Accession Number : ADA301553

Title :   Crack Propagation Modes in Injection Molded Fiber Reinforced Thermoplastics,

Descriptive Note : Research rept.,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF MATERIALS SCIENCE AND ENGINEERIN G

Personal Author(s) : Mandell, J. F. ; Huang, D. D. ; McGarry, F. J.

PDF Url : ADA301553

Report Date : APR 1980

Pagination or Media Count : 37

Abstract : The modes of crack propagation are reported for injection molded short glass and carbon fiber reinforced thermoplastics. The matrices ranged from ductile to brittle, including Nylon 66, polycarbonate, polysulfone, poly(amide-imide), and polyphenylene sulfide; fiber contents were 30 or 40 % by weight. The main crack is found to grow in a fiber avoidance mode, bypassing regions of agglomeration of locally aligned fibers. The local mode of crack tip advance varied with matrix ductility and bond strength. The fracture toughness and fatigue resistance of each material are related to the mode of crack growth.

Descriptors :   *FIBER REINFORCED COMPOSITES, *CRACK PROPAGATION, *THERMOPLASTIC RESINS, *INJECTION MOLDING, POLYMERS, RESISTANCE, CRACKS, CARBON FIBERS, TOUGHNESS, GLASS, STRENGTH(MECHANICS), FRACTURE(MECHANICS), BRITTLENESS, BONDING, FATIGUE(MECHANICS), DUCTILITY, AMIDES, AVOIDANCE, POLYCARBONATES, SULFIDES, IMIDES, POLYPHENYLENES, AGGLOMERATES, POLYSULFONES.

Subject Categories : Plastics
      Polymer Chemistry
      Mechanics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE