Accession Number : ADA319784

Title :   Structural Composite Penetration Model Development.

Descriptive Note : Final rept. 20 Mar 95-6 Feb 96,

Corporate Author : PHILLIPS LAB KIRTLAND AFB NM

Personal Author(s) : Chen, Jinn-Kuen ; Allahdadi, Firooz A.

PDF Url : ADA319784

Report Date : OCT 1996

Pagination or Media Count : 55

Abstract : The smoothed particle hydrodynamics (SPH) technique in conjunction with the macromechanics concept for fiber composites was developed to simulate impact penetration of composite structures. To describe the material behavior under high intensity loadings, a three dimensional anisotropic plasticity model, an equation of state, and a failure criterion for unidirectional composites were proposed. Furthermore, to maintain material frame indifference of the constitutive equations, the polar stress rate approach was employed in the stress and strain transformation under large rotation. The above physics were incorporated into SPH. Detailed penetration process and damage progression were simulated with graphite/epoxy composite laminates impacted by a steel projectile. The predicted impact response and damage patterns agree well qualitatively with the experimental results. This study has demonstrated that SPH can be a robust and viable analytical tool for predicting response of fiber reinforced composite structures subjected to high velocity impact.

Descriptors :   *MATHEMATICAL MODELS, *LAMINATES, *COMPOSITE STRUCTURES, *PENETRATION, *PLASTIC PROPERTIES, STRESSES, POLAR REGIONS, IMPACT, COMPOSITE MATERIALS, PROJECTILES, HIGH VELOCITY, DAMAGE ASSESSMENT, FIBER REINFORCED COMPOSITES, NUMERICAL ANALYSIS, RATES, STEEL, THREE DIMENSIONAL, PARTICLES, PHYSICS, RESPONSE, ANISOTROPY, HIGH INTENSITY, ROTATION, HYDRODYNAMICS, EQUATIONS OF STATE, UNIDIRECTIONAL.

Subject Categories : Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE