze is shown to be dependent upon the failure strength of the flash tube.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1998
- Accession Number
- ADA349031
Entities
People
- George A. Gazonas
Organizations
- United States Army Research Laboratory