Cyclic behavior of unidirectional and cross-ply titanium matrix composites |
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| Affiliation: | 1. George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0405, U.S.A.;2. Aeronautics Option, California Institute of Technology, Pasadena, CA 91125, U.S.A.;3. Wright Laboratory Materials Directorate, WL/MLLN Bldg 655, Wright-Patterson AFB, OH 45433-7817, U.S.A.;1. School of Naval Architecture and Ocean Engineering, Harbin Institute of Technology, Weihai, No.2 West Wenhua Road, Weihai 264200, China;2. Shandong Institute of Shipbuilding Technology, Weihai, No.2 West Wenhua Road, Weihai 264200, China;1. TU Darmstadt, System Reliability and Machine Acoustics SzM, Magdalenenstrasse 4, 64289 Darmstadt;2. Fraunhofer Institute for Structural Durability and System Reliability, Bartningstrasse 47, 64289 Darmstadt;1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China;2. AECC Beijing Institute of Aeronautical Materials, Beijing, 81-15, 100095, China;3. State Key Laboratory of Superhard Materials, Department of Materials Science, Key Laboratory of Automobile Materials, MOE, Jilin University, Changchun, 130012, China;1. Institute of High Performance Computing, A1STAR, Singapore 138632, Singapore;2. FML, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China;3. School of Engineering, Brown University, Providence, RI 02912, USA |
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| Abstract: | Relatively simple and efficient micromechanical models are used to obtain the uniaxial response of SCS-6/Timetal 21S with [0]4 and [0/90]s laminates when subjected to isothermal and thermomechanical fatigue (TMF) loadings. Features of the modeling that are required to obtain the accurate deformation behavior for this class of materials under these loadings are highlighted. To this end, a comparison is made between the concentric cylinder model and the uniaxial stress model for representing the [0] laminate. The axial stresses from the two models are very similar under mechanical loading. The greatest differences appear under thermal loading alone. The differences on the composite response between a time-independent elastic-plastic and a viscoplastic matrix constitutive model are also examined. The latter is based on the Bodner-Partom unified constitutive model. The [0/90] laminate is treated by adding a parallel element with smeared [90] ply properties to the [0] model and invoking axial strain compatibility as well as stress equilibrium. The proposed constitutive law for the [90] ply includes both matrix viscoplasticity and fiber/matrix separation damage and is based on damage mechanics concepts. The effect of cyclic frequency on TMF behavior is examined. The in-phase TMF life is shown to be very sensitive to frequency due to the relaxation of matrix stress and the attendant increase in fiber stress. |
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