Accession Number : ADA508406


Title :   Durability of Composite Materials and Structures


Descriptive Note : Final technical rept. 7 Feb 2005-31 Jan 2009


Corporate Author : FLORIDA ATLANTIC UNIV BOCA RATON


Personal Author(s) : Granata, Richard D. ; Hartt, William ; Carlsson, Leif ; Mahfuz, Hassan ; Drzal, Lawrence ; Penumadu, Dayakar ; Clayton, Clive ; Scott, William


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA508406


Report Date : 02 NOV 2009


Pagination or Media Count : 15


Abstract : This project focused on marine composites and sandwich structures with specific interests on the effects of moisture, seawater, hydrostatic pressure, and temperature on their durability and life prediction. One task revealed fiber changes that occur with nitric acid treatment promoting better engineering design of composite fiber matrix interface and interphase region. Comparative environmental exposures show that moisture absorption was along the F/M interface (wicking). A fracture mechanical model of single fiber tests characterized the fiber matrix interface toughness as a parameter to monitor degradation and fiber matrix interface quality.


Descriptors :   *MATRIX MATERIALS , *COMPOSITE MATERIALS , *CARBON FIBERS , *STRUCTURES , INTERFACES , TOUGHNESS , FRACTURE(MECHANICS) , LIFE CYCLES , ABSORPTION , NITRIC ACID , MOISTURE , MARINE ENGINEERING , SEA WATER , SANDWICH CONSTRUCTION , MONITORING , PREDICTIONS , HYDROSTATIC PRESSURE , TEMPERATURE , DEGRADATION


Subject Categories : LAMINATES AND COMPOSITE MATERIALS
      STRUCTURAL ENGINEERING AND BUILDING TECHNOLOGY


Distribution Statement : APPROVED FOR PUBLIC RELEASE