Accession Number:

ADA394328

Title:

Destruction of Isotropic and Anisotropic Materials at Impact - Wave Loading

Descriptive Note:

Final rept. Jun 2000-Jun 2001

Corporate Author:

RUSSIAN ACADEMY OF SCIENCES TOMSK DEPTFOR STRUCTURAL MACROKINETICS

Report Date:

2001-06-01

Pagination or Media Count:

39.0

Abstract:

Comparative analysis of behavior of anisotropic and isotropic materials at normal and oblique impact was conducted. Modeling of materials behavior was conducted in the framework of phenomenological approach by method of finite elements. To describe the failure of investigated materials was used tensor-polynomial criterion of the forth degree. The adequacy of the model used is tested by experimental investigation. Plates out of transtropic organoplastic were used as anisotropic samples. Isotropic samples are plates out of isotropic glass plastic. Impact loading of plates was realized with the use of compact steel cylinder. The comparison of results of numerical modeling and experimental data was made according to integral process parameters residual strikers velocity strikers deformation after punching of plates residual strikers length and profile of stress. In the framework of the phenomenological approach the influence of orientation of elastic and strength properties of the orthotropic material on fracture was investigated. The analysis of dynamics of interaction between the striker and plates showed qualitative differences in the evolution on failure of isotropic and anisotropic materials. This distinction is due not only to various values of strength parameters, but also to various velocities of propagation of shock wave and relief waves in anisotropic materials in different directions.

Subject Categories:

  • Laminates and Composite Materials
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE