Large fracture toughness boron-epoxy compositesThe high tensile strengths of strong interfacial bonding may be combined with the large fracture toughness of weak interfacial bonding in brittle fiber/brittle matrix composites by intermittently coating the filaments before layup so as to have random alternate weak and strong regions. Appropriate coating materials enable Cook-Gordon Mode I interfacial debonding to take place, which produces very long pull-out lengths with an associated large contribution to toughness. Unidirectional boron-epoxy composites have been so made which have toughnesses greater than 200 kJ/sq m while retaining rule of mixtures tensile strengths. Similar trends have been observed for crossply layups.
Document ID
19750048589
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Atkins, A. G. (Michigan, University Ann Arbor, Mich., United States)
Date Acquired
August 8, 2013
Publication Date
May 1, 1975
Subject Category
Composite Materials
Report/Patent Number
AIAA PAPER 75-773
Meeting Information
Meeting: AIAA, ASME, and SAE, Structures, Structural Dynamics, and Materials Conference