Multiaxial failure characterization of composites
The primary objective of this research has been to develop a multiaxial testing capability for continuous fiber composites using the axial/torsion/internal pressurization of tubes. This capability enables one to generate the two-dimensional (in-plane) failure surface for these materials. The multiaxial test specimen consists of a 5.08 cm (2.0 in.) diameter composite tube with 15{degrees} cast epoxy end cones for gripping. The unique advancement with this new technique is the simple, but very efficient, gripping mechanism that provides a very smooth transition in load from the grip into the specimen. This has eliminated grip related stress risers in the composite tube. Consequently, most of the failures occur in the gage section of the tube. This system is coupled into a biaxial MTS servo hydraulic test machine capable of simultaneously applying axial load, torque, and internal pressure, providing one complete control of the axial, transverse, and shear stresses that develop in the wall of the composite tube. This paper will present the failure results obtained to date for various laminate configurations of Toray 1000/DER332-T403 filament wound carbon/epoxy tubes along with T300/F263 prepreg carbon/epoxy tubes. The goal of our efforts is to develop a more fully characterized three-dimensional failure criterion for these materials. This model will then be incorporated into a large three-dimensional orthotropic finite element model for structural analysis as well as a specialized three-dimensional orthotropic finite element model capable of detailed sub-ply level analysis on sub-structural components. 19 refs., 10 figs.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5883391
- Report Number(s):
- UCRL-JC-105244-Rev.1; CONF-910731-2-Rev.1; ON: DE91011925
- Resource Relation:
- Conference: 8. international conference on composite materials, Honolulu, HI (USA), 15-19 Jul 1991
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
COMPOSITE MATERIALS
MATERIALS TESTING
COMPRESSION
EPOXIDES
FAILURES
FIBERS
GRAPHITE
STRESSES
TORSION
CARBON
ELEMENTAL MINERALS
ELEMENTS
MATERIALS
MINERALS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
TESTING
360603* - Materials- Properties
420500 - Engineering- Materials Testing