Computational Simulation of Intermingled-Fiber Hybrid Composite Behavior

TITLE AND SUBTITLE:
Computational Simulation of Intermingled-Fiber Hybrid Composite Behavior

AUTHOR(S):
Subodh K. Mital and Christos C. Chamis

REPORT DATE:
March 1992

FUNDING NUMBERS:
WU-510-01-50

PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Lewis Research Center
Cleveland, Ohio 44135-3191

PERFORMING ORGANIZATION REPORT NUMBER:
E-7028

SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Washington, D.C. 20546-0001

REPORT TYPE AND DATES COVERED:
Technical Memorandum

SPONSORING/MONITORING AGENCY REPORT NUMBER:
NASA TM-105666

SUPPLEMENTARY NOTES:
Prepared for the 37th International SAMPE Symposium and Exhibition, Anaheim, California, March 9-12, 1992. Subodh K. Mital, University of Toledo, Toledo, Ohio, 43606; and Christos C. Chamis, NASA Lewis Research Center. Responsible person, S.K. Mital, (216) 433-3261.

ABSTRACT:
Three-dimensional finite-element analysis and a micromechanics based computer code ICAN (Integrated Composite Analyzer) are used to predict the composite properties and microstresses of a unidirectional graphite/epoxy primary composite with varying percentages of S-glass fibers used as hybridizing fibers at a total fiber volume ratio of 0.54. The three-dimensional finite-element model used in the analyses consists of a group of nine fibers, all unidirectional, in a three-by-three unit cell array. There is generally good agreement between the composite properties and microstresses obtained from both methods. The results indicate that the finite-element methods and the micromechanics equations embedded in the ICAN computer code can be used to obtain the properties of intermingled fiber hybrid composites needed for the analysis/design of hybrid composite structures. However, the finite-element model should be big enough to be able to simulate the conditions assumed in the micromechanics equations.

SUBJECT TERMS:
Composites; Hybrid; Finite elements; Composite properties; Micromechanics, Microstresses, Graphite fibers; S-glass fibers; Epoxy matrix

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