Accession Number : ADA263748


Title :   A Uniaxial Nonlinear Viscoelastic Constitutive Model With Damage for M30 Gun Propellant


Descriptive Note : Final rept. Sep 1991-Jul 1992


Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD


Personal Author(s) : Gazonas, George A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a263748.pdf


Report Date : Apr 1993


Pagination or Media Count : 45


Abstract : The nonlinear viscoelastic mechanical response of a conventional tank gun propellant, M30, is modeled using a 'modified superposition integral' which incorporates the effects of microstructural fracture damage. Specifically, a linear, time-dependent kernel is convolved with the first-time derivative of a power-law function of stress and a damage 'softening' function which accounts for damage evolution by a microcrack growth mechanism. The microcrack damage function is a master curve formed from shifted isothermal, compressive, uniaxial constant strain rate (.01 1/s to 420 1/s) data on solid, right-circular cylinders of M30 gun propellant. An attractive feature of the model is its ability to predict work-softening behavior under conditions of monotonically increasing deformation. Time-dependent predictions of stress versus time, failure stress versus failure time, and failure stress versus strain rate, quantitatively agree with experimental results from constant strain rate tests on the propellant. Theoretical predictions of time-dependent stresses for Heaviside and ballistic-like strain histories are also provided.... Constitutive modeling, M30 Gun propellant, Continuum damage mechanics, Nonlinear viscoelasticity, Uniaxial compression testing, Viscoelasticity, Continuum mechanics.


Descriptors :   *GUN PROPELLANTS , BALLISTICS , BEHAVIOR , CIRCULAR , COMPRESSION , CONSTANTS , CONTINUUM MECHANICS , DAMAGE , DEFORMATION , FAILURE , FUNCTIONS , INTEGRALS , MECHANICS , MODELS , POWER , PREDICTIONS , PROPELLANTS , RATES , RESPONSE , SOFTENING , SOLIDS , STRAIN RATE , STRESSES , TANK GUNS , TEST AND EVALUATION , TIME , VISCOELASTICITY , WORK


Subject Categories : Ammunition and Explosives


Distribution Statement : APPROVED FOR PUBLIC RELEASE