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An experimental study of uniaxial fatigue behavior of an epoxy resin by a new noncontact real‐time strain measurement and control system
Author(s) -
Tao Gang,
Xia Zihui
Publication year - 2007
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.20754
Subject(s) - materials science , epoxy , composite material , modulus , strain (injury) , hysteresis , stress (linguistics) , cyclic stress , strain energy density function , stress–strain curve , strain energy , structural engineering , deformation (meteorology) , finite element method , medicine , linguistics , philosophy , physics , quantum mechanics , engineering
Uniaxial fatigue behavior of an epoxy resin was investigated with a recently established non‐contact real‐time strain measurement and control system. A relation of strain amplitude vs. fatigue life for fully‐reversed strain‐range‐controlled uniaxial fatigue tests was obtained. Quantitative analyses of evolutions of various mechanical properties (including stress range, elastic modulus, nonlinear stress‐strain relation, dissipated strain energy density, etc.) during entire fatigue life period were carried out based on recorded stress‐strain data. From the evolution of the stress‐strain hysteresis loops, a gradual degradation of modulus and a decrease of nonlinear effect in stress‐strain response were observed. It was also found that these two phenomena were independent of the loading control mode (stress‐control or strain‐range‐control) and the mean stress/strain values in the cyclic loading. Fractographic analysis was also performed and the mechanism of crack initiation and propagation of the epoxy material under cyclic loading was investigated. POLYM. ENG. SCI., 47:780–788, 2007. © 2007 Society of Plastics Engineers