Accession Number : ADA259979


Title :   Damage Processes in a Quasi-Isotropic Composite Short Beam Under Three- Point Loading


Descriptive Note : Journal article


Corporate Author : PHILLIPS LAB KIRTLAND AFB NM


Personal Author(s) : Fortson, Bryan H ; Armanios, Erian A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a259979.pdf


Report Date : Jan 1992


Pagination or Media Count : 11


Abstract : Composite materials have complex failure models that include delamination, fiber debonding and breakage, and matrix microcracking. The influence of these damage models on the failure of the short-beam three-point bend test is investigated for a composite with a quasi-isotropic layup. Failure is found to initiate in a region near the point of application of the load, a location where classical-type analytical descriptions of specimen behavior are unreliable. Furthermore, the locations of failure show little reproducibility. Observed fracture behavior is explained in terms of the overall stress state of the beam before fracture, and failure is predicted from the stress map, using the maximum strain criterion.


Descriptors :   *COMPOSITE MATERIALS , *BEAMS(STRUCTURAL) , *FIBER REINFORCED COMPOSITES , LOAD DISTRIBUTION , PREDICTIONS , STRAIN(MECHANICS) , FRACTOGRAPHY , NUMERICAL METHODS AND PROCEDURES , DELAMINATION , MICROCRACKING , SHEAR TESTS , SHEAR STRENGTH , FAILURE(MECHANICS) , STRUCTURAL RESPONSE , FRACTURE(MECHANICS) , FINITE ELEMENT ANALYSIS , STRESS TESTING , LAMINATES , MODELS


Subject Categories : Laminates and Composite Materials
      Structural Engineering and Building Technology


Distribution Statement : APPROVED FOR PUBLIC RELEASE