Accession Number : AD0465129


Title :   STRESS WAVES IN COMPOSITE LAMINATES


Corporate Author : ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN


Personal Author(s) : Kinslow, Ray


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/465129.pdf


Report Date : Jun 1965


Pagination or Media Count : 112


Abstract : Fractures caused by stress waves resulting from hypervelocity impact are sometimes reduced, and at other times are increased, by the use of laminated materials. An analysis of some of the parameters which affect the ability of a laminated structure to resist fracture following impact has been conducted. It is shown that there are multiple reflections from the interfaces bounding any layer of material. The amplitudes of these waves attenuate very rapidly, but because their transmitted components may combine in phase with other waves, they sometimes contribute substantially to the total stress produced. It is shown that these combined waves may result in a stress much greater in the laminated material than would have been produced by the same impact on a solid target of either of the materials used; however, under other conditions, the laminate may be employed to reduce the stress to a very small value. Pressure pulse amplitudes in materials having impedance mismatch values ranging from 0.1 to 10. 0 and having as many as thirty laminations are presented in both graphical and tabular form.


Descriptors :   *HYPERVELOCITY PROJECTILES , *LAMINATES , ALUMINUM , COMPOSITE MATERIALS , COPPER , FRACTURE(MECHANICS) , HYPERSONIC CHARACTERISTICS , MATERIALS , MATHEMATICAL ANALYSIS , POLYETHYLENE PLASTICS , PRESSURE , STRESSES , TARGETS , TERMINAL BALLISTICS , THICKNESS , WAVE PROPAGATION


Subject Categories : Laminates and Composite Materials
      Guns


Distribution Statement : APPROVED FOR PUBLIC RELEASE