Accession Number : ADA257544


Title :   A Numerical Study of Dynamic Crack Propagation in Composites


Descriptive Note : Master's thesis


Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA


Personal Author(s) : Babiloglu, Erol


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a257544.pdf


Report Date : Sep 1992


Pagination or Media Count : 78


Abstract : A numerical study was performed to investigate the dynamic crack propagation in fibrous composite plates utilizing the finite element method. A rectangular plate of uniform thickness, which had a propagation central crack, was used for the study. The plate was unidirectional composite panel and the load was applied in the longitudinal direction of the composite plate. Fracture energies were calculated for given speeds of cracks. The objective of the study was to examine the effect of different composite material properties, crack speeds, and densities on the fracture energy. The discontinuous node-release technique was used to model the crack propagation. The numerical study showed that the fracture energy was higher for a lower elastic modulus ratio, if all other conditions were held the same. Furthermore, a lower crack propagation velocity or a lower material density resulted in a higher fracture energy, respectively, provided the rest of the parameters held constant. Dynamic fracture of composites.


Descriptors :   *COMPOSITE MATERIALS , *COMPOSITE STRUCTURES , *CRACK PROPAGATION , *PLATES , VELOCITY , DENSITY , RATIOS , PANELS , CRACKS , MODULUS OF ELASTICITY , NODES , UNIDIRECTIONAL , DYNAMIC LOADS , CONSTANTS , FRACTURE(MECHANICS) , THESES , ENERGY , STIFFNESS , FINITE ELEMENT ANALYSIS , THICKNESS , MODELS


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


Distribution Statement : APPROVED FOR PUBLIC RELEASE